作者： Ouyang, Shuai;Xiang, Wenhua*;Wang, Xiangping;Xiao, Wenfa;Chen, Liang;...

期刊： Journal of Ecology,2019年107(5):2266-2277 ISSN：0022-0477

通讯作者： Xiang, Wenhua

作者机构： [Chen, Liang; Xiang, Wenhua; Ouyang, Shuai; Lei, Pifeng; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.;[Chen, Liang; Xiang, Wenhua; Ouyang, Shuai; Lei, Pifeng; Deng, Xiangwen] Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong, Peoples R China.;[Wang, Xiangping; Sun, Han] Beijing Forestry Univ, Coll Forestry, Beijing, Peoples R China.;[Zeng, Lixiong; Xiao, Wenfa] Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, State Forestry Adm, Key Lab Forest Ecol & Environm, Beijing, Peoples R China.;[Li, Shenggong] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing, Peoples R China.

通讯机构： [Xiang, Wenhua] C;[Xiang, Wenhua] H;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.;Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong, Peoples R China.

关键词： biodiversity and ecosystem functioning;complementarity effect;environmental conditions;functional diversity;phylogenetic diversity;selection effect;subtropical forests

摘要： Forest productivity may be determined not only by biodiversity but also by environmental factors and stand structure attributes. However, the relative importance of these factors in determining productivity is still controversial for subtropical forests. Based on a large dataset from 600 permanent forest inventory plots across subtropical China, we examined the relationship between biodiversity and forest productivity and tested whether stand structural attributes (stand density in terms of trees per ha, age and tree size) and environmental factors (climate and site conditions) had larger effects on productivity. Furthermore, we quantified the relative importance of environmental factors, stand structure and diversity in determining forest productivity. Diversity, together with stand structure and site conditions, regulated the variability in forest productivity. The relationship between diversity and forest productivity did not vary along environmental gradients. Stand density and age were more important modulators of forest productivity than diversity. Synthesis. Diversity had significant and positive effects on productivity in species-rich subtropical forests, but the effects of stand density and age were also important. Our work highlights that while biodiversity conservation is often important, the regulation of stand structure can be even more important to maintain high productivity in subtropical forests. © 2019 The Authors. Journal of Ecology © 2019 British Ecological Society

语种： 英文

作者： Huang, Yaqi;Deng, Xiangwen*;Zhao, Zhonghui;Xiang, Wenhua;Yan, Wende;...

期刊： Forests,2019年10(9):ARTN 757 ISSN：1999-4907

通讯作者： Deng, Xiangwen

作者机构： [Huang, Yaqi; Deng, Xiangwen; Zhao, Zhonghui; Xiang, Wenhua; Yan, Wende; Ouyang, Shuai; Lei, Pifeng] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China;[Deng, Xiangwen; Zhao, Zhonghui; Xiang, Wenhua; Yan, Wende; Ouyang, Shuai; Lei, Pifeng] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China;[Deng, Xiangwen; Zhao, Zhonghui; Xiang, Wenhua; Yan, Wende; Ouyang, Shuai; Lei, Pifeng] Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha 410004, Hunan, Peoples R China

通讯机构： [Deng, Xiangwen] C;[Deng, Xiangwen] H;[Deng, Xiangwen] N;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China. Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China. Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha 410004, Hunan, Peoples R China.

关键词： climate change;double peaks;Gompertz model;manual band dendrometer;radial growth;subtropical area

摘要： Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) is the most commonly grown afforestation species in subtropical China. It is essential that we understand the response of radial tree growth to climate factors, yet most experiments have been conducted based on total annual growth and not on monthly dynamics, which alone can detail the influence of climatic factors. In this study, we aimed to: (i) construct a monthly growth model and compare the growth rate of different social statuses of trees, and (ii) determine the response of radial increments of different social statuses to climate factors. The radial growth was monitored monthly during four years using manual band dendrometers (MBD). The data were fitted using the Gompertz function. Within-stand differences in the social status of Chinese firs resulted in growing period and growth rate length variations. The radial growth began in March, and suppressed trees-especially groups of AS1 and BS1 (suppressed trees of classes I in sites A and B)-stopped in September, whereas dominant and intermediate trees were delayed and stopped in November. The periodic monthly increment curve showed double peaks, and the maximum growth rate occurred in April and August. The peak values were affected by social status, which showed that dominant trees had the greatest radial growth rates. S-shaped Gompertz meant that monthly increment models were successfully fitted to our data, which explained more than 98% of the variation in increment data and passed the uncertainty test. Temperature and precipitation had a significant influence on radial growth, and the correlation between radial growth and air temperature was the highest. Our results also revealed that temperatures explain the double-peak features of Chinese fir. The limiting factors of radial growth changed with the seasons and were mainly affected by temperature and precipitation, which should be considered in predicting the response of tree growth to climate change. © 2019 by the authors.

语种： 英文

作者： Li, Quan;Song, Xinzhang*;Chang, Scott X.;Peng, Changhui;Xiao, Wenfa;...

期刊： Agricultural and Forest Meteorology,2019年268:48-54 ISSN：0168-1923

通讯作者： Song, Xinzhang

作者机构： [Li, Quan; Li, Yan; Zhang, Junbo; Song, Xinzhang] Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Zhejiang, Peoples R China.;[Chang, Scott X.] Univ Alberta, Dept Renewable Resources, Edmonton, AB T6G 2E3, Canada.;[Peng, Changhui] Univ Quebec Montreal, Dept Biol Sci, Inst Environm Sci, Case Postale 8888,Succursale Ctr Ville, Montreal, PQ H3C 3P8, Canada.;[Xiao, Wenfa] Chinese Acad Forestry, Res Inst Forest Ecol Environm & Protect, State Forestry Adm, Key Lab Forest Ecol & Environm, Beijing 100091, Peoples R China.;[Xiang, Wenhua] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Song, Xinzhang] Z;Zhejiang A&F Univ, State Key Lab Subtrop Silviculture, Hangzhou 311300, Zhejiang, Peoples R China.

关键词： Carbon cycle;Nitrogen addition;Q 10;Soil CO 2 efflux

摘要： Nitrogen (N) deposition plays an important role in regulating forest productivity and microbial biomass and activities, ultimately influencing soil respiration (Rs). However, the effects of increasing atmospheric N depositions on Rs in subtropical Moso bamboo forests remain poorly understood. Here, we conducted a 4-year field experiment in a subtropical Moso bamboo forest to quantify the effect of simulated N depositions at four rates (0, 30, 60 and 90 kg N ha −1 yr -1 ) on Rs. The mean Rs rate of the control was 353.17 ± 53.23 mg CO 2 m -2 h -1 or 30.75 ± 2.38 t CO 2 ha -1 yr -1 . Soil respiration showed significantly higher sensitivity (Q 10 ) to soil temperature than to air temperature, and the Rs rate was significantly positively related to soil microbial biomass carbon, soil temperature, and NO 3 -. In response to N addition treatments of 30, 60, and 90 kg N ha -1 yr -1 , the mean annual Rs increased by approximately 45.7%, 37.7%, and 13.0%, respectively, compared with the control. Nitrogen depositions decreased the temperature sensitivity of Rs, leading to predictions that they may be able to mitigate the priming effects of future climate warmings on Rs in Moso bamboo forests in the coming decades. Combined models based on the significant relationships between Rs rates, daily mean air temperatures, and hourly soil temperatures at a depth of 5 cm may reliably and feasibly estimate annual soil CO 2 efflux. On average, soil emitted 470 kg CO 2 ha -1 yr -1 per 1 kg N ha -1 yr -1 added, which declined when N addition surpassed the N saturation threshold of 60 kg N ha -1 yr -1 . Our findings provide a method for estimating annual soil CO 2 efflux and new insights into the effects of N deposition rates on soil CO 2 efflux in Moso bamboo forests. © 2019

语种： 英文

作者： 蒋迎红;刘雄盛;蒋燚;何应会;项文化

期刊： 广西植物,2018年38(7):843-850 ISSN：1000-3142

作者机构： 中南林业科技大学生命科学与技术学院, 长沙, 410004;广西壮族自治区林业厅保护处, 南宁, 530028;广西壮族自治区林业科学研究院, 广西优良用材林资源培育重点实验室, 南宁, 530002;[蒋迎红] 中南林业科技大学生命科学与技术学院, 长沙, 410004 广西壮族自治区林业厅保护处, 南宁, 530028;[刘雄盛; 蒋燚; 何应会] 广西壮族自治区林业科学研究院, 广西优良用材林资源培育重点实验室, 南宁, 530002

关键词： 海南风吹楠;营养器官;解剖结构;环境适应性

摘要： 该研究采用石蜡切片和光学显微技术,对海南风吹楠营养器官的解剖结构及其对环境的适应性进行了探讨。结果表明:海南风吹楠为典型异面叶,叶片中脉发达,中部分化出髓,上表皮外侧具角质层,内侧具1层内皮层,下表皮外侧无角质层,有气孔器分布,气孔器为双环型,略下陷;栅栏组织3~4层细胞,海绵组织4~6层细胞。茎的初生结构中表皮轻微角质化,维管束为外韧型,8~10个初生维管束围绕髓排列为1轮;茎的次生结构中,表皮外部角质层加厚,维管柱紧密排列连成环状,次生韧皮部和次生木质部发达,形成层细胞3~5层。根的初生结构中表皮细胞外壁加厚,外皮层细胞体积大,形状不规则,内侧具1层形成层,内皮层具凯氏带,初生木质部为多原型,呈辐射状排列。根的次生结构中木栓层细胞5~ 6层,木栓层内侧具1层木栓形成层,栓内层细胞3层。海南风吹楠营养器官具有一定耐阴和耐旱结构特征,同时与其生活的热带雨林沟谷中高温荫湿的环境相适应。

语种： 中文

作者： Wei, Xiaocong;Deng, Xiangwen*;Xiang, Wenhua;Lei, Pifeng;Ouyang, Shuai;...

期刊： Biogeosciences,2018年15(9):2991-3002 ISSN：1726-4170

通讯作者： Deng, Xiangwen

作者机构： [Wen, Hongfang; Ouyang, Shuai; Lei, Pifeng; Chen, Liang; Xiang, Wenhua; Wei, Xiaocong; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Chen, Liang; Xiang, Wenhua; Deng, Xiangwen] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China.

通讯机构： [Deng, Xiangwen] C;[Deng, Xiangwen] H;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China.

摘要： Rocky desertification is a major ecological problem of land degradation in karst areas. In these areas, the high soil calcium (Ca) content has become an important environmental factor that can affect the restoration of vegetation. Consequently, the screening of plant species that can adapt to high Ca soil environments is a critical step in vegetation restoration. In this study, three grades of rocky desertification sample areas were selected in karst areas of southwestern Hunan, China (LRD: light rocky desertification; MRD: moderate rocky desertification; and IRD: intense rocky desertification). Each grade of these sample areas had three sample plots in different slope positions, each of which had four small quadrats (one in rocky-side areas, three in nonrocky- side areas). We measured the Ca content of leaves, branches, and roots from 41 plant species, as well as soil total Ca (TCa) and exchangeable Ca (ECa) at depths of 0- 15, 15-30, and 30-45 cm in each small quadrat. The results showed that the soil Ca2C content in rocky-side areas was significantly higher than that in non-rocky-side areas (p < 0:05). The mean soil TCa and ECa content increased gradually along with the grade of rocky desertification, in the order IRD >MRD< LRD. For all plant functional groups, the plant Ca content of aboveground parts was significantly higher than that of the belowground parts (p < 0:05). The soil ECa content had significant effects on plant Ca content of the belowground parts but had no significant effects on plant Ca content of the aboveground parts. Of the 41 plant species that were sampled, 17 were found to be dominant (important value > 1). The differences in Ca2C content between the aboveground and belowground parts of the 17 ominant species were calculated, and their correlations with soil ECa content were analyzed. The results showed that these 17 species can be divided into three categories: Caindifferent plants, high-Ca plants, and low-Ca plants. These findings provide a vital theoretical basis and practical guide for vegetation restoration and ecosystem reconstruction in rocky desertification areas. © Author(s) 2018.

语种： 英文

作者： Ouyang, Shuai;Xiao, Kaiyu;Zhao, Zhonghui*;Xiang, Wenhua;Xu, Chuanhong;...

期刊： Forests,2018年9(4) ISSN：1999-4907

通讯作者： Zhao, Zhonghui

作者机构： [Ouyang, Shuai; Lei, Pifeng; Xiao, Kaiyu; Xu, Chuanhong; Zhao, Zhonghui; Xiang, Wenhua; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Xiao, Kaiyu; Zhao, Zhonghui; Xiang, Wenhua; Deng, Xiangwen] Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong 438107, Peoples R China.;[Li, Jiangrong] Tibet Agr & Anim Husb Univ, Ecol Res Inst Xizang Plateau, Linzhi 860000, Peoples R China.

通讯机构： [Zhao, Zhonghui] C;[Zhao, Zhonghui] H;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong 438107, Peoples R China.

关键词： Cunninghamia lanceolata;Sap flow density;Stand transpiration;Water use

摘要： Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) is an important native tree species that is widely distributed in subtropical areas of southern China and cultivated for wood extraction. However, information on water use by Chinese fir plantations is still scarce. In this study, we performed species-specific parameter calibrations for the original Granier equation for sap flow density (SFD) estimates. Stand transpiration (Es) was related to environmental inputs, such as rainfall, air temperature (Ta), vapor pressure deficit (VPD), photosynthetically-active radiation (PAR), air relative humidity (RH), and potential evapotranspiration (PET) in order to examine how environmental factors affect the Es of Chinese fir plantations. According to our results, Granier's original parameters set underestimated C. lanceolata SFD by up to 54% compared to our species-specific calibrated parameters set. A strong positive correlation was found between SFD, diameter at breast height (DBH), and tree height among trees populations. The total Es in 2015 was 522.1 mm, with obvious seasonal dynamics and an average of 1.4 mm·day-1. Daily and monthly Es were positively correlated with VPD, PAR, Ta, and PET. A negative relationship between Es and RH was detected only at a daily timescale. Our findings indicate that the original Granier equation requires a parameter calibration when it is applied to species-specific thermal dissipation probe (TDP) estimates, and our findings can also provide novel insights on the water use of Chinese fir in major wood production areas in Southern China. © 2018 by the authors.

语种： 英文

作者： 吴安驰;邓湘雯;任小丽;项文化;张黎;...

期刊： 生态学报,2018年38(21):7727-7738 ISSN：1000-0933

通讯作者： He, H.

作者机构： 中南林业科技大学生命科学与技术学院, 长沙, 410004;南方林业生态应用技术国家工程实验室, 南方林业生态应用技术国家工程实验室, 长沙, 410004;中国科学院地理科学与资源研究所, 中国科学院生态系统网络观测与模拟重点实验室, 北京, 100101;中国科学院大学, 北京, 100049;沈阳农业大学, 沈阳, 110866

通讯机构： Key Laboratory of Ecosystem Network Observation and Modeling, Institution of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China

关键词： 森林生态系统;物种多样性;能量;水分;植物特性;方差分解

摘要： 物种多样性地理分布格局及其成因是生物地理学和宏观生态学研究的核心问题之一,基于中国13个典型森林生态系统乔木层群落植物的调查数据,分析物种多样性随经纬度的变化规律,探讨物种多样性空间分布格局的影响因素。结果表明: (1) 13个典型森林生态系统的4个物种多样性指数均随经纬度上升而下降,其中物种丰富度变化更为显著,而Shannon-Wiener指数、Simpson指数和Pielou指数随经度上升变化不显著; (2)相关性分析结果显示,物种多样性指数与植物特性、能量和水分因子的单因素相关关系并不一致。其中,物种丰富度、Shannon-Wiener指数和Simpson指数与年均温、最冷月均温、温度年较差和潜在蒸散量的相关性最显著(P<0.01),Pielou指数与年均温、最冷月均温、实际蒸散量、潜在蒸散量和郁闭度有显著相关关系(P<0.05); (3)方差分解结果表明,能量和水分的共同作用对物种多样性指数空间分布格局的解释率最高,达到15%—42%;植物特性、能量和水分因子三者共同作用对物种多样性指数空间分布格局解释率次之,为14%—27%;植物特性与能量因子或水分因子两者之间的共同作用以及植物特性和水分因子独立作用对物种多样性指数空间分布格局的解释率较小,其中能量因子对物种多样性指数空间分布格局的单独解释率高于植物特性或水分因子。研究表明能量和水分共同作用是影响大尺度森林乔木层物种多样性空间分布格局形成的主要因素,但植物特性的差异对物种多样性空间分布格局影响也不可忽视。

语种： 中文

作者： 方晰;陈金磊;王留芳;李胜蓝;项文化;...

期刊： 中南林业科技大学学报,2018年38(12):1-12 ISSN：1673-923X

作者机构： [方晰; 项文化; 雷丕锋] 中南林业科技大学 生命科学与技术学院,湖南长沙410004;[方晰; 项文化; 雷丕锋] 中南林业科技大学 南方林业生态应用技术国家工程实验室,湖南长沙410004;中南林业科技大学 生命科学与技术学院,湖南长沙,410004;[李胜蓝; 王留芳; 陈金磊] 中南林业科技大学

关键词： 森林土壤磷有效性;磷分级;研究进展;亚热带

摘要： 磷(P)是植物生长发育过程中必需的营养元素之一。有效提高森林土壤P的生物有效性,高效利用土壤中潜在的P资源,从根本上解决土壤“缺P”的难题,对解决中国亚热带森林可持续经营和生态恢复所面临的经济、环境和资源问题具有重要的意义。结合国内外的研究成果,综述了P在土壤—植物系统中循环、转化过程,土壤P有效性研究与土壤P分级的关系,亚热带森林土壤P有效性的研究现状及其影响因素的复杂性。研究表明, P在土壤—植物系统中的循环转化过程是由土壤物理、化学、生物学性质以及植物自身的遗传特性共同控制的;土壤P化学分级不仅是研究陆地生态系统P循环的核心,也是研究土壤P有效性的关键;亚热带森林土壤P形态特征及其与土壤P有效性的关系目前还没有明确和统一,林龄对林地土壤P含量的影响还存在较大的不确定性,土壤P有效性随着森林演替的变化趋势仍存在不一致性。最后针对当前的研究现状,提出了森林土壤P有效性的形成转化机理及其影响机制,寻找有效提高森林土壤P有效性的途径;随着森林演替进程和全球变化,土壤P的限制性是否更为加剧,以及同位素示踪法和~(31)P-NMR波谱技术的应用等不仅是亚热带森林土壤P有效性研究面临的一些问题,也是今后研究的热点。

语种： 中文

作者： Pei, Yameng;Lei, Pifeng*;Xiang, Wenhua;Ouyang, Shuai;Xu, Yiye

期刊： Sustainability,2018年10(7) ISSN：2071-1050

通讯作者： Lei, Pifeng

作者机构： [Ouyang, Shuai; Lei, Pifeng; Pei, Yameng; Xiang, Wenhua; Xu, Yiye] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Xu, Yiye] Natl Engn Lab Appl Technol Forestry & Ecol Southe, Changsha 410004, Hunan, Peoples R China.;[Xiang, Wenhua] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China.

通讯机构： [Lei, Pifeng] C;[Lei, Pifeng] N;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Natl Engn Lab Appl Technol Forestry & Ecol Southe, Changsha 410004, Hunan, Peoples R China.

关键词： Cunninghamia lanceolata (Lamb.) Hook;fine root biomass and production;specific root length;tissue density;vertical distribution;stand age

摘要： Despite the great importance of fine roots, which are referred to as roots smaller than 2 mm in diameter, in terms of carbon and nutrient cycling in terrestrial ecosystems, how fine root biomass, production, and turnover rate change with stand development remains poorly understood. Here we assessed the variations of fine root biomass, production, and morphology of trees and understory vegetation in Chinese fir (Cunninghamia lanceolata (Lamb.) Hook) plantations at the ages of 7 years old, 17 years old and 25 years old in southern China, representing the sapling, pole and mature stage, respectively. Fine roots of trees and understory vegetation were sampled with sequential coring method to a depth of 60 cm and sliced into 4 layers (0-15, 15-30, 30-45 and 45-60 cm). Fine root biomass and necromass were highest in the pole stages among these three different aged Chinese fir plantations, although the significant differences were only detected for fine root necromass between 25-year-old and 7-year-old plantations. Fine root biomass of Chinese fir was heterogeneous in both temporal and spatial dimensions. Seasonal variation of fine root biomass in three age groups showed a similar pattern that the standing fine root biomass reached a peak in January and fell to the lowest in July. Vertically, the fine root biomass decreased with the increase of soil depth, but this extinction rate decreased with stand development. The effects of stand age on either total fine root length and surface area, or specific root length were not significant. However, the root tissue density increased significantly with Chinese fir stand ages, which suggested that the fine roots on Chinese fir may resort more to the mycorrhizal associations for the nutrient and water acquisition in the later stage of Chinese fir plantations. In addition to the stand age effect, the fine roots exhibited highly spatial and temporal variations in Chinese plantations, indicating different root foraging strategies for soil nutrient and water acquisition. Therefore, the fine root research not only helps to understand its role in carbon sequestration in terrestrial ecosystem under global climate change, but can also improve our understanding of nutrient management in forest ecosystem. At the same time, the research on the productivity of the Chinese fir growth stage provides guiding significance for the construction and management of Chinese fir. © 2018 by the authors.

语种： 英文

作者： Jiang, Yinghong;Liu, Xiongsheng;Xiang, Wenhua*;Jiang, Yi;He, Yinghui

期刊： Biotechnology & Biotechnological Equipment,2018年32(1):95-101 ISSN：1310-2818

通讯作者： Xiang, Wenhua

作者机构： [Jiang, Yinghong; Xiang, Wenhua] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Dept Ecol Lab, Changsha, Hunan, Peoples R China.;[Jiang, Yinghong] Dept Forestry Guangxi Zhuang Autonomous Reg, Dept Wildlife Protect, Wildlife Protect & Nat Reserve Management Off, Nanning, Peoples R China.;[He, Yinghui; Liu, Xiongsheng; Jiang, Yi] Guangxi Zhuang Autonomous Reg Forestry Res Ins, Inst Forest Management, Dept Forestry Guangxi Zhuang Autonomous Reg, Nanning, Peoples R China.

通讯机构： [Xiang, Wenhua] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Dept Ecol Lab, Changsha, Hunan, Peoples R China.

关键词： endangered mechanism;genetic diversity;genetic structure;Horsfieldia hainanensisMerr;ISSR marker

摘要： The genetic diversity and structure of nine natural populations of Horsfieldia hainanensis Merr., an endangered plant endemic to China, were studied using inter-simple sequence repeat markers. Nine primers were selected from 100 primers to evaluate 126 individual plants, from which a total of 136 bands were amplified and 108 bands were polymorphic. Our results demonstrated that the genetic diversity level of H. hainanensis was high with a percentage of polymorphic bands, Shannon's diversity index and Nei's genetic diversity index at the species level of 79.4%, 0.4787 and 0.3314, respectively, and correspondingly, averages of 40.4%, 0.2615 and 0.1843 at the population level. Significant genetic differentiation was observed among populations, showing that the coefficient of genetic differentiation among populations calculated using Nei's genetic diversity was 0.4509. The ranges of Nei's genetic identity and genetic distance among populations were 0.7387–0.8637 and 0.1466–0.3029, respectively. The unweighted pair group method with arithmetic mean clustering based on Nei's genetic distance indicated that nine natural H. hainanensis populations could be classified into two lineages. Collectively, we speculated that habitat fragmentation and disturbance from human activities could be considered the main reasons for the endangerment of H. hainanensis, and we propose in situ conservation for the existing natural H. hainanensis populations, especially at Mengtun, Niandou and Tongbiguan, where the genetic diversity is relatively high. © 2017 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group.

语种： 英文

作者： Yang, Jingjun;Lei, Pifeng*;Xiang, Wenhua;Ouyang, Shuai;Hui, Xinrong

期刊： Forests,2018年9(7) ISSN：1999-4907

通讯作者： Lei, Pifeng

作者机构： [Ouyang, Shuai; Lei, Pifeng; Xiang, Wenhua; Yang, Jingjun; Hui, Xinrong] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Lei, Pifeng; Yang, Jingjun; Hui, Xinrong] Natl Engn Lab Appl Technol Forestry & Ecol Southe, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Xiang, Wenhua] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China.

通讯机构： [Lei, Pifeng] C;[Lei, Pifeng] N;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Natl Engn Lab Appl Technol Forestry & Ecol Southe, Changsha 410004, Hunan, Peoples R China.

关键词： Allometry;Complementarity;Growth;Species identity;Species richness;Successional stage

摘要： Despite the accumulating evidence of the beneficial effects of diverse mixed species forests on ecosystem functioning and services, foresters in subtropical forest cultivation in China still prefer easily managed monocultures, which is also due to the complexity of mixed forests and the unknown underlying mechanisms related to relationships between biodiversity and forest growth. In a designed pot experiment, we selected two early-successional tree species (Pinus massoniana Lamb., Liquidambar formosana Hance.) and two late-successional tree species (Schima superba Champ., Elaeocarpus decipiens Hemsl.) and planted four saplings in one pot with regard to tree species diversity (monoculture, two species and four species mixtures), each combination replicated four times. In this three-year duration experiment, the effect of tree species diversity, tree identity, and functional traits on sapling growth (tree height, ground diameter, crown projection area), were analyzed. The results showed that the increments of ground diameter and crown projection area increased with tree species richness, whereas the mean tree height increment showed the opposite effect. This growth variation was species specific and related to functional traits (early or late succession), as the increments of the early successional tree species (P. massoniana Lamb. and L. formosana Hance.) had a positive correlation with tree species richness, while the late successional tree species (E. decipiens Hemsl. and S. superba Champ.) showed negative effects. In addition, our study provided evidence for the allometric differences between mixtures and monocultures, which have an important reference value on mixed-species forests. © 2018 by the authors.

语种： 英文

作者： Huang, Yuanyuan;Chen, Yuxin;Castro-Izaguirre, Nadia;Baruffol, Martin;Brezzi, Matteo;...

期刊： Science,2018年362(6410):80-83 ISSN：0036-8075

通讯作者： Niklaus, Pascal A.;Schmid, Bernhard;Bruelheide, Helge;Ma, Keping

作者机构： [Chen, Yuxin; Schmid, Bernhard; Liu, Xiaojuan; Niklaus, Pascal A.; Schmid, B; Baruffol, Martin; Castro-Izaguirre, Nadia; Huang, Yuanyuan; Brezzi, Matteo] Univ Zurich, Dept Evolutionary Biol & Environm Studies, CH-8057 Zurich, Switzerland.;[Baruffol, Martin] Inst Invest Recursos Biol Alexander von Humboldt, Calle 28A 5-09, Bogota, Colombia.;[Schuldt, Andreas; Assmann, Thorsten; Lang, Anne; Haerdtle, Werner; Li, Ying] Leuphana Univ Luneburg, Inst Ecol, Univ Allee 1, D-21335 Luneburg, Germany.;[Erfmeier, Alexandra; Schuldt, Andreas; von Oheimb, Goddert; Buscot, Francois; Wubet, Tesfaye; Wirth, Christian; Bruelheide, Helge; Trogisch, Stefan; Welk, Erik] German Ctr Integrat Biodivers Res iDiv, Deutsch Pl 5e, D-04103 Leipzig, Germany.;[von Oheimb, Goddert] Tech Univ Dresden, Inst Gen Ecol & Environm Protect, POB 1117, D-01735 Tharandt, Germany.

通讯机构： [Niklaus, PA; Schmid, B] U;[Bruelheide, Helge] G;[Bruelheide, Helge] M;[Ma, Keping] C;Univ Zurich, Dept Evolutionary Biol & Environm Studies, CH-8057 Zurich, Switzerland.

摘要： Biodiversity experiments have shown that species loss reduces ecosystem functioning in grassland. To test whether this result can be extrapolated to forests, the main contributors to terrestrial primary productivity, requires large-scale experiments.We manipulated tree species richness by planting more than 150,000 trees in plots with 1 to 16 species. Simulating multiple extinction scenarios, we found that richness strongly increased stand-level productivity. After 8 years, 16-species mixtures had accumulated over twice the amount of carbon found in average monocultures and similar amounts as those of two commercial monocultures. Species richness effects were strongly associated with functional and phylogenetic diversity. A shrub addition treatment reduced tree productivity, but this reduction was smaller at high shrub species richness. Our results encourage multispecies afforestation strategies to restore biodiversity and mitigate climate change. © 2018 The Authors.

语种： 英文

作者： Shu, Weiwei;Shen, Xiaoxiao;Lei, Pifeng*;Xiang, Wenhua;Ouyang, Shuai;...

期刊： BMC Ecology,2018年18(1):1-10 ISSN：1472-6785

通讯作者： Lei, Pifeng

作者机构： [Shu, Weiwei; Ouyang, Shuai; Lei, Pifeng; Xiang, Wenhua; Yan, Wende; Shen, Xiaoxiao] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Xiang, Wenhua; Yan, Wende] Cent South Univ Forestry & Technol, Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha 410004, Hunan, Peoples R China.

通讯机构： [Lei, Pifeng] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha 410004, Hunan, Peoples R China.

关键词： Fine root biomass;Vertical distribution;Specific root length;Overyielding;Stand age

摘要： Background: Mixed forests are believed to enhance ecosystem functioning and sustainability due to complementary resource use, environmental benefits and improved soil properties. The facilitation between different species may induce overyielding. Meanwhile, the species-specific fine root foraging strategies and tradeoffs would determine the structure and dynamics of plant communities. Here the aim was to investigate the admixing effects of fine-root biomass, vertical distribution and morphology in Pinus massoniana-Cinnamomum camphora mixed plantations and corresponding monocultures at 10-, 24- and 45-year old stands. Results: The fine root biomass in the Pinus-Cinnamomum mixed forest exerted a certain degree of overyielding effect. These positive admixing effects, however, did not enhance with forest stand development. The overall relative yield total ranged from 1.83 and 1.51 to 1.33 in 10-, 24- and 45-year-old stand, respectively. The overyielding was mainly attributed to the over-performance of late successional species, Cinnamomum, in mixed stands. The vertical fine root biomass distribution model showed fine roots of pioneer species, Pinus, shifted to the superficial layer when mixed with Cinnamomum. Furthermore, the specific root length (SRL) of Pinus was significantly higher in Pinus-Cinnamomum mixed stands than that in monocultures, and the magnitude of differences increased over time. However, the vertical fine-root distribution and SRL for Cinnamomum did not show significant differences between monoculture and mixtures. Conclusions: Our results indicated that the magnitude of fine root overyielding in mixed forests showed a high degree of consistency with the total amount of fine root biomass itself, suggesting the overyielding effects in mixed forests were correlated with the degree of belowground interaction and competition degree involved. The late successional species, Cinnamomum, invested more carbon to belowground by increasing the fine root biomass in mixtures. While the pioneer species, Pinus, adapted to the presence of the species Cinnamomum by modification of vertical distribution and root morphological plasticity in the mixtures. These species-specific fine root foraging strategies might imply the differences of forest growth strategies of co-occurring species and contribute to the success and failure of particular species during the succession over time. © 2018 The Author(s).

语种： 英文

作者： Ning, Chen*;Mueller, Gregory M.;Egerton-Warburton, Louise M.;Wilson, Andrew W.;Yan, Wende;...

期刊： Forests,2018年9(3) ISSN：1999-4907

通讯作者： Ning, Chen

作者机构： [Xiang, Wenhua; Yan, Wende; Ning, Chen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ning, Chen; Mueller, Gregory M.; Egerton-Warburton, Louise M.; Wilson, Andrew W.] Northwestern Univ, Program Plant Biol & Conservat, Evanston, IL 60208 USA.;[Ning, Chen; Mueller, Gregory M.; Egerton-Warburton, Louise M.; Wilson, Andrew W.] Chicago Bot Garden, Glencoe, IL 60022 USA.;[Wilson, Andrew W.] Denver Bot Gardens, Sam Mitchel Herbarium Fungi, Denver, CO 80206 USA.

通讯机构： [Ning, Chen] C;[Ning, Chen] N;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Northwestern Univ, Program Plant Biol & Conservat, Evanston, IL 60208 USA.;Chicago Bot Garden, Glencoe, IL 60022 USA.

关键词： Atmospheric nitrogen dep-osition;China;Extracellular enzymes;Hyphal exploration strategy;Russula

摘要： Rapid economic development and accelerated urbanization in China has resulted in widespread atmospheric nitrogen (N) deposition. One consequence of N deposition is the altera-tion of mycorrhizal symbioses that are critical for plant resource acquisition (nitrogen, N, phos-phorus, P, water). In this study, we characterized the diversity, composition, and functioning of ectomycorrhizal (ECM) fungal communities in an urban-adjacent Pinus elliottii plantation under ambient N deposition (~24 kg N ha-1 year-1), and following N fertilization (low N, 50 kg N ha-1 year-1; high N, 300 kg N ha-1 year-1). ECM functioning was expressed as the potential activities of extracellular enzymes required for organic N (protease), P (phosphomonoesterase), and recalci-trant polymers (phenol oxidase). Despite high ambient N deposition, ECM community composi-tion shifted under experimental N fertilization, and those changes were linked to disparate levels of soil minerals (P, K) and organic matter (but not N), a decline in acid phosphatase (AP), and an in-crease in phenol oxidase (PO) potential activities. Based on enzyme stoichiometry, medium-smooth exploration type ECM species invested more in C acquisition (PO) relative to P (AP) following high N fertilization than other exploration types. ECM species with hydrophilic mantles also showed higher enzymatic PO:AP ratios than taxa with hydrophobic mantles. Our findings add to the ac-cumulating evidence that shifts in ECM community composition and taxa specialized in organic C, N, and P degradation could modulate the soil nutrient cycling in forests exposed to chronic ele-vated N input. © 2018 by the authors.

语种： 英文

作者： Xu, Chuanhong;Xiang, Wenhua;Gou, Mengmeng;Chen, Liang;Lei, Pifeng;...

期刊： Sustainability,2018年10(6) ISSN：2071-1050

通讯作者： Ouyang, Shuai

作者机构： [Ouyang, Shuai; Lei, Pifeng; Chen, Liang; Xu, Chuanhong; Xiang, Wenhua; Fang, Xi; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Chen, Liang; Xu, Chuanhong; Xiang, Wenhua; Fang, Xi; Deng, Xiangwen] Chinese Fir Plantat Ecosyst Hunan Prov, Huitong Natl Stn Sci Observat & Res, Huitong 438107, Peoples R China.;[Gou, Mengmeng] Chinese Res Inst Environm Sci, Beijing 100012, Peoples R China.

通讯机构： [Ouyang, Shuai] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Chinese Fir Plantat Ecosyst Hunan Prov, Huitong Natl Stn Sci Observat & Res, Huitong 438107, Peoples R China.

关键词： Restoration stages;Soil layers;Soil nutrient;Soil stoichiometry;Subtropical secondary forest

摘要： Forest restoration affects nutrient cycling in terrestrial ecosystems. However, the dynamics of carbon (C), nitrogen (N), and phosphorous (P), and their stoichiometry (C:N:P ratio) in the soil during forest restoration are poorly understood in subtropical areas. In the current study, we collected soil samples at three depths (0-10, 10-20, and 20-30 cm) at three restoration stages (early, intermediate, and late) in subtropical forests. Soil organic carbon (SOC), total nitrogen (N), and total phosphorous (P) concentrations were determined. Forest restoration significantly affected soil nutrient concentrations and stock (p < 0.05). SOC concentrations increased from 12.6 to 18.6 g/kg and N concentrations increased from 1.2 to 1.6 g/kg, while P decreased from 0.3 to 0.2 g/kg. A similar pattern of change was found for the nutrient stock as restoration proceeded. C:P and N:P ratios increased to a greater extent than that of C:N ratios during forest restoration, implying that subtropical forests might be characterized by P limitation over time. The slopes and intercepts for the linear regression relationships between SOC, N, and P concentrations were significantly different across the forest restoration stages (p < 0.05). This indicated that forest restoration significantly affects the coupled relationships among C-N, C-P, and N-P in subtropical forest soil. Our results add to the current body of knowledge about soil nutrient characteristics and have useful implications for sustainable forest management in subtropical areas. © 2018 by the authors.

语种： 英文

作者： Jiang, Fang;Wu, Xiaohong;Xiang, Wenhua*;Fang, Xi;Zeng, Yeling;...

期刊： Plant and Soil,2017年413(1-2):289-301 ISSN：0032-079X

通讯作者： Xiang, Wenhua

作者机构： [Ouyang, Shuai; Lei, Pifeng; Jiang, Fang; Xiang, Wenhua; Zeng, Yeling; Wu, Xiaohong; Fang, Xi; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Jiang, Fang; Xiang, Wenhua; Zeng, Yeling; Fang, Xi; Deng, Xiangwen] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Wu, Xiaohong; Deng, Xiangwen] Natl Engn Lab Appl Technol Forestry & Ecol Southe, Changsha 410004, Hunan, Peoples R China.;[Peng, Changhui] Univ Quebec, Inst Environm Sci, Dept Biol Sci, Montreal, PQ H3C 3P8, Canada.

通讯机构： [Xiang, Wenhua] H;Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Hunan, Peoples R China.

关键词： Deciduous broadleaved forest;Evergreen broadleaved forest;Soil texture;Spatial variations;Stand characteristics;Topography

摘要： Aims: Our study aimed to determine whether, and to what extent, stand characteristics and topography affected spatial variations in soil organic carbon (SOC), total nitrogen (TN) and total phosphorus (TP) concentrations in subtropical forests. Methods: Soil samples were taken from a Choerospondias axillaris deciduous broadleaved forest and a Lithocarpus glaber–Cyclobalanopsis glauca evergreen broadleaved forest. Spatial variations in SOC, TN and TP concentrations and the factors affecting them were investigated using geostatistical analysis and stepwise linear regression, respectively. Results: The L. glaber–C. glauca forest exhibited higher coefficients of variation (CVs) of SOC (35 %) and TN (34 %) concentrations than the C. axillaris forest (27 % for SOC and 21 % for TN), but the CV of TP concentration in the L. glaber–C. glauca forest (17 %) was lower than that in the C. axillaris forest (24 %). Stand characteristics contributed the most to spatial variations in SOC and TP, while soil texture made the greatest contribution to variations in TN. Topography contributed the least to variations in SOC, TN and TP. Conclusions: Stand characteristics, together with topography and soil texture, contributed to spatial variations in SOC, TN and TP concentrations. The contributions of stand characteristics differed in SOC, TN and TP due to their different cycling characteristics. © 2016, Springer International Publishing Switzerland.

语种： 英文

作者： Zeng, Weixian;Xiang, Wenhua*;Zhou, Bo;Lei, Pifeng;Zeng, Yelin

期刊： Plant and Soil,2017年420(1-2):539-552 ISSN：0032-079X

通讯作者： Xiang, Wenhua

作者机构： [Lei, Pifeng; Zhou, Bo; Zeng, Weixian; Xiang, Wenhua; Zeng, Yelin] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, 498 Southern Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.;[Lei, Pifeng; Zeng, Weixian] Natl Engn Lab Appl Technol Forestry & Ecol Southe, Changsha 410004, Hunan, Peoples R China.;[Lei, Pifeng; Xiang, Wenhua; Zeng, Yelin] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China.

通讯机构： [Xiang, Wenhua] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, 498 Southern Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.

关键词： Belowground diversity;Fine-root mixture;Multiple species forest;Relative proportions;qPCR;Species-specific primers

摘要： Background and aims: Direct measurement of fine root diversity is very important to unveil belowground interaction, community dynamics and ecosystem functions in forests, but is limited by the effective method. This study attempted to develop specific primers for a quantitative real-time PCR (qPCR) method to determine diversity of fine roots and test whether this method could be applied in field forests. Methods: We used inter-simple sequence repeat (ISSR) analyses to develop the specific primers and applied the qPCR method to determine the belowground diversity of fine roots in soil samples collected from field tree clusters containing different species. Results: Specific primers were successfully developed to identify six tree species. The relative proportions of each species in known fine-root mixtures predicted by the qPCR method agreed well (r2 > 0.86, P < 0.001) with the actual relative proportions of the corresponding species. All aboveground tree species in belowground fine-root samples were detected. But tree species richness and relative proportions of belowground fine roots predicted by the qPCR method differed from aboveground trees within a given cluster. Conclusions: Developing specific primers is the critical step in the qPCR method. The qPCR method can be used to determine belowground diversity of fine roots in forests. © 2017, Springer International Publishing AG.

语种： 英文

作者： Chen, Lingxiu;Xiang, Wenhua*;Wu, Huili;Lei, Pifeng;Zhang, Shengli;...

期刊： Ecology and Evolution,2017年7(14):5366-5377 ISSN：2045-7758

通讯作者： Xiang, Wenhua

作者机构： [Chen, Lingxiu; Ouyang, Shuai; Wu, Huili; Lei, Pifeng; Xiang, Wenhua; Fang, Xi; Zhang, Shengli; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.;[Ouyang, Shuai; Wu, Huili; Lei, Pifeng; Xiang, Wenhua; Fang, Xi; Deng, Xiangwen] Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong, Hunan, Peoples R China.

通讯机构： [Xiang, Wenhua] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.

关键词： competitive ability;functional traits;relative growth rate;shade tolerance;tree social status

摘要： Abstract Wood density (WD) is not only an important parameter to estimate aboveground biomass but also an indicator of timber quality and plant adaptation strategies to stressful conditions (i.e., windthrow, pests, and pathogens). This study had three objectives: (1) to compare WD among seven subtropical tree species; (2) to determine how tree growth traits may influence possible differences in WD between the pioneer and shade‐tolerant species; and (3) to examine whether or not WD differs by tree social status (dominant vs. suppressed trees) within species. To do this, 70 trees were destructively harvested. From each tree, disks at different stem heights were obtained and subjected to a method of stem analysis to measure whole tree level WD. The results showed that WD differed significantly among the seven species (p<.001). Their average WD was 0.537g/cm3, ranging from 0.409g/cm3 for Choerospondias axillaris to 0.691g/cm3 for Cyclobalanopsis glauca. The average WD of the four pioneer species (0.497±0.13g/cm3) was significantly lower (p<.01) than that of the three shade‐tolerant species (0.589±0.12g/cm3). The WD of the pioneers had a significant positive correlation with their stem diameter at breast height (DBH), tree height (H), and tree age, but WD had a significant negative correlation with relative growth rate (RGR). In contrast, the WD of the shade‐tolerant tree species had no significant relationships with DBH, H, tree age, or RGR. The dominant trees of the pioneer species had a higher WD than the suppressed trees, whereas the shade‐tolerant species had a lower WD for dominant trees than the suppressed trees. However, the differences in WD between dominant and suppressed trees were not significant. Taken together, the results suggest that classifying species into pioneer and shade‐tolerant groups to examine the effects of tree growth traits and social status could improve our understanding of intra‐ and interspecific variation in WD among subtropical tree species. We investigated inter‐ and intraspecific variation in WD among seven tree species in the subtropical region of Jingzhou County, Hunan Province, southern China. And the results imply that influences of tree growth traits and social status on WD were more pronounced for early successional tree species than late successional tree species in subtropical China

语种： 英文

作者： Liu, Yan;Lei, Pifeng*;Xiang, Wenhua;Yan, Wende;Chen, Xiaoyong

期刊： Biogeosciences,2017年14(17):3937-3945 ISSN：1726-4170

通讯作者： Lei, Pifeng

作者机构： [Liu, Yan; Lei, Pifeng; Xiang, Wenhua; Yan, Wende] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Lei, Pifeng; Yan, Wende; Chen, Xiaoyong] Cent South Univ Forestry & Technol, Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha 410004, Hunan, Peoples R China.;[Chen, Xiaoyong] Governors State Univ, Div Sci, Coll Arts & Sci, University Pk, IL 60484 USA.

通讯机构： [Lei, Pifeng] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;Cent South Univ Forestry & Technol, Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha 410004, Hunan, Peoples R China.

摘要： With the increasing trend of converting monocultures into mixed forests, more and more studies have been carried out to investigate the admixing effects on tree growth and aboveground carbon storage. However, few studies have considered the impact of mixed forests on belowground carbon sequestration, particularly changes in soil carbon and nitrogen stocks as a forest grows. In this study, paired pure Pinus massoniana plantations, Cinnamomum camphora plantations and mixed Pinus massoniana-Cinnamomum camphora plantations at ages of 10, 24 and 45 years were selected to test whether the mixed plantations sequestrate more organic carbon (OC) and nitrogen (N) in soils and whether this admixing effect becomes more pronounced with stand ages. The results showed that tree species identification, composition and stand age significantly affected soil OC and N stocks. The soil OC and N stocks were the highest in mixed Pinus-Cinnamomum stands compared to those in counterpart monocultures with the same age in the whole soil profile or specific soil depth layers (0-10, 10-20 and 20-30cm) for most cases, followed by Cinnamomum stands and Pinus stands with the lowest. These positive admixing effects were mostly nonadditive. Along the chronosequence, the soil OC stock peaked in the 24-year-old stand and was maintained as relatively stable thereafter. The admixing effects were also the highest at this stage. However, in the topsoil layer, the admixing effects increased with stand ages in terms of soil OC stocks. When comparing mixed Pinus-Cinnamomum plantations with corresponding monocultures within the same age, the soil N stock in mixed stands was 8.30, 11.17 and 31.45% higher than the predicted mean value estimated from counterpart pure species plantations in 10-, 24- and 45-year-old stands, respectively. This suggests that these admixing effects were more pronounced along the chronosequence. © Author(s) 2017.

语种： 英文

作者： Zeng, Yelin;Fang, Xi*;Xiang, Wenhua;Deng, Xiangwen;Peng, Changhui

期刊： Ecology and Evolution,2017年7(24):11033-11043 ISSN：2045-7758

通讯作者： Fang, Xi

作者机构： [Xiang, Wenhua; Zeng, Yelin; Fang, Xi; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.;[Xiang, Wenhua; Zeng, Yelin; Fang, Xi; Peng, Changhui; Deng, Xiangwen] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong, Peoples R China.;[Peng, Changhui] Univ Quebec Montreal, Inst Environm Sci, Dept Biol Sci, Montreal, PQ, Canada.

通讯机构： [Fang, Xi] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.

关键词： nutrient use strategy;resorption efficiency;resorption proficiency;stoichiometry ratios;successional stage

摘要： This study investigated seasonal patterns in stoichiometric ratios, nutrient resorption characteristics, and nutrient use strategies of dominant tree species at three successional stages in subtropical China, which have not been fully understood. Fresh leaf and leaf litterfall samples were collected in growing and nongrowing seasons for determining the concentrations of carbon (C), nitrogen (N), and phosphorus (P). Then, stoichiometric ratios (i.e., C:N, C:P, N:P, and C:N:P) and resorption parameters were calculated. Our results found that there was no consistent variation in leaf C:N and C:P ratios among different species. However, leaf N:P ratios in late-successional species became significantly higher, indicating that P limitation increases during successional development. Due to the P limitation in this study area, P resorption efficiency and proficiency were higher than corresponding N resorption parameters. Dominant tree species at early-successional stage adopted “conservative consumption” nutrient use strategy, whereas the species at late-successional stage inclined to adopt “resource spending” strategy. © 2017 The Authors. Ecology and Evolution published by John Wiley & Sons Ltd.

语种： 英文