作者机构：
[You, Ren; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Zhu, Ninghua; Liu, Fei; Wang, Jing] Cent South Univ Forestry & Technol, Fac Forestry, Changsha 410004, Hunan, Peoples R China.;[Deng, Xiangwen] Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha 410004, Peoples R China.;[Deng, Xiangwen] Huitong Natl Field Stn Sci Observat & Res Chinese, Huitong 438107, Peoples R China.
通讯机构：
[Zhu, Ninghua; Deng, Xiangwen] F;Faculty of Forestry, Central South University of forestry and Technology, Changsha, 410004, China.;Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, Hunan Province, China.;National Engineering Laboratory for Applied Technology of Forestry & Ecology in South China, Changsha, 410004, China.;Huitong National Field Station for Scientific Observation and Research of Chinese Fir Plantation Ecosystem in Hunan Province, Huitong, 438107, China.
摘要：
Chinese fir is one of the most important commercial timber species in China, with many geographic sources. However, little is known of the variation in wood physical properties among them. To explore the differences in wood physical properties and their influencing factors, five geographic sources of Chinese fir were selected. The variance inflation factor, stepwise regression, and principle component analysis were used to reduce multicollinearity and dimensions of the 19 wood physical properties (including density, shrinkage, and mechanical properties). The results showed that the wood density differed significantly among five geographic sources. The tangential shrinkage rate and radial shrinkage rate reached maximum values in black-heart Chinese fir (HNYX-T) but accompanied by the lowest value for difference dry shrinkage. The wood density and mechanical properties of HNYX-T was exceeded to that of others geographic sources. Fast-growth Chinese fir (FJYK-P) had the lowest value for all mechanical properties. The precipitation and temperature had significant correlations with the wood physical properties of this five geographic sources. The temperature in summer was mainly positive correlated with physical properties, while precipitation was negatively correlated with them. HNYX-T had the highest comprehensive score of PCA, followed by JXCS-R, emerged as higher-quality geographic source, which is important for selecting and utilizing geographic sources in forest management.
作者机构：
[Ouyang, Shuai; Wu, Huili; Lei, Pifeng; Kuzyakov, Yakov; Chen, Liang; Xiang, Wenhua; Zeng, Yelin; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Wu, Huili; Lei, Pifeng; Kuzyakov, Yakov; Chen, Liang; Xiang, Wenhua; Zeng, Yelin; Deng, Xiangwen] Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong 438107, Peoples R China.;[Zeng, Lixiong; Xiao, Wenfa] Chinese Acad Forestry, Key Lab Forest Ecol & Environm, State Forestry Adm, Res Inst Forest Ecol Environm & Protect, Beijing 100091, Peoples R China.;[Li, Shenggong] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China.;[Forrester, David I.] Swiss Fed Inst Forest Snow & Landscape Res WSL, Zurcherstr 111, CH-8903 Birmensdorf, Switzerland.
通讯机构：
[Xiang, Wenhua] C;[Xiang, Wenhua] 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：
Chinese fir plantation;forest floor;phosphorus uptake;rhizosphere processes;soil phosphorus stock;nutrient mobilization;phosphorus recycling
摘要：
Rocky desertification is a process of soil erosion and vegetation destruction. On the surface, the landscape of rocky desertification is similar to that of desertification, which has a negative impact on the social and economic development of Southwest China. To clarify the influence of soil properties on plant diversity in rocky desertification areas, three grades of rocky desertification in Southwest Hunan Province were selected: light rocky desertification (LRD), moderate rocky desertification (MRD) and intense rocky desertification (IRD). Soil pH, soil organic carbon (SOC), N, P, K, Ca, Mg were measured, and the species compositions of herbs and shrubs were investigated. The effects of soil properties on plant diversity were studied by using redundancy analysis (RDA). The results showed that except soil pH and Ca, which increased with rocky desertification grade, the soil component contents were MRD > LRD > IRD. The species richness of shrubs was higher than that of herbs, and the difference was significant in MRD. The diversity of herbs first decreased and then increased, and the distribution became increasingly uniform. By contrast, shrub diversity exhibited an opposing distribution trend. RDA analysis showed that the soil nutrient content differed significantly among the rocky desertification grades. Among the nutrients analysed, N, P and K were the main factors affecting species composition in the rocky desertification areas, and their distribution characteristics partly explained the uneven distributions of herbs and shrubs.
期刊：
Ecology and Evolution,2019年9(9):5338-5347 ISSN：2045-7758
通讯作者：
Deng, Xiangwen
作者机构：
[Ouyang, Shuai; Xiang, Wenhua; Yan, Wende; Wu, Anchi; Fang, Xi; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.;[Ouyang, Shuai; Xiang, Wenhua; Yan, Wende; Wu, Anchi; Fang, Xi; Deng, Xiangwen] Natl Engn Lab Appl Technol Forestry & Ecol South, Changsha, Hunan, Peoples R China.;[Ouyang, Shuai; Xiang, Wenhua; Yan, Wende; Wu, Anchi; Fang, Xi; Deng, Xiangwen] Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong, Peoples R China.;[He, Honglin] Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Ecosyst Network Observat & Modeling, Beijing, Peoples R China.;[Ren, Xiaoli; He, Honglin] Chinese Acad Sci, Grad Univ, Beijing, Peoples R China.
通讯机构：
[Deng, Xiangwen] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha, Hunan, Peoples R China.
关键词：
community structure;neutral theory model;niche model;secondary forests;spatial scaling;species abundance distributions
摘要：
To quantify and assess the processes underlying community assembly and driving tree species abundance distributions(SADs) with spatial scale variation in two typical subtropical secondary forests in Dashanchong state-owned forest farm, two 1-ha permanent study plots (100-m x 100-m) were established. We selected four diversity indices including species richness, Shannon-Wiener, Simpson and Pielou, and relative importance values to quantify community assembly and biodiversity. Empirical cumulative distribution and species accumulation curves were utilized to describe the SADs of two forests communities trees. Three types of models, including statistic model (lognormal and logseries model), niche model (broken-stick, niche preemption, and Zipf-Mandelbrodt model), and neutral theory model, were estimated by the fitted SADs. Simulation effects were tested by Akaike's information criterion (AIC) and Kolmogorov-Smirnov test. Results found that the Fagaceae and Anacardiaceae families were their respective dominance family in the evergreen broad-leaved and deciduous mixed communities. According to original data and random sampling predictions, the SADs were hump-shaped for intermediate abundance classes, peaking between 8 and 32 in the evergreen broad-leaved community, but this maximum increased with size of total sampled area size in the deciduous mixed community. All niche models could only explain SADs patterns at smaller spatial scales. However, both the neutral theory and purely statistical models were suitable for explaining the SADs for secondary forest communities when the sampling plot exceeded 40 m. The results showed the SADs indicated a clear directional trend toward convergence and similar predominating ecological processes in two typical subtropical secondary forests. The neutral process gradually replaced the niche process in importance and become the main mechanism for determining SADs of forest trees as the sampling scale expanded. Thus, we can preliminarily conclude that neutral processes had a major effect on biodiversity patterns in these two subtropical secondary forests but exclude possible contributions of other processes.
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.
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.
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
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
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：
<jats:title>Abstract</jats:title><jats:p>Wood density (<jats:styled-content style="fixed-case">WD</jats:styled-content>) 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 <jats:styled-content style="fixed-case">WD</jats:styled-content> among seven subtropical tree species; (2) to determine how tree growth traits may influence possible differences in <jats:styled-content style="fixed-case">WD</jats:styled-content> between the pioneer and shade‐tolerant species; and (3) to examine whether or not <jats:styled-content style="fixed-case">WD</jats:styled-content> 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 <jats:styled-content style="fixed-case">WD</jats:styled-content>. The results showed that <jats:styled-content style="fixed-case">WD</jats:styled-content> differed significantly among the seven species (<jats:italic>p</jats:italic><.001). Their average <jats:styled-content style="fixed-case">WD</jats:styled-content> was 0.537g/cm<jats:sup>3</jats:sup>, ranging from 0.409g/cm<jats:sup>3</jats:sup> for <jats:italic>Choerospondias axillaris</jats:italic> to 0.691g/cm<jats:sup>3</jats:sup> for <jats:italic>Cyclobalanopsis glauca</jats:italic>. The average <jats:styled-content style="fixed-case">WD</jats:styled-content> of the four pioneer species (0.497±0.13g/cm<jats:sup>3</jats:sup>) was significantly lower (<jats:italic>p</jats:italic><.01) than that of the three shade‐tolerant species (0.589±0.12g/cm<jats:sup>3</jats:sup>). The <jats:styled-content style="fixed-case">WD</jats:styled-content> of the pioneers had a significant positive correlation with their stem diameter at breast height (<jats:styled-content style="fixed-case">DBH</jats:styled-content>), tree height (<jats:italic>H</jats:italic>), and tree age, but <jats:styled-content style="fixed-case">WD</jats:styled-content> had a significant negative correlation with relative growth rate (<jats:styled-content style="fixed-case">RGR</jats:styled-content>). In contrast, the <jats:styled-content style="fixed-case">WD</jats:styled-content> of the shade‐tolerant tree species had no significant relationships with <jats:styled-content style="fixed-case">DBH</jats:styled-content>,<jats:italic> H</jats:italic>, tree age, or <jats:styled-content style="fixed-case">RGR</jats:styled-content>. The dominant trees of the pioneer species had a higher <jats:styled-content style="fixed-case">WD</jats:styled-content> than the suppressed trees, whereas the shade‐tolerant species had a lower <jats:styled-content style="fixed-case">WD</jats:styled-content> for dominant trees than the suppressed trees. However, the differences in <jats:styled-content style="fixed-case">WD</jats:styled-content> 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 <jats:styled-content style="fixed-case">WD</jats:styled-content> among subtropical tree species.</jats:p>
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：
Abstract 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. Leaf N:P ratios in late‐successional species became significantly higher, indicating that P limitation increases during successional development. P resorption efficiency and proficiency were higher than corresponding N resorption parameters due to P limitation. 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.
作者机构：
[Ouyang, Shuai; Wu, Huili; Lei, Pifeng; Xiang, Wenhua; Fang, Xi; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, Changsha 410004, 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 438107, Hunan, Peoples R China.
通讯机构：
[Xiang, Wenhua] C;[Xiang, Wenhua] 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, Hunan, Peoples R China.
摘要：
<jats:title>Abstract</jats:title><jats:p>Forests contain one of the world’s largest carbon (C) pools and represent opportunities for cost-effective climate change mitigation through programmes such as the United Nations-led “Reducing Emissions from Deforestation and Forest Degradation” Programme (REDD). Generic estimates for the conversion of forest biomass into C stock are not sufficiently accurate for assessing the utility of harvesting forest to offset carbon dioxide emissions, currently under consideration by the REDD Programme. We examined the variation in C concentration among tree species and tree functional types (classified based on leaf morphological and phenological traits) in a subtropical forest and evaluated the effects of these variations on stand-level estimations of C stock. This study was conducted in the Paiyashan Forest State Farm and the Dashanchong Forest Park, Hunan Province, China. C concentrations differed significantly among tree species (<jats:italic>P</jats:italic> < 0.0001) and were significantly higher in gymnosperm than angiosperm species. Estimations of stand C stocks were similar using either functional types or species- and tissue-specific C concentrations. The use of functional type classification to estimate stand C stock is an effective tool for implementing C sequestration trade and C credit programmes and the UN-REDD Programme in subtropical forests.</jats:p>
