中亚热带植被恢复阶段植物叶片、凋落物、土壤碳氮磷化学计量特征
作者：
陈婵;张仕吉;李雷达;刘兆丹;陈金磊;...
期刊：
植物生态学报 ,2019年43(8):658-671 ISSN：1005-264X
通讯作者：
Fang, X.
作者机构：
[辜翔; 陈婵; 刘兆丹; 陈金磊; 张仕吉; 王留芳; 李雷达] School of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, China;Huitong Natl. Fld. Stn. for Sci. Observ. and Res. of Chinese Fir Plantation Ecosystem in Hunan Prov., Huitong, Hunan, 438107, China;[方晰] School of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, China, Huitong Natl. Fld. Stn. for Sci. Observ. and Res. of Chinese Fir Plantation Ecosystem in Hunan Prov., Huitong, Hunan, 438107, China
通讯机构：
[Fang, X.] S;School of Life Science and Technology, Central South University of Forestry and Technology, Changsha, China
关键词：
湘中丘陵区;植被恢复;碳氮磷化学计量比;内稳态;养分利用效率;氮磷再吸收效率
摘要：
为揭示植被恢复过程中生态系统的养分循环机制及植物的生存策略,根据亚热带森林群落演替过程,采用空间代替时间方法,以湘中丘陵区地域相邻、环境条件基本一致的檵木(Loropetalum chinensis)+南烛(Vaccinium bracteatu)+杜鹃(Rhododendron mariesii)灌草丛(LVR)、檵木+杉木(Cunninghamia lanceolata)+白栎(Quercus fabri)灌木林(LCQ)、马尾松(Pinus massoniana)+柯(Lithocarpus glaber)+檵木针阔混交林(PLL)、柯+红淡比(Cleyera japonica)+青冈(Cyclobalanopsis Glauca)常绿阔叶林(LCC)作为一个恢复系列,设置固定样地,采集植物叶片、未分解层凋落物和0–30 cm土壤样品,测定有机碳(C)、全氮(N)、全磷(P)含量及其化学计量比,运用异速生长关系、养分利用效率和再吸收效率分析植物对环境变化的响应和养分利用策略。结果表明: (1)随着植被恢复,叶片C:N、C:P、N:P显著下降,而叶片C、N、P含量和土壤C、N含量、C:P、N:P显著增加,其中LCC植物叶片C、N含量,土壤C、N含量及其N:P, PLL植物叶片P含量,土壤C:P显著高于其他3个恢复阶段,各恢复阶段植物叶片N:P > 20,植物生长受P限制;凋落物C、N、P含量及其化学计量比波动较大。(2)凋落物与叶片、土壤的化学计量特征之间的相关关系较弱,叶片与土壤的化学计量特征之间具有显著相关关系,其中叶片C、N、P含量与土壤C、N含量、 C:N (除叶片C、N含量外)、C:P、N:P呈显著正相关关系;叶片C:N与土壤C、N含量、C:P、N:P,叶片C:P与土壤C含量、C:N、 C:P,叶片N:P与土壤C:N呈显著负相关关系。(3)植被恢复过程中,叶片N、P之间具有显著异速生长关系,异速生长指数为1.45,叶片N、P的利用效率下降,对N、P的再吸收效率增加, LCC叶片N利用效率最低, PLL叶片P利用效率最低而N、P再吸收效率最高。(4)叶片N含量内稳态弱,而P含量具有较高的内稳态,在土壤低P限制下植物能保持P平衡。植被恢复显著影响叶片、凋落物、土壤C、N、P含量及其化学计量比,叶片与土壤之间C、N、P含量及化学计量比呈显著相关关系,植物通过降低养分利用效率和提高养分再吸收效率适应土壤养分的变化,叶片-凋落物-土壤系统的N、P循环随着植被恢复逐渐达到“化学计量平衡”。
语种：
中文
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中亚热带植被恢复对土壤有机碳含量、碳密度的影响
作者：
辜翔;张仕吉;刘兆丹;李雷达;陈金磊;...
期刊：
植物生态学报 ,2018年42(5):595-608 ISSN：1005-264X
通讯作者：
Fang, X.
作者机构：
中南林业科技大学生命科学与技术学院,长沙,410004;[方晰] 中南林业科技大学生命科学与技术学院,长沙410004;[方晰] 南方林业生态应用技术国家工程实验室,长沙410004;[方晰] 湖南会同杉木林生态系统国家野外科学观测研究站,湖南会同438107;[刘兆丹; 辜翔; 李雷达; 张仕吉; 王留芳; 陈金磊] 中南林业科技大学
通讯机构：
[Fang, X.] S;School of Life Science and Technology, Central South University of Forestry and Technology, Changsha, China
关键词：
湘中丘陵区;植被恢复;灌草丛;灌木林;针阔混交林;常绿阔叶林;植被因子;土壤因子
摘要：
为揭示植被恢复对土壤有机碳(SOC)库的影响机制,采用空间代替时间的方法,以湘中丘陵区地域相邻、环境条件基本一致的檵木(Loropetalum chinense)-南烛(Vaccinium bracteatum)-杜鹃(Rhododendron simsii)灌草丛(LVR)、檵木-杉木(Cunninghamia lanceolata)-白栎(Quercus fabri)灌木林(LCQ)、马尾松(Pinus massoniana)-柯(又名石栎)(Lithocarpus glaber)-檵木针阔混交林(PLL)和柯-红淡比(Cleyera japonica)-青冈(Cyclobalanopsis glauca)常绿阔叶林(LAG)作为一个恢复演替序列,设置固定样地,采集0–10、10–20、20–30、30–40 cm土层土壤样品,测定不同恢复阶段SOC含量(C_(SOC))和SOC密度(D_(SOC)),通过主成分分析方法和逐步回归分析方法分析影响C_(SOC)、D_(SOC)变化的主要因子。结果表明:(1)各土层C_(SOC)、D_(SOC)随着植被恢复呈增加趋势,且LAG显著高于其他3个恢复阶段。LAG 0–40 cm土层C_(SOC)分别比LVR、LCQ、PLL增加12.5、9.3和4.7 g·kg~(–1),分别提高了248.5%、113.1%和58.5%; D_(SOC)分别增加67.1、46.1和32.5 t C·hm~(–2),分别提高了182.0%、79.7%和45.6%。(2) C_(SOC)、D_(SOC)与群落植物多样性指数、群落总生物量、地上部分生物量、根系生物量、凋落物层现存量、凋落物层全氮(N)含量、凋落物层全磷(P)含量、土壤全磷(TP)、土壤有效磷(AP)含量、土壤C/N(除C_(SOC)外)、C/P、N/P、<0.002 mm黏粒百分含量呈显著或极显著正相关关系,与凋落物层C/N(除D_(SOC)外)、凋落物层C/P、土壤pH值和土壤容重呈极显著负相关关系,表明C_(SOC)、D_(SOC)随着植被恢复的变化受到植被因子和土壤因子诸多因子的影响。其中,土壤C/P、土壤pH值和凋落物层C/P对C_(SOC)、D_(SOC)影响显著;此外, <0.002 mm黏粒百分含量也显著影响着D_(SOC),而土壤C/P对C_(SOC)和D_(SOC)影响最显著。植被恢复过程中,凋落物层C/P和土壤C/P、pH值、质地的变化是影响SOC库变化的重要因素。
语种：
中文
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亚热带森林土壤磷有效性及其影响因素的研究进展
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
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湘中丘陵区森林土壤酶活性的季节变化研究
作者：
庞威;方晰
期刊：
南方农机 ,2018年49(2):173-176 ISSN：1672-3872
作者机构：
[方晰; 庞威] 中南林业科技大学生命科学与技术学院,湖南 长沙,410000
关键词：
土壤酶活性;土壤肥力;季节变化;植被类型
摘要：
研究了湘中丘陵区人工杉木林（CL）、马尾松-石栎针阔混交林（PM）、南酸枣落叶阔叶林（CA）和石栎-青冈常绿阔叶林（LG）四种森林土壤养分特征和土壤酶活性的季节动态变化特征。研究结果表明,研究区土壤酶活性具有明显的季节变化特征且与植被类型密切相关。人工杉木林和马尾松-石栎针阔混交林土壤脲酶活性的季节变化表现为：秋季〉冬季〉夏季〉春季,南酸枣落叶阔叶林和石栎-青冈常绿阔叶林土壤脲酶活性的季节变化为：夏季〉秋季〉冬季≈春季,蔗糖酶为：夏季〉秋季≈冬季〉春季,酸性磷酸酶为：夏季〉春季≈秋季〉冬季,过氧化氢酶为：秋季〉春季〉夏季〉冬季。人工杉木林的四种土壤酶活性均低于其他三种次生林,表明了次生林土壤微生物活性要强于人工林。通过土壤酶活性和土壤养分的相关分析发现,土壤酶活性与土壤全N、水解N、全P、有效P含量均呈极显著的（p〈0.01）正相关性,土壤脲酶、蔗糖酶活性与土壤全K含量呈极显著负相关性,而酸性磷酸酶与全K含量呈极显著正相关。
语种：
中文
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人为干扰对中亚热带森林生物量及其空间分布格局的影响
作者：
李尚益;方晰;陈金磊;李雷达;辜翔;...
期刊：
生态学报 ,2018年38(17):6111-6124 ISSN：1000-0933
通讯作者：
Fang, X.
作者机构：
中南林业科技大学生命科学与技术学院,长沙,410004;[方晰] 中南林业科技大学生命科学与技术学院,长沙410004;[方晰] 湖南会同杉木林生态系统国家野外科学观测研究站,会同438107;[刘兆丹; 李尚益; 辜翔; 李雷达; 张仕吉; 陈金磊] 中南林业科技大学
通讯机构：
School of Life Science and Technology, Central South University of Forestry and Technology, Changsha, China
关键词：
湘中丘陵区;灌草丛;灌木林;针阔混交林;常绿阔叶林;物种多样性
摘要：
为揭示不同程度的人为干扰对中亚热带森林生物量及其空间分布格局的影响机制,在湘中丘陵区4种处于不同程度的人为干扰、地域相邻的植物群落:檵木-南烛-满山红灌草丛(LVR) 、檵木-杉木-白栎灌木林(LCQ) 、马尾松-石栎-檵木针阔混交林(PLL) 、石栎-红淡比-青冈常绿阔叶林(LAG)设置固定样地,结合植物群落调查,采用收获法和建立主要树种各器官生物量相对生长方程,测定和估算群落生物量。结果表明: (1)随着人为干扰程度减弱,群落总生物量呈显著的指数函数增长(P<0.05) ,地上部分、地下部分生物量表现为异速生长,LAG与PLL乔木层生物量差异不显著(P>0.05) ,4个群落灌木层生物量及其各器官、地上部分、地下部分生物量均呈先增加后下降的变化特征,草本层生物量及其地上部分、地下部分生物量先下降再增高,凋落物层现存量总体上呈增加趋势; (2)不同程度的人为干扰,群落生物量的空间分布格局不同,LVR群落灌木层、草本层生物量相当,LCQ群落灌木层生物量占明显优势,草本层生物量下降,PLL和LAG群落乔木层生物量占绝对优势,灌木层、草本层和凋落物层生物量占群落总生物量低于10%; (3)群落总生物量与树种多样性指数呈显著的正相关(P<0.05) ,与土壤有机碳、全氮、水解氮、有效磷含量呈显著的正相关(P<0.05) ,表明不同程度的人为干扰造成群落树种多样性、土壤养分含量的变化,是导致群落生物量变化的主要因素。
语种：
中文
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中亚热带退化林地土壤有机碳及不同粒径土壤颗粒有机碳的变化
作者：
王娜;朱小叶;方晰;辜翔;陈金磊
期刊：
水土保持学报 ,2018年32(3):218-225,234 ISSN：1009-2242
作者机构：
中南林业科技大学生命科学与技术学院, 长沙, 410004;湖南会同杉木林生态系统国家野外科学观测研究站, 湖南会同杉木林生态系统国家野外科学观测研究站, 湖南, 会同, 438107;[王娜; 朱小叶; 辜翔; 陈金磊] 中南林业科技大学生命科学与技术学院, 长沙, 410004;[方晰] 中南林业科技大学生命科学与技术学院, 长沙, 410004 湖南会同杉木林生态系统国家野外科学观测研究站, 湖南会同杉木林生态系统国家野外科学观测研究站, 湖南, 会同, 438107
关键词：
林地退化;土壤有机碳;湘中丘陵区
摘要：
采用土壤颗粒分级方法,以湘中丘陵区地域相邻、环境条件基本一致的4种林地:檵木—南烛—满山红灌草丛(LVR)、檵木—杉木—白栎灌木林(LCQ)、马尾松—石栎—檵木针阔混交林(PLL)和石栎-红淡比-青冈常绿阔叶林(LAG)为对象,研究土壤有机碳(SOC)及不同粒径土壤颗粒有机碳含量随着林地退化的变化特征,剖析林地退化对中亚热带森林SOC库的影响机制。结果表明:随着林地退化,>2μm砂粉粒百分含量增高,而<2μm黏粒百分含量下降,土壤质地粗砂化;林地SOC含量呈负指数函数下降,LAG林地SOC库以粉粒、黏粒有机碳为分配主体,PLL、LCQ、LVR林地以粉粒、砂粒有机碳为分配主体;随着林地退化,同一土层同一粒径有机碳含量呈下降趋势,砂粒有机碳含量的分配比例明显增加,黏粒有机碳含量的分配比例明显下降,同一土层颗粒有机碳(POC)/矿物结合有机碳(MOC)值增加,SOC固持和保护作用减弱,SOC稳定性下降。群落物种组成、生物量和土壤颗粒组成随着林地退化的变化是导致林地SOC含量和稳定性下降的主要因素。
语种：
中文
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湖南东部植被恢复对土壤有机碳矿化的影响
作者：
辜翔;张仕吉;刘兆丹;李雷达;陈金磊;...
期刊：
植物生态学报 ,2018年42(12):1211-1224 ISSN：1005-264X
通讯作者：
Fang, X.
作者机构：
中南林业科技大学生命科学与技术学院,长沙,410004;[方晰] 中南林业科技大学生命科学与技术学院,长沙410004;[方晰] 南方林业生态应用技术国家工程实验室,长沙410004;[方晰] 湖南会同杉木林生态系统国家野外科学观测研究站,湖南会同438107;[刘兆丹; 辜翔; 李雷达; 张仕吉; 王留芳; 陈金磊] 中南林业科技大学
通讯机构：
[Fang, X.] S;School of Life Science and Technology, Central South University of Forestry and Technology, Changsha, China
关键词：
中亚热带地区;植被恢复;有机碳矿化;植被因子;土壤因子
摘要：
为阐明中亚热带植被恢复对土壤有机碳(SOC)稳定性的影响机制,采用空间代替时间方法,在湘东丘陵区选取檵木(Loropetalum chinense)-南烛(Vaccinium bracteatum)-杜鹃(Rhododendron simsii)灌草丛(LVR)、檵木-杉木(Cunninghamia lanceolata)-白栎(Quercus fabri)灌木林(LCQ)、马尾松(Pinus massoniana)-柯(Lithocarpus glaber)-檵木针阔混交林(PLL)、柯-红淡比(Cleyera japonica)-青冈(Cyclobalanopsis glauca)常绿阔叶林(LAG)作为一个恢复系列,采用室内恒温培养(碱液吸收法)测定SOC矿化速率及其累积矿化量(C_m),结合主成分和逐步回归方法分析C_m、SOC矿化率与植被因子和土壤因子的关系。结果表明: (1)不同植被恢复阶段SOC矿化速率随着培养时间呈现基本一致的变化趋势,培养初期矿化速率较高,且快速下降,培养中后期缓慢下降并趋于平稳,倒数方程能很好地拟合不同植被恢复阶段SOC矿化速率与培养时间的关系。(2)植被恢复显著提高各土层SOC矿化速率和C_m, LAG显著高于其他3个植被恢复阶段, LAG 0–40 cm土层C_m比LVR、LCQ、PLL分别高出359.06%–716.31%、112.38%–232.61%、94.40%–105.74%。(3) 4种植被恢复阶段0–10、10–20、20–30、30–40 cm土层SOC矿化率分别为2.13%–4.99%、3.42%–4.18%、4.05%–4.64%、4.02%–5.64%,但不同植被恢复阶段之间差异不显著。(4)植被恢复过程中, C_m的变化主要受土壤全氮(TN)含量、根系生物量的驱动,土壤TN含量、根系生物量可分别解释C_m变异的96.9%、 0.9%。而土壤C:N是SOC矿化率的主要调控因子,可单独解释SOC矿化率变异的49.4%。表明植被恢复促进了SOC矿化,降低了SOC中矿化C的比例,有利于提高土壤固C能力;随着植被恢复,土壤TN含量和根系生物量增加是影响C_m的主要因子,而土壤SOC的质量差异是影响SOC矿化率的主要因子。
语种：
中文
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Effects of Forest Restoration on Soil Carbon, Nitrogen, Phosphorus, and Their Stoichiometry in Hunan, Southern China
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
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Spatial variations in soil organic carbon, nitrogen and phosphorus concentrations related to stand characteristics in subtropical areas
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
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Tree growth traits and social status affect the wood density of pioneer species in secondary subtropical forest
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
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Stoichiometric and nutrient resorption characteristics of dominant tree species in subtropical Chinese forests
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
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Tree functional types simplify forest carbon stock estimates induced by carbon concentration variations among species in a subtropical area
作者：
Wu, Huili;Xiang, Wenhua* ;Fang, Xi;Lei, Pifeng;Ouyang, Shuai;...
期刊：
Scientific Reports ,2017年7(1):4992 ISSN：2045-2322
通讯作者：
Xiang, Wenhua
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：
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 (P < 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.
语种：
英文
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Interannual variation in methane emissions from tropical wetlands triggered by repeated El Niño Southern Oscillation
作者：
Zhu, Qiuan* ;Peng, Changhui* ;Ciais, Philippe;Jiang, Hong;Liu, Jinxun;...
期刊：
Global Change Biology ,2017年23(11):4706-4716 ISSN：1354-1013
通讯作者：
Zhu, Qiuan;Peng, Changhui
作者机构：
[Peng, Changhui; Wang, Meng; Zhu, Qiuan; Li, Shiqin; Wang, Han] Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Peoples R China.;[Zhou, Xiaolu; Peng, Changhui; Fang, Xiuqin; Zhu, Qiuan; Chen, Huai] Univ Quebec, Dept Biol Sci, Ctr CEF ESCER, Montreal, PQ, Canada.;[Bousquet, Philippe; Ciais, Philippe] Univ Paris Saclay, CEA CNRS UVSQ IPSL, LSCE, Gif Sur Yvette, France.;[Jiang, Hong] Nanjing Univ, Int Inst Earth Syst Sci, Nanjing, Jiangsu, Peoples R China.;[Liu, Jinxun] US Geol Survey, Western Geog Sci Ctr, 345 Middlefield Rd, Menlo Pk, CA 94025 USA.
通讯机构：
[Zhu, Qiuan] N;[Peng, Changhui] U;Northwest A&F Univ, State Key Lab Soil Eros & Dryland Farming Loess P, Yangling, Peoples R China.;Univ Quebec, Dept Biol Sci, Ctr CEF ESCER, Montreal, PQ, Canada.
关键词：
atmospheric methane;El Nino-Southern Oscillation;methane emission;tropical wetlands
摘要：
Methane (CH4) emissions from tropical wetlands contribute 60%–80% of global natural wetland CH4 emissions. Decreased wetland CH4 emissions can act as a negative feedback mechanism for future climate warming and vice versa. The impact of the El Niño–Southern Oscillation (ENSO) on CH4 emissions from wetlands remains poorly quantified at both regional and global scales, and El Niño events are expected to become more severe based on climate models’ projections. We use a process-based model of global wetland CH4 emissions to investigate the impacts of the ENSO on CH4 emissions in tropical wetlands for the period from 1950 to 2012. The results show that CH4 emissions from tropical wetlands respond strongly to repeated ENSO events, with negative anomalies occurring during El Niño periods and with positive anomalies occurring during La Niña periods. An approximately 8-month time lag was detected between tropical wetland CH4 emissions and ENSO events, which was caused by the combined time lag effects of ENSO events on precipitation and temperature over tropical wetlands. The ENSO can explain 49% of interannual variations for tropical wetland CH4 emissions. Furthermore, relative to neutral years, changes in temperature have much stronger effects on tropical wetland CH4 emissions than the changes in precipitation during ENSO periods. The occurrence of several El Niño events contributed to a lower decadal mean growth rate in atmospheric CH4 concentrations throughout the 1980s and 1990s and to stable atmospheric CH4 concentrations from 1999 to 2006, resulting in negative feedback to global warming. © 2017 John Wiley & Sons Ltd
语种：
英文
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湖南省2014年森林植被碳储量、碳密度及其区域空间分布格局
作者：
李雷达;方晰;李斌;刘兆丹
期刊：
中南林业科技大学学报 ,2017年37(1):69-77 ISSN：1673-923X
作者机构：
中南林业科技大学生命科学与技术学院, 湖南, 长沙, 410004;中南林业科技大学生命科学与技术学院, 南方林业生态应用技术国家工程实验室, 湖南, 长沙, 410004;[李雷达; 李斌; 刘兆丹] 中南林业科技大学生命科学与技术学院, 湖南, 长沙, 410004;[方晰] 中南林业科技大学生命科学与技术学院, 南方林业生态应用技术国家工程实验室, 湖南, 长沙, 410004
关键词：
森林植被;碳储量;碳密度;区域空间分布;湖南省
摘要：
为明晰湖南省现有森林植被碳储量区域分布格局,基于湖南省2014年森林资源年度统计数据,结合材积源生物量法估算了湖南省现有森林植被碳储量、碳密度及其区域空间分布格局。结果表明:(1)湖南省乔木林植被碳储量为145.23×10~6 t,其中阔叶林植被碳储量占47.52%,幼龄林和中龄林植被碳储量之和占69.49%;湖南省乔木林植被平均碳密度为16.26 t·hm~(-2)。(2)湖南省现有森林植被碳储量为196.95×10~6 t,其中乔木林植被碳储量占73.73%,湖南省现有森林植被平均碳密度为16.31 t·hm~(-2),比1995年湖南省森林植被碳密度提高了1.16 t·hm~(-2)。(3)湖南省现有森林植被碳储量、碳密度区域空间分布格局不一致,碳储量呈现出湘西南怀化、邵阳和湘南永州、郴州较高,而碳密度则呈现出益阳、常德、邵阳、郴州较高。森林植被碳储量较高地区,通过封山育林保护措施稳定和提高该区域森林碳储量;而碳储量较低的地区,通过增加地带性树种,优化林分结构组成,提高该区域森林碳储量。
语种：
中文
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Allometric Equations for Applying Plot Inventory and Remote Sensing Data to Assess Coarse Root Biomass Energy in Subtropical Forests
作者：
Gou, Mengmeng;Xiang, Wenhua* ;Song, Tongqing;Lei, Pifeng;Zhang, Shengli;...
期刊：
BioEnergy Research ,2017年10(2):536-546 ISSN：1939-1234
通讯作者：
Xiang, Wenhua
作者机构：
[Ouyang, Shuai; Lei, Pifeng; Gou, Mengmeng; Xiang, Wenhua; Zeng, Yelin; Fang, Xi; Deng, Xiangwen] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, 498 Southern Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.;[Ouyang, Shuai; Lei, Pifeng; Gou, Mengmeng; Xiang, Wenhua; Fang, Xi; Zhang, Shengli; Deng, Xiangwen] Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong 438107, Hunan, Peoples R China.;[Song, Tongqing; Wang, Kelin] Chinese Acad Sci, Inst Subtrop Agr, Key Lab Agroecol Proc Subtrop Reg, Changsha 410125, Hunan, Peoples R China.;[Song, Tongqing; Wang, Kelin] Chinese Acad Sci, Huanjiang Observat & Res Stn Karst Ecosyst, Huanjiang 547100, Peoples R China.
通讯机构：
[Xiang, Wenhua] C;[Xiang, Wenhua] H;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, 498 Southern Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.;Huitong Natl Stn Sci Observat & Res Chinese Fir P, Huitong 438107, Hunan, Peoples R China.
关键词：
Coarse root biomass;Bioenergy;Allometric equations;Functional groups;Remote sensing;Subtropical forests
摘要：
Coarse root biomass (CRB) is an important store of carbon (C) and forest residue for renewable energy, but is often overlooked due to the lack of a simple and effective way to estimate its magnitude. In this study, we developed allometric equations for three functional groups using data from 133 tree samples, with a diameter at breast height (DBH) ranging from 2.6 to 52.0 cm. The functional groups included evergreen coniferous (Pinus massoniana), deciduous broad-leaved (Alniphyllum fortunei, Choerospondias axillaris, Liquidambar formosana and Quercus fabri) and evergreen broad-leaved (Castanopsis carlesii, Cyclobalanopsis glauca, Litsea coreana and Schima superba) species. Allometric equations that related CRB to plot inventory data (e.g. DBH or tree height (H)) and their combinations significantly fitted (P < 0.0001) for the functional groups and all tree species. The equations using DBH or DBH-H as predictor variables were the best fit (R<sup>2</sup> ≥ 0.90) and produced good predictions with little bias (less than 21%) for local sites and at regional scales. Allometric equations related to easily obtained remote sensing data (i.e. crown width (CW) and H) were also significantly fitted (P < 0.0001, R<sup>2</sup> ≥ 0.76), and predictions were close to the observed CRB, despite a high bias (larger than 98.0%). In conclusion, the use of these equations to estimate CRB is essential to the harvest process and helps to formulate new policies for managing the feedstock supply to bioenergy production in subtropical forests. ©2017, Springer Science+Business Media New York.
语种：
英文
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中亚热带土地利用方式对土壤易氧化有机碳及碳库管理指数的影响
作者：
张仕吉;项文化;孙伟军;方晰
期刊：
生态环境学报 ,2016年25(6):911-919 ISSN：1674-5906
作者机构：
中南林业科技大学材料科学与工程学院, 湖南, 长沙, 410004;中南林业科技大学生命科学与技术学院, 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;[张仕吉] 中南林业科技大学材料科学与工程学院, 湖南, 长沙, 410004;[项文化; 方晰] 中南林业科技大学生命科学与技术学院, 南方林业生态应用技术国家工程实验室, 湖南, 长沙, 410004
关键词：
湘中丘陵区;土地利用方式;易氧化有机碳;次生林;碳库管理指数
摘要：
为了解土地利用方式对中亚热带土壤易氧化有机碳(ROC)及碳库管理指数(CMI)的影响,采用KMnO_4氧化法,对湘中丘陵区6种土地利用类型:石栎(Lithocarpus glaber)-青冈(Cyclobalanopsis glauca)次生林、杉木(Cunninghamia lanceolata)人工林、毛竹(Phyllostachys edulis)林、苗圃、农用旱地、水田土壤ROC含量及其季节动态变化进行测定,以石栎-青冈次生林土壤为参照,计算土壤CMI,分析土壤ROC含量、CMI与土壤理化性状的关系。结果表明,同一土层ROC含量、ROC分配比例在不同土地利用类型之间差异显著,ROC含量表现为石栎-青冈次生林>毛竹林>水田>杉木人工林>农用旱地>苗圃,ROC分配比例为水田>石栎-青冈次生林>毛竹林>农用旱地>苗圃>杉木人工林;与石栎-青冈次生林相比,毛竹林、水田、杉木人工林、农用旱地、苗圃土壤ROC含量依次下降了9.8%~15.6%、22.0%~36.3%、27.6%~40.1%、47.4%~51.2%、58.0%~65.5%,水田、毛竹林、杉木人工林、农用旱地、苗圃土壤CMI依次下降了11.6%~18.4%、9.1%~20.9%、40.0%~44.1%、48.6%~51.5%和59.3%~66.6%;6种土地利用类型土壤ROC含量的季节变化节律基本一致,表现为春夏季较秋冬季高,夏季最高,冬季或秋季最低;土壤ROC含量、CMI与土壤SOC、全N、全P、水解N、有效P含量之间呈显著或极显著正相关,与土壤pH呈极显著负相关,与土壤含水率、全K、速效K不相关。土地利用方式对土壤ROC含量、CMI影响显著,次生林转变为人工林或农用地后,土壤碳库稳定性和生物可利用性下降。
语种：
中文
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土地利用方式对中亚热带山地土壤微生物生物量磷的影响
作者：
李胜蓝;方晰;李岩;项文化;张仕吉
期刊：
西北农林科技大学学报(自然科学版) ,2016年44(8):162-170 ISSN：1671-9387
作者机构：
[方晰; 李胜蓝; 项文化; 李岩] 中南林业科技大学生命科学与技术学院,湖南长沙410004;[方晰; 李胜蓝; 项文化; 李岩] 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;中南林业科技大学材料科学与工程学院,湖南长沙,410004;[张仕吉] 中南林业科技大学
关键词：
中亚热带;土地利用方式;山地土壤;微生物生物量磷
摘要：
【目的】研究中亚热带山地不同土地利用方式土壤微生物生物量磷(MBP)的含量特征。【方法】在地处中亚热带地区的湖南长沙大山冲选取6种土地利用方式(杉木人工林、次生林(马尾松+石栎针阔混交林、南酸枣落叶阔叶林、石栎+青冈常绿阔叶林)、毛竹林和弃荒地)的样地,分别采集其0~15 cm和15~30 cm土层土壤样品,测定其MBP、全磷(TP)、有效磷(AP)、有机碳(SOC)、全氮(TN)含量,并测定样地的凋落物量和细根生物量,分析MBP与土壤养分(C、N、P)、凋落物量、细根生物量之间的关系。【结果】(1)6种土地利用方式土壤MBP含量均表现为0~15 cm土层高于15~30 cm土层,不同土地利用方式土壤MBP含量差异显著,毛竹林最高,杉木人工林最低。 (2)同一土层,不同土地利用方式土壤TP、AP含量差异显著,弃荒地、毛竹林较高,杉木人工林最低。(3)不同土地利用方式土壤MBP占TP含量百分比差异显著,毛竹林最高,其次是次生林、弃荒地,杉木人工林最低。(4)整个研究区土壤MBP与SOC、TN含量呈极显著正相关,与TP、AP不存在显著的相关性,杉木人工林、次生林土壤MBP与SOC、TP、AP含量呈显著或极显著正相关,但与凋落物量、细根生物量相关性不显著。【结论】不同土地利用方式土壤TP、SOC、TN含量的差异是导致土壤MBP含量差异的主要因素,人为活动(如施肥、耕作措施)是导致土壤MBP含量差异的直接因子之一。
语种：
中文
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亚热带4种林分类型枯落物层和土壤层的碳氮磷化学计量特征
作者：
喻林华;方晰;项文化;石俊;刘兆丹;...
期刊：
林业科学 ,2016年52(10):10-21 ISSN：1001-7488
通讯作者：
Fang, Xi
作者机构：
[方晰; 刘兆丹; 项文化; 石俊; 李雷达; 喻林华] Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, 410004, China;[方晰; 项文化] National Engineering Laboratory for Applied Technology of Forest &, Ecology in South China, Changsha, 410004, China
通讯机构：
Faculty of Life Science and Technology, Central South University of Forestry and Technology, Changsha, China
关键词：
养分含量;地表枯落物;分解层;生态化学计量比;杉木;人工林;次生林
摘要：
【目的】探讨亚热带森林恢复过程中枯落物层和土壤层的C,N,P含量及其化学计量比的变化规律,为阐明亚热带次生林恢复对土壤养分的影响及森林恢复提供科学依据。【方法】采用空间代替时间的方法,以湘中丘陵区杉木人工纯林、马尾松+ 石栎针阔混交林、南酸枣落叶阔叶林和石栎+ 青冈常绿阔叶林作为1个恢复系列,分别在其1 hm~2的长期定位观测样地内,沿着坡面选择6块10 m × 10 m小样地,每块小样地随机设置2个1.0 m × 1.0 m样方,采集地表未分解层、半分解层、已分解层枯落物和0 ~ 10,1 0 ~ 20和20 ~ 30 cm土层土壤样品,测定C,N,P含量并计算C,N,P的化学计量比。【结果】随着森林恢复和阔叶树比例增大,同一分解层枯落物C含量呈下降趋势,而N和P(除已分解层外) 含量大体呈增加趋势; C含量随枯落物分解而下降; 马尾松+石栎针阔混交林N含量表现为半分解层> 已分解层> 未分解层,杉木人工林、南酸枣落叶阔叶林、石栎+ 青冈常绿阔叶林表现为半分解层> 未分解层> 已分解层; 南酸枣落叶阔叶林P含量表现为未分解层> 半分解层> 已分解层,杉木人工林、马尾松+ 石栎针阔混交林和石栎+ 青冈常绿阔叶林均表现为半分解层最高,已分解层最低(除马尾松+ 石栎针阔混交林外); 同一分解层枯落物C∶ N、C∶ P和N∶ P比值随森林恢复而下降; C∶ N、C∶ P比值随枯落物分解而下降,N∶ P比值无明显变化规律; 同一土层C,N,P含量随森林恢复而增加; 4种林分0 ~ 30 cm土壤层C∶ N和C∶ P平均比值变化趋势基本一致,石栎+ 青冈常绿阔叶林最高,其次是马尾松+ 石栎针阔混交林,杉木人工林最低; 4种林分0 ~ 30 cm土壤层N∶ P平均比值无显著差异; 未分解层枯落物C含量与0 ~ 10和0 ~ 30 cm土层C,N,P含量显著负相关,而N,P含量与0 ~ 10和0 ~ 30 cm土壤层C,N(除N外), P含量显著正相关; 未分解层枯落物C∶ N、C∶ P和N∶ P比值与0 ~ 10和0 ~ 30 cm土壤层C(除N∶ P比值外), N,P含量显著负相关; 枯落物层C∶ N、C∶ P和N∶ P比值与土壤层C∶ N、C∶ P和N∶ P比值相关性不显著。【结论】随着森林恢复,阔叶树比例增大,枯落物层C∶ N、C∶ P和N∶ P比值逐渐下降,土壤层C,N,P含量增加,未分解层枯落物C,N,P含量及其化学计量比对土壤层C,N,P含量影响显著。在森林恢复和森林经营过程中,如何调整林分树种组成,改变枯落物层的质量显得十分关键。
语种：
中文
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中亚热带4种森林土壤碳、氮、磷化学计量特征
作者：
彭晓;方晰;喻林华;项文化;黄志宏
期刊：
中南林业科技大学学报 ,2016年36(11):65-72 ISSN：1673-923X
作者机构：
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; 黄志宏] 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; 黄志宏] 南方林业生态应用技术国家工程实验室,湖南长沙410004;[彭晓; 喻林华] 中南林业科技大学
关键词：
中亚热带森林;土壤养分;生态化学计量比;相关性分析
摘要：
以湘中丘陵区杉木人工林(CL)、马尾松一石栎针阔混交林(PM)、南酸枣落叶阔叶林(CA)、石栎—青冈常绿阔叶林(LG)为对象,研究了中亚热带森林土壤有机碳(SOC)、全氮(TN)、全磷(TP)含量及其生态化学计量特征。结果表明:同一土层SOC、TN、TP含量随着森林树种增加而增加,LG、CA 0 ~ 30 cm土层SOC平均含量显著高于CL,但与PM差异不显著,CA各土壤层TN平均含量均显著高于CL、PM,但与LG差异不显著,CA各土壤层TP平均含量显著高于CL、PM、LG; 4种森林土壤SOC、TN含量随土壤深度增加而下降,呈“倒金字塔”的分布模式,但TP含量随土壤深度变化不明显,呈“圆柱体”的分布模式。LG各土壤层C:N、C:P平均比值最高,其次是PM,CA、CL最低,但4种森林同一土层N: P平均比值差异不显著,4种森林0 ~ 30 cm土层的C: N: P平均比值均明显高于我国土壤C: N: P比值的平均值(60: 5: 1),C: N、C: P、N: P比值均随土壤深度增加而下降,不同森林之间的差异也随土壤深度增加而减弱。土壤SOC、TN、TP相互之间的耦合关系显著,C: N、C: P比值主要受土壤SOC含量的影响,N: P比主要受到土壤SOC、TN含量的影响,土壤C: P比对土壤C: N、N: P比值影响显著。
语种：
中文
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Prediction of tree species composition in fine root mixed samples using near-infrared reflectance spectroscopy
作者：
Tong, J.;Xiang, W.* ;Lei, P.;Liu, J.;Tian, D.;...
期刊：
PLANT BIOSYSTEMS ,2016年150(3):412-419 ISSN：1126-3504
通讯作者：
Xiang, W.
作者机构：
[Peng, C.; Tong, J.; Xiang, W.; Tian, D.; Liu, J.; Lei, P.; Fang, X.; Deng, X.] Cent South Univ Forestry & Technol, Fac Life Sci & Technol, 498 Southern Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.;[Peng, C.] Univ Quebec, Dept Biol Sci, Inst Environm Sci, Montreal, PQ H3C 3P8, Canada.
通讯机构：
[Xiang, W.] C;Cent South Univ Forestry & Technol, Fac Life Sci & Technol, 498 Southern Shaoshan Rd, Changsha 410004, Hunan, Peoples R China.
关键词：
Belowground interaction;fine roots;near-infrared reflectance spectroscopy;subtropical forests;tree species composition
摘要：
Fine roots ( ≤ 2 mm diameter) are of great value when investigating belowground interactions among different plant species and soil nutrient cycling in forest ecosystems. However, fine root separation and species identification are labor-intensive and time-consuming processes. This study aimed to evaluate the aptitude of near-infrared reflectance spectroscopy (NIRS) in predicting tree species composition in fine root mixed samples. The coniferous species Cunninghamia lanceolata and Pinus massoniana, the deciduous species Alniphyllum fortunei and Liquidambar formosana, and the evergreen broadleaved species Cyclobalanopsis glauca represent the five subtropical tree species selected for this investigation. To obtain near-infrared reflectance spectral data, 20 samples taken in the field and 70 artificially mixed samples of the five species were produced after root samples were oven-dried and ground. Calibration was performed with partial least squares regression and leave-one-out cross-validation. Root mass proportions of the mixed samples showed good predictive capacity for C. lanceolata, P. massoniana, and C. glauca with low root mean square error of prediction ( < 6.82%) and high determination coefficients (R2>0.944). Predictions for A. fortunei and L. formosana were acceptable with R2>0.819. NIRS shows potential in predicting tree species composition with suitable accuracy. © 2014 Società Botanica Italiana.
语种：
英文
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