桂林岩溶石山青冈群落植物功能多样性和环境因子与坡向的关联研究  

Changes in plant functional diversity and environmental factors of Cyclobalanopsis glauca community in response to slope gradient in Karst hills,Guilin

作　　者：盘远方 李娇凤 姚玉萍 姜勇 利恒春[1,2] 王晓凤 卢国琼[1,2] 杨晨 黄诗雯 蒋文平 PAN Yuanfang;LI Jiaofeng;YAO Yuping;JIANG Yong;LI Hengchun;WANG Xiaofeng;LU Guoqiong;YANG Chen;HUANG Shiwen;JIANG Wenping(Key Laboratory of Wild Animal and Plant Ecology Guangxi Colleges and Universities,Guangxi Normal University,Guilin 541006,China;College of Life Sciences,Guangxi Normal University,Guilin 541006,China)

机构地区：[1]广西高校野生动植物生态学重点实验室,广西师范大学,桂林541006 [2]广西师范大学生命科学学院,桂林541006

出　　处：《生态学报》2021年第11期4484-4492,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金(31860124);2020年广西高校大学生创新创业计划项目(202010602054,202010602253)。

摘　　要：研究群落水平上的植物功能多样性和环境因子与不同坡向(阴坡、阳坡)的关联,有助于理解不同坡向上植物群落的形成过程及其构建机制。本研究以桂林岩溶石山不同坡向上的青冈群落为研究对象,分析阴坡、阳坡植物功能多样性指数和环境因子的变化规律及植物功能多样性指数与环境因子的相关性。研究结果表明:(1)不同坡向上的功能丰富度、功能均匀度、功能离散度和功能分离度指数均具有显著的差异,且均表现为阴坡大于阳坡。(2)不同坡向上的土壤全磷含量、岩石裸露率和土壤有效磷含量均具有显著的差异,土壤全磷含量表现为阴坡大于阳坡,而岩石裸露率和土壤有效磷含量表现为阳坡大于阴坡。(3)多元逐步回归分析结果表明,在阴坡上功能离散度和功能分离度分别与岩石裸露率呈显著的负相关,而在阳坡上其相关性不显著;在阳坡上功能均匀度与土壤全磷含量、功能分离度与土壤有效磷含量呈显著的正相关,而在阴坡上其相关性不显著。Functional diversity of a plant community,which is based on plants traits,has been proposed as a key component predicting ecosystem function.Studying the difference between plant functional diversity at community level and environmental factors along with the sloped(shady-sunny)gradient is helpful to explore the process of plant community and the mechanism of community construction.In this study,we caculated four functional diversity indexes including functional richness(FRic),functional evenness(FEve),functional dispersion(FDis),functional divergence(FDiv)based on two plant functional traits(i.e.specific leaf area,SLA and wood density,WD)and three environmental factors(rock exposure rate:RER,soil total phosphorus:TP,and soil available phosphorus:AP)in typical Cyclobalanopsis glauca communities and examined the correlation between changes in this relationship and slope gradient in the Karst hills of Guilin.Experiments were carried out at 14 sampling points with gradients sloping from the middle area of the hills to the foot of the hills(shady-sunny).In total,14 plots(20 m×20 m)were sampled.Individuals of tree with DBH≥1 were identified,and two plant functional traits of these plants and three soil environmental factors of each plot were measured.Then we calculated four functional diversity indexes based on two SLA and WD.Next we preformed non⁃parametric Wilcoxon signed rank test to assess differences in the four plant functional diversity indexes and in three environmental factors along the slope gradient.Based on the results of this analysis,we used multiple stepwise regression analysis to determine the key soil factors controlling variation in plant functional diversity indexes at the community in relation to slope gradient.We observed that:(1)the functional richness,functional evenness,functional dispersion,and functional divergence in shady areas of the slope were significantly greater than those in sunny areas of the slope.(2)Rock exposure rate and soil available phosphorus in sunny areas of the slope w

关 键 词：青冈群落 功能多样性 环境因子 坡向 岩溶石山 

分 类 号：Q948.1[生物学—植物学]