Exogenous and endogenous determinants of spatial aggregation patterns in tibetan Plateau meadow vegetation  

作　　者：Jiajia Liu Deyan Wu Xiaoyu Peng Shurong Zhou Corey J.A.Bradshaw 

机构地区：[1]Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering,School of life Sciences,Fudan University,Shanghai 200433,China [2]State Key Laboratory of Grassland Agro-ecosystems,School of Life Sciences,Lanzhou University,Lanzhou 730000,China [3]The Environment Institute and School of Earth and Environmental Sciences,The University of Adelaide,South Australia 5005,Australia [4]South Australian Research and Development Institute,PO Box 120,Henley Beach,South Australia 5022,Australia

出　　处：《Journal of Plant Ecology》2013年第4期277-285,共9页植物生态学报（英文版）

基　　金：National Natural Science Foundation of China(31170355 and 30970543);Specialized Research Fund for the Doctoral Program of Higher Education.Sun Yat-sen University,Guangzhou,China to C.J.A.B.

摘　　要：Aims We aim to quantify the relative importance of various endogenous and exogenous processes influencing the spatial distribution of the individuals of plant species at different temporal and spatial scales in a species-rich and high-cover meadow in the eastern tibetan Plateau.Methods We calculated green’s index of dispersion to infer the spatial dis-tribution patterns of 73 herbaceous species at two scales(0.25 and 1.0 m2).We constructed a series of generalized linear models to test the hypotheses that different species traits such as mean plant stem density,per capita dry biomass,maximum plant height and mean seed mass contribute to their spatial distribution.We used the first principal component of soil C,N and P to explain abundance vari-ation across quadrats and sub-plots.Important Findingsthe individuals of the species studied were highly spatially aggregated.at both spatial scales,biomass and stem density explained the most variation in aggregation,but there was no evidence for an effect of mean seed mass on aggregation intensity.the effects of soil carbon,nitrogen and phosphorus at different depths affected plant abundance mostly at the broader spatial scale.our results demonstrate that self-thinning and habitat heterogeneity all contribute to determine the spatial aggregation patterns of plant individuals in alpine meadow vegetation in the eastern tibetan Plateau.

关 键 词：alpine meadow COMMUNITY dispersal limitation habitat heterogeneity SELF-THINNING 

分 类 号：Q94[生物学—植物学]