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|Title:||Exogenous and endogenous determinants of spatial aggregation patterns in Tibetan Plateau meadow vegetation|
|Citation:||Journal of Plant Ecology, 2013; 6(4):277-285|
|Publisher:||Oxford University Press|
|Jiajia Liu, Deyan Wu, Xiaoyu Peng, Shurong Zhou, and Corey J. A. Bradshaw|
|Abstract:||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 distribution 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 variation across quadrats and sub-plots. Important Findings: The 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.|
|Keywords:||alpine meadow; community; dispersal limitation; habitat heterogeneity; self-thinning|
|Rights:||© The Author 2012. Published by Oxford University Press on behalf of the Institute of Botany, Chinese Academy of Sciences and the Botanical Society of China. All rights reserved.|
|Appears in Collections:||Environment Institute publications|
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