Ecological responses of Primula nutans to centimeter-scale topographic and environmental variability in an alpine wetland |
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Authors: | Haihua Shen Yanhong Tang Izumi Washitani |
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Institution: | (1) Department of Ecosystem Studies, Institute of Agriculture and Life Science, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;(2) Environmental Biology Division, National Institute for Environmental Studies, Onogawa 16-2, Tsukuba, Ibaraki 305-8506, Japan |
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Abstract: | Primula nutans Georgi is a herbaceous species broadly distributed in wetlands on the Qinghai–Tibetan Plateau. These wetlands are often spatially
highly heterogeneous because of their hummock-and-hollow microtopography. To address how P. nutans can be so broadly distributed on these wetlands, we examined ramet distribution, abundance, and growth performance in environmentally
variable microsites at the centimeter scale. P. nutans showed significantly higher ramet density on the south-orientated microsites than on the north-orientated microsites. With
increasing relative microsite elevation on the hummocks, ramet density increased significantly, but individual leaf area decreased
significantly. Principle component analysis and multiple regression analysis indicated that microsites at higher elevations
tend to have higher light availability and higher ramet density. The study suggests that P. nutans shows high plasticity in the distribution, abundance, and growth performance in response to the microtopography at the centimeter
scale, which may contribute to the broad distribution of the species in the hummock-and-hollow wetlands in harsh alpine environments
on the Tibetan Plateau. |
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Keywords: | Alpine plants Distribution Microtopography Spatial heterogeneity Wetland |
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