Impact of seasonal water-level fluctuations on autumn vegetation in Poyang Lake wetland,China  

作　　者：Xue DAI Rongrong WAN Guishan YANG Xiaolong WANG Ligang XU Yanyan LI Bing LI 

机构地区：[1]Key Laboratory of Watershed Geographic Sciences,Nanjing Institute of Geography and Limnology,Chinese Academy of Sciences,Nanjing 21000& China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Jiangsu Second Normal University,Nanjing 210013,China

出　　处：《Frontiers of Earth Science》2019年第2期398-409,共12页地球科学前沿（英文版）

基　　金：the National Key Research and Development Project of China (No.2016YFC0402204);the National Natural Science Foundation of China (Grant No.41571107);the Key Research Program of the Chinese Academy of Sciences (No.KFZD-SW-318);the Key Project of Water Resources Department of Jiangxi Province (No.KT201503).

摘　　要：Water level fluctuations (WLF) are natural patterns that are necessary for the survival of various plants,and WLF guarantee both the productivity and the biodiversity of wetlands.However,the underlying mechanisms of how changes in vegetation are linked to seasonal WLF remain unclear.Using vegetation and hydrological data from 1989 to 2009,we identified the key seasonal fluctuations and their impacts on vegetation in the Poyang Lake wetland by utilizing a tree-based hierarchical model.According to our results: 1) WLF in summer had significant impacts on both sedges and reeds.The severe summer floods promoted the expansion of sedges,while they inhibited the expansion of reeds;2) WLF in autumn also greatly impacted sedges,while reeds were severely affected in spring.Specifically,we found that low water levels in autumn led to the expansion of sedges,and low water levels in spring led to the expansion of reeds.The results were well corroborated through comparisons of the vegetation distribution patterns over the last two decades (i.e.,the 1990s and 2000s),which may shed light on corresponding water resource and wetland management.

关 键 词：WETLAND reeds SEDGES SEASONAL WATER-LEVEL FLUCTUATIONS classification and regression tree model 

分 类 号：P[天文地球]