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

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.

发文机构：Key Laboratory of Watershed Geographic Sciences University of Chinese Academy of Sciences Jiangsu Second Normal University

关键词：WETLANDreedsSEDGESSEASONALWATER-LEVELFLUCTUATIONSclassificationandregressiontreemodel

分类号： P[天文地球]