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《Journal of Hunan University(Natural Sciences)》 2014-01
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Water Level Responses of East Dongting Lake Wetland's NDVI from 2001 to 2010

ZENG Guang-ming;LAI Xu;LIANG Jie;HUANG Lu;LI Xiao-dong;LONG Yong;WU Hai-peng;YUAN Yu-jie;College of Environmental Science and Engineering,Hunan Univ;Key Laboratory of Environmental Biology and Pollution Control(Hunan Univ),Ministry of Education;  
The purpose of this paper was to study the vegetation cover and water level change functions of East Dongting Lake wetland.The vegetation cover corresponding to water level change was also investigated.After the preliminary treatment of TIMESAT,the normalized difference vegetation index(NDVI) time-series was adopted to analyze the relationship between vegetation cover and water-level in the divided zones(A,B,and C).Then,NDVI sample autocorrelation curve was used to show the differences of the three areas under study.Lastly,the spearman correlation coefficient(ρs)of NDVI time-series corresponding to water-level was used to discuss the effects of the Three Gorges Dam.The results indicated that,(1) all the NDVI time-series under the impacts of water level formed an annual cyclical change style.Every cycle had two crests,one in April and the other in October.In the flood period,the curve formed a trough in July.Quadratic polynomial fitting showed that the critical water level of maximum vegetation cover was about 24-25m.(2)The degree of the effects of water level on vegetation cover was Zone AZone BZone C.This phenomenon was mainly caused by the differences of elevation and vegetation types.(3)After the analysis of the Spearman rank correlation of 2003,2006and 2009,big changes took place in aquatic-terrestrial zone.In these three years,the storage water level of the Three Gorges went up from 135mto 175m, and theρs of the areas studied increased to 0.641,0.687and 0.518,respectively.The water storage of the Three Gorges Dam affected the relationship between the vegetation cover and the water level in East Dongting Lake.
【Fund】: 国家自然科学基金资助项目(51039001 51009063);; 国务院三峡委员会项目(SX2010-026);; 湖南大学青年老师成长计划项目;; 广州白云湖水质改善项目(BYHGLC-2010-02)
【CateGory Index】: X171
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