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中文摘要：
利用TIMESAT拟合2001年至2010年东洞庭湖的 MODIS-NDVI 数据,获得整个东洞庭湖湿地A及湿地西侧B和南侧C三个区域的NDVI时间序列.通过分析ND-VI时间序列与水位变化关系、绘制样本自相关曲线及计算Spearman秩相关系数（ρs ）,研究了东洞庭湖湿地植被覆盖和水位变化两方面功能状态,并探讨东洞庭湖湿地植被覆盖对水位变化的响应.研究表明：1）东洞庭的植被覆盖状况受水位作用是以年为周期,每周期内的4月及10月底出现一个峰值,丰水期7月份出现一个降低过程；二次多项式拟合显示植被覆盖峰值的水位临界点在24~25m 左右.2）三个研究区植被受湖泊水位作用大小关系是：A区＆lt;B区＆lt;C区,其主要影响因素是植被类型与区域高程的差异.3）在2003,2006及2009年这三个三峡的重要蓄水年,位于水陆交错带的 NDVI 值与水位的秩相关系数变化较大；三峡蓄水水位从135 m上升至175 m的这三年,三区域全年的ρs分别增长至0.641,0.687,0.518,相关性增强.三峡蓄水对东洞庭湖植被覆盖与湖泊水位关系产生一定影响.
英文摘要：
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 investi-gated.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 correspond-ing 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 cy-cle 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 a-bout 24-25m.（2）The degree of the effects of water level on vegetation cover was Zone A＆lt;Zone B＆lt;Zone C.This phenomenon was mainly caused by the differences of elevation and vegetation types.（3）After the analysis of the Spearman rank correlation of 2003,2006 and 2009,big changes took place in aquatic-terres-trial zone.In these three years,the storage water level of the Three Gorges went up from 135m to 175m, and theρs of the areas studied increased to 0.641,0.687 and 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.
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