Vegetation changes in the Poyang Lake wetland related to the construction of the Three Gorges Dam (TGD) and climate change have received increasing attention in recent decades. However, due to the high spatial heterogeneity, the changes in wetland vegetation have not been well quantified at a large spatial scale. We addressed this challenge by using Moderate Resolution Imaging Spectroradiometer (MODIS) data from 2000 to 2012. Using a Mann-Kendall (MK) test, statistically significant decreasing trends were found in the Enhanced Vegetation Index (EVI) at the upper edge of the Poyang Lake wetland. In contrast, the vegetation distributed at lower elevations experienced a significant increasing trend during the study period. Downward boundaries of wetland vegetation in response to declining water levels could partially explain the increases in vegetation coverage. Vegetation colonized the non-vegetation area more quickly after the implementation of the TGD due to the earlier recession of the lake level during the recession period. Our findings suggested that hydrological changes caused by the lake decline might be the main factors driving the vegetation area changes. The information provided in this study is critical for future conservation and restoration efforts in the Poyang Lake wetland ecosystem.

近几十年来，to阳湖湿地的植被变化与三峡大坝（TGD）的建设以及气候变化有关。然而，由于高度的空间异质性，湿地植被的变化尚未在较大的空间尺度上得到很好的量化。我们通过使用2000年至2012年的中等分辨率成像光谱仪（MODIS）数据解决了这一挑战。使用Mann-Kendall（MK）测试，在yang阳上缘的增强植被指数（EVI）中发现了统计上显着的下降趋势。湖湿地。相反，在研究期间，分布在较低海拔的植被经历了明显的增加趋势。响应于水位下降，湿地植被的下界可以部分解释植被覆盖率的增加。TGD实施后，由于在衰退期间较早的湖面衰退，植被在非植被区的入侵速度更快。我们的发现表明，由湖泊下降引起的水文变化可能是驱动植被面积变化的主要因素。这项研究提供的信息对于future阳湖湿地生态系统的未来保护和恢复工作至关重要。我们的发现表明，由湖泊下降引起的水文变化可能是驱动植被面积变化的主要因素。这项研究提供的信息对于future阳湖湿地生态系统的未来保护和恢复工作至关重要。我们的发现表明，由湖泊下降引起的水文变化可能是驱动植被面积变化的主要因素。这项研究提供的信息对于future阳湖湿地生态系统的未来保护和恢复工作至关重要。