Publications

Kuang, RY; Zhuang, XY; Xie, SY (2025). Spatio-temporal changes of vegetation NDVI in Poyang Lake based on MODIS time series data. LIMNOLOGY.

Abstract
As an important part of the lake ecosystem, the vegetation of Poyang Lake is of great significance to the sustainable development of the lake's ecological environment. Based on MODIS image from 2001 to 2020, we studied the spatial-temporal variation characteristics of NDVI (normalized difference vegetation index) in Poyang Lake. Using M-K (Mann-Kendall) test and slope trend analysis method, we studied its abrupt change and overall trend. Poyang Lake water area data and DEM data were used to analyze the change in NDVI with water area and investigate the relationship between NDVI and elevation. The results showed that the changing trend of NDVI value in 20 years was relatively stable, mostly not significant, and the number of pixels accounted for 88.55% of the whole lake area. The proportion of NDVI increasing trend was greater than that of decreasing trend, which was 9.18% and 2.27%, respectively. Affected by the water level, the seasonal variation of NDVI in the Poyang Lake area was significant. The water area was negatively correlated with NDVI value. But the elevation was positively correlated with NDVI value. The results revealed the spatial distribution and the variation characteristics of NDVI in Poyang Lake, which was of great significance for vegetation protection and ecological environment evaluation of Poyang Lake.

DOI:
10.1007/s10201-025-00798-5

ISSN:
1439-863X