关键词: 涝渍地, 梯级分布, 梯级开发模式

Abstract: Based on the 2000-2009 MODIS data, this paper analyzed the spatiotemporal variation of Normalized Difference Vegetation Index (NDVI) in Anhui Province. In the recent ten years, the annual average NDVI in the province increased, but had some differences in its spatial distribution, i.e., tended to be decreased in parts and increased in most regions. The monthly variation of the index presented weak double-peak pattern, with the maximum in August and the minimum in January. Based on the linear slope of the index in each season, the fastest increase was in spring, followed by in autumn, and the slowest in winter. In Dabie Mountain and southern mountainous area of Anhui Province, the interannual standard deviation and coefficient of variation of the index were smaller, indicating that the index had no significant change in mountainous area due to be less affected by outside interferences. Oppositely, the interannual standard deviation and coefficient of variation of the index in the grain production areas along Huaihe River were larger, which meant that human activities contributed more to the changes of the index.

Key words: Waterlogged land, Step divergence, "Development in a step way" model