Time series analysis of vegetation cover in north piedmont of Yinshan Mountain

摘要

North piedmont of Yinshan Mountain is a typical fragile ecology zone and important eco-shelter in north China, therefore, to monitor and analyze its dynamics of vegetation cover is an important entrance to study response of global change in this area even the ecotone. Based on annual SPOT4/VEGETATION images of this area from 1998 to 2003, we did time series analysis on dynamics of annual maximum NDVI, which reflected dynamics of vegetation cover condition, and then drew three conclusions: Firstly, the whole area annual maximum NDVI was degenerated continuously from year 1999 to 2001, while was improved continuously in the next two years. Secondly, when it comes to woodland, grassland and cropland, the order of the annual maximum NDVI and their change in a year both were: cropland