基于SPOT-VGT数据的新疆1998-2007年植被覆盖变化监测

Monitoring of Vegetation Cover Dynamic in Xinjiang Based on SPOT-VGT Date from 1998 to 2007

利用1998—2007年1 km×1 km的SPOT—VGT数据,采用MVC法和差值法分析了新疆植被覆盖随时间的变化特征。通过一元线性回归法模拟了新疆维吾尔自治区年最大化NDVI的变化趋势。结果表明,过去10 a间,全疆年均最大化NDVI值略有下降;春季NDVI呈增加趋势,秋季减势显著;7月为年内植被最丰盛期,10 a间NDVI累积增长主要发生在3,4,6月份,9月份累积减量最大。模拟结果显示,全疆植被改善区域面积小于退化区域面积,植被覆盖整体上呈退化趋势;植被改善幅度较大的主要为绿洲农业区,退化趋势明显的主要为森林、草场分布的山区。

The dynamic of vegetation cover in Xinjiang Wei Autonomous Region was analyzed based on 1 km×1 km SPOT-VGT data from 1998 to 2007.The MVC method,difference value method were used to analyze the annual,seasonal and monthly NDVI changes.The univariate linear regression of one variable was used to simulate the changing trend of the NDVI values.The results show that from 1998 to 2007,the annual maximum NDVI value declineds slightly in Xinjiang.The NDVI values showed an increasing trend in spring while decrease ...