植被指数与退耕还林( 草) 初期的遥感监测应用

探讨了植被指数的几种主要形式( IDV 、NDVI、Tasseled Cap Greenness) 及其在退耕还林( 草) 初期( 2000～2002 年) 效能监测中的应用。运用遥感数据处理、GIS( ARC/ INFO) AML 编程统计出青藏-黄土高原结合部复杂地形条件下退耕还林( 草) 各类型地块的3 期平均植被指数, 及两年间相应的植被指数变化, 对比分析了各类型植被指数与其它属性数据间的关系, 发现7～9 月份积温和湿润度条件对植被指数的影响主要表现为累积效应。研究认为, 通过更详实的地表植被状态的适时调查, 建立并应用遥感成像前期地表水热因子与各类型的植被指数向量之间的映照关系, 上述方法将有更实际的意义。

Vegetation Indices and the Applications in Monitoring Tillage Reverting to Woodland or Grassland Ecosystems

By ARC/ INFO AML programming and RS methods,a vectorized Vegetation Indices(VI) database for Yuzhong Monitoring Area in the process of Tillage Reverting to Woodland or Grassland ecosystems was completed,it contains 3 spatial data sets representing the vegetation status of the July-August in 2000,2001 and 2002,as the results of 3 TM imageries.VI's including IDV,NDVI,Greenness of Tasseled Cap were selected to reflect the differences of land covers and changes in the 3 year period.Land covers were categorized into 3: Tillage Reverting lots,land use types and basic classes of forest in the National Nature Protection Region. Comparisons of VI's and analysis on the relations to land cover attributes were approache,,and apprehension of VI's on monitoring Tillage Reverting to Woodland or Grassland ecosystems was discussed.