基于NDVI的西藏自治区草地退化评价模型

A Model of Grassland Degradation Assessment Based on NDVI---Taking the Grassland in Tibet as an Example

本文选择草地退化三个主要的表征因子草地盖度、牧草生物量和牧草植株高度来反映草地“量”的退化程度,并运用因子分析的方法算出各个表征因子的权重,加权求和得出草地综合评价指数。最后根据NDVI与草地综合评价指数建立草地退化评价模型,为草地退化的遥感宏观评价提供了一种新方法。

Three factors including grassland coverage, biomass and height are selected to reflect grassland degradation in quantity and their weights are calculated through factor analysis, then grassland degradation index can be calculated by summing up the value of the factors with different weight. Finally, a model of grassland degradation assessment is built based on NDVI and grassland degradation index, which provides a new method for grassland degradation assessment with remote sensing.