摘要
以草地NPP减少的相对百分数(由实际NPP和潜在NPP计算)为主要监测指标,提出了一个基于单时相MODIS数据的草地退化遥感监测方法。介绍了利用MODIS数据反演实际NPP的方法,并提出了一个根据实际NPP和草地类型分布图确定潜在NPP的方法。对2003年中国北方草地的监测结果表明,中国北方草地退化严重,退化程度的空间差异性较大,草地退化程度与草地类型密切相关。
A method of monitoring grassland degradation based on mono temporal MODIS data was proposed. The method took the relative percentage of reduced net primary productivity （NPP）, which could be calculated by actual NPP and potential NPP, as the main monitoring indicator. Then how to retrieve actual NPP from MODIS data was introduced briefly. And a method of determination of potential NPP by actual NPP and grassland type distribution map was also proposed. Finally the monitoring method was applied to analyze the spatial characteristics of grassland degradation in north China in 2003. The results showed that： 1） the grassland degradation in north China is very serious 2） spatial variation of the degradation is very ohvious; 3） the degradation degree is closely related to grassland types.
出处
《中国草地学报》
CSCD
2007年第1期39-43,共5页
Chinese Journal of Grassland
基金
国家自然科学基金项目(30571078)
科技部公益项目(2005DIA3J032)
国家科技基础条件平台建设项目(2003DIA7J047)
关键词
草地退化
遥感监测
单时相
MODIS
NPP
Grassland degradation
Remote sensing monitoring
Mono temporal
MODIS
NPP
