中国植被净初级生产力变化的时空格局

Spatiotemporal variation pattern of vegetation's net primary productivity in China

利用植被净初级生产力(NPP)遥感估算模型,基于统计学分析方法,研究了1982—2000年我国陆地植被NPP的变化及其年际波动的空间分布特征。结果表明:(1)20年间,我国仅8%的陆地区域植被NPP显著减少,而47%的陆地区域植被NPP显著增加,45%的陆地区域植被NPP变化不明显;(2)从空间分布上看,我国大部地区年NPP增加,仅东部沿海发达地区或工业、城市密集区的年NPP减少,但增减速率在空间上存在明显的差异;(3)1982—2000年间,我国大部地区植被NPP年际波动相对变率较小,但西北地区的荒漠草原,相对变率较大。

Based on the remote sensing and climatic data from 1982 to 2000 and by using statistical analysis, the spatiotemporal variation pattern of vegetation＇ s net primary productivity （NPP） in China was studied. In the 20 years, only 8% of the land had a marked decrease of the NPP, 47% of the land was in adverse, while approximately 44% of it had little change. The annual vegetation＇ s NPP increased in most parts of the country but decreased in its eastern developed provinces or industrialized and urbanized regions, and, there existed obvious spatial differences in the variation rate of the annual vegetation＇ s NPP. The inter-annual relative variability of vegetation＇ s NPP was smaller in most parts of China, but greater in the desert grassland area of northwestern China.