草地净第一性生产力(NPP)是全球变化与陆地生态系统研究的核心内容之一。
The grassland net primary production (NPP) is an important research issue in the global climate change and terrestrial ecosystem.
根据北方农牧交错带（定西县1970～2000年）的气候资料，分析了该地区30年来气候变化周期、趋势及其草地气候生产力的变化。
According to climate data(1970~2000) in the northern farming and pastoral area, the climate change cycle, trend and grassland climate productivity about 30 years were analyzed.
根据北方农牧交错带（定西县1970～2000年）的气候资料，分析了该地区30年来气候变化周期、趋势及其草地气候生产力的变化。
According to climate data(1970~2000) in the northern farming and pastoral area, the climate change cycle, trend and grassland climate productivity about 30 years were analyzed.
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