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中文摘要：
草地植被净第一性生产力表征了草地生态系统的物质量，是评价草地生态系统物质生产能力的重要指标。本文基于ERDAS和ArcMap软件平台，由1990、2000和2007年ETM＋影像数据提取出NDVI值，结合相应时段的气候数据，对陕北农牧交错带草地生态系统净第一性生产力及固碳释氧量进行测算，研究并分析了1990—2007年间其NPP及固碳释氧量的时空变化特征。
英文摘要：
Grass NPP characters the physical quantity of grass ecosystem. It is the most important indicator when evaluating the material production capacity of grass ecological system. Based on ERDAS and ArcMap software platforms, the study estimated NPP and fitting CO2 and releasing O2 based on NDVI which were extracted from remote sensing data （ETM ＋ ） in 1990s, 2000s, 2007s and the relevant climate data in the farming-pastoral ecotone in North Shaanxi Province. Temporal and spatial dynamics change of NPP and fitting CO2 and releasing O2 were studied and analyzedfrom 1990a to 2007a as well.
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Variations in Ecosystem Service Value in Response to Land use Changes in the Loess Plateau in Northe
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