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基于CASA模型的北京植被NPP时空格局及其因子解释

DOI: 10.6046/gtzyyg.2015.01.21, PP. 133-139

Keywords: 净初级生产力(NPP),CASA模型,遥感,北京

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Abstract:

以北京为研究区,整合遥感数据、气象数据及其他多源辅助数据,基于改进的光能利用率(carnegie-ames-stanfordapproach,CASA)模型分析了2010年北京植被生态系统净初级生产力(netprimaryproductivity,NPP)的时空分布格局及其主要影响因素。结果表明:12010年北京NPP总量为5.5TgC,其NPP的空间分布格局为北部和西部山区总量较高,平原区NPP总量较低;2北京植被NPP的季节变化明显,夏季NPP最大,占全年的62%,冬季最小,仅占3%,春季和秋季分别占全年NPP总量的18%和17%;3北京植被NPP受水分和热量条件限制,不同区域的主要限制因子不同,北部和西部山区自然植被受气温影响较大,平原区农作物生长更容易受降水影响,而在山区向平原过渡区域的植被受太阳辐射变化影响明显。

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