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印度植被净初级生产力的时空变异及其影响因素分析

DOI: 10.3724/SP.J.1047.2015.01355, PP. 1355-1361

Keywords: 植被净初级生产力,印度,遥感,分段线性回归,转折点

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Abstract:

本研究旨在探讨1983-2008年间印度植被净初级生产力(NPP)的时空变化格局及其与温度降水的关系。基于遥感数据和GLOPEM-CEVSA模型估算区域植被NPP,利用分段线性回归,分析了过去26年印度植被NPP的时空格局与变化特征。结果表明(1)过去26年间印度植被年均NPP为414.29gC·m-2·a-1,森林、农田和草地的NPP平均值分别为1002.32、485.98和631.39gC·m-2·a-1。(2)分段线性回归结果显示,1983-2008年间,印度植被总平均NPP呈先上升后下降的趋势,趋势转折点在1996年。占印度面积比例最大的农田植被类型的平均NPP也呈先上升后下降的趋势,趋势转折点在1996年,与总平均NPP的趋势转折点一致。(3)在空间上,印度大部分地区,发生了趋势转折,趋势转折点集中在1991-2000年间,大部分地区NPP在趋势转折点前呈上升趋势,其后呈下降趋势,与区域平均NPP的变化趋势一致。(4)印度西北部干旱地区植被NPP与温度呈负相关,与降水呈正相关。喜马拉雅山南部森林NPP则与温度呈正相关。降雨量较大的印度南部地区NPP与降水呈负相关。

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