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马尾松LAI与植被指数的相关性研究

DOI: 10.6046/gtzyyg.2010.03.09, PP. 41-46

Keywords: 植被指数(VI),叶面积指数(LAI),马尾松,相关性分析,IRS-P6(LISS-III)影像

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Abstract:

?以福建省永安市区为研究区,计算IRS-P6(LISS-III)多光谱数据的DVI、EVI2、MSAVI、NDVI、RDVI、RVI及TNDVI等7种植被指数,并与使用LAI-2000测量的马尾松叶面积指数(LAI)建立相关关系,分析植被指数对马尾松LAI的影响。从决定系数(R2)和标准误差两个方面对基于不同植被指数的LAI反演模型进行定量分析,反演模型包括线性模型、二次曲线模型、幂函数曲线模型和指数曲线模型4种。结果表明,马尾松LAI与植被指数呈指数曲线相关或幂函数曲线相关。反演马尾松LAI,最佳的统计模型是指数曲线模型和幂函数曲线模型,较佳植被指数为TNDVI、NDVI和RVI,其指数曲线模型和幂函数曲线模型拟合的R2均高于0.76,且验证结果R2均高于0.84,但RVI指数反演的模型标准误差相对较大。总体而言,TNDVI和NDVI的指数曲线和幂函数曲线模型对马尾松LAI具有较好的预测性。

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