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棉花学报  2011 

基于光谱参数的棉花叶面积指数监测和敏感性分析

DOI: 1002-7807(2011)06-0552-07, PP. 552-558

Keywords: 光谱参数,叶面积指数,估测模型,敏感性

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Abstract:

研究棉花冠层光谱参数对不同叶面积指数的响应,建立棉花叶面积指数光谱参数最佳估测模型,并对所选光谱参数进行敏感性分析。利用高光谱仪测定不同时期不同叶面积指数条件下的棉花冠层光谱反射率。结果表明,694nm和1099nm分别为可见光和近红外波段区域内与叶面积指数相关性最好的波段,并用于改进前人所建立的光谱参数;宽范围动态植被指数和比值植被指数与叶面积指数的拟合效果最好,估测模型的决定系数(r2)分别为0.8375和0.8324;此外,比值植被指数对棉花叶面积指数变化的敏感性大于宽范围动态植被指数。

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