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叶面积指数(LAI)是描述植被冠层几何结构的最基本的参数,是气候模型、地-气相互作用等过程的重要输入参数.近年来遥感反演LAI的尺度效应问题得到广泛关注.在作物冠层反射率模型基础上,讨论了LAI尺度效应的产生机制,并获得不同尺度之间LAI的转换公式,数值模拟试验和实际遥感图像试验都证明了该尺度转换公式的可靠性.
Leaf area index (LAI) is the most basic parameter to describe the vegetation canopy geometry and is an important input parameter of climate model, ground-atmosphere interaction, etc. In recent years, the LAI scale effect has received extensive attention. Based on the crop canopy reflectance model, the generation mechanism of LAI scale effect is discussed. The LAI conversion equation, numerical simulation experiment and actual remote sensing image experiment at different scales are also proved the reliability of the scale conversion formula.