利用垂直植被指数推算作物叶面积系数的理论模式

The Derivation of A Reflectance Model for The Estimation of Leaf Area Index Using Perpendicular Vegetation Index

从作物冠层对光谱的反射特征出发，推导了叶面积系数ＬＡＩ的遥感估算模式，并利用水稻样点观测数据对模式进行了验证，取得了良好效果。

Information about crop reflectance was derived based on the theory that the radiationdecreased with the exponential function from the top of crop canopies to the bottom.Thecrop reflectance was strongly affected by leaf area index (LAI) and extinction coefficient ofcrop canopies,Since the main problem of estimating LAI was the interference of soil,acorrection for soil background had to be made using perpendicular vegetation index(PVI). Subsequently,the model of estimating LAI using PVI was put forward. Simulation of riceLAI with PVI confirmed the potential of this reflectance model for estimating LAI.