基于三维真实场景的落叶松林参数敏感性分析

Coniferous Forest Parameter Sensitivity Analysis Based on 3-D Real Scene

森林冠层结构对太阳辐射能量有重要的影响,而双向反射率因子(BRF)在植被冠层反射研究中对冠层的生物物理特性起重要作用。本文在针叶树简化实验和落叶松模拟的基础上,分析了BRF对落叶松及其环境参数的敏感性:叶面积指数(LAI)、太阳位置、地面背景和天空光比例。研究结果表明冠层的空间结构分布、地面背景的类型对BRF有很大的影响。

Forest canopy structure has an important effect on the solar radiation energy,and Bidirectional Reflectance Factor（BRF） plays an important role to the canopy biophysical properties in studying vegetation canopy reflectance.This article is based on simply experiment of larch tree and simulated larch forest,and compared BRF sensitivity to several biophysical parameters： Leaf Area Index（LAI）,soil background and the sun angle.The results showed that the canopy space structure,the type of soil background have a great impact on the BRF.The change LAI makes the change in reflectance;the change of the sun angle leads to the change of hotspot,as well as the reflectance.