植被单叶光谱特性的理论模拟  

Theoretical Simulation of Single Leaf's Optical Characteristics

作　　者：颜春燕[1] 蒋耿明[1] 王成[1] 牛铮[1] 王长耀[1] 

机构地区：[1]中国科学院遥感应用研究所

出　　处：《遥感学报》2003年第2期81-85,共5页NATIONAL REMOTE SENSING BULLETIN

基　　金：国家重点基础研究发展规划项目 (G2 0 0 0 0 7790 0 )

摘　　要：利用PROSPECT模型和实测的玉米叶片光谱数据 ,得出了叶肉结构参数N ,从而模拟了在不同的叶绿素和水分含量下玉米叶片的光学特性 ;发现叶绿素对叶片吸收率的影响在可见光部分占了主导作用 ,随着叶绿素含量的增加 ,叶片的吸收率增加 ;从近红外到 2 4 0 0nm ,水分对吸收率的影响占据了主导地位 ,此时 ,随着水分含量的增加 ,叶片的吸收率也开始增加。同时 ,给定叶绿素和水分含量 ,还模拟了当叶肉结构参数变化时的叶片的光学特性 ,随着N的增大 ,叶片的反射率逐渐增大 ,并渐趋一致 ,而透过率随着N的增加而逐渐减小 ,最后也逐渐靠近。In this study using PROSPECT Model and in situ optical measurement of corn leaf, mesophyll structure parameter N of different growth phase as calculated. Based on this, given different chlorophyll and water content, corn leaf optical characteristics were modeled. It is found that in the visible region, chlorophyll dominates the optical characteristics, with the increasing of leaf chlorophyll content leaf reflectance and transmittance decrease and accordingly leaf absorptance increases while in the infrared region, water's effect prevails, with the increasing of water content leaf reflectance and transmittance decrease and accordingly leaf absorptance increases. At the same time, given fixed chlorophyll and water content, leaf optical characteristics varying with different mesophyll structure were simulated. It is found that with the increasing of N , leaf reflectance increases and reaches an asymptote while leaf transmittance decreases and reaches an asymptote also.

关 键 词：植被单叶 光谱特性 模拟 PROSPECT模型 

分 类 号：Q945[生物学—植物学]