MODELING DEFOLIATION CONDITIONS IN MODERATE CANOPY DENSITY AND CLOSED CONIFEROUS FOREST USING LANDSAT TM DATA
Wu Honggan1, Cui Hengjian2, Qiao Yanyou1, Huang Jianwen1, Chen Linhong3
1. The Research institute of Forest Resource Information Techniques, CAF Beijing 100091;
2. Department of Mathematics, Beijing Normal University, Beijing 100875;
3. Forest Protection Station of jiangshan City, Zhejiang Province 324100
It is an important subject to monitor and assess forest resource quality.This not only relates to forest industry, but also affects regional environment and continuable development.This paper quantatively probes into the feasibility of mapping and assessing forest defoliation by remote sensing data, and indicates there is some correlative relation between the TM5/TM4 ratio and needle loss percentage. The nonlinear relation between the defoliation and TM5/TM4 ratio is established by using nonparametric smoothing weight method and it is compared with linear relation. Powerful numericai results are provided to search for the best remote sensing parameter discriminating needle loss percentage. It is concluded that Logist curve is suitable for describing forest strecture change caused by defoliation.
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1995, Vol. 7 
