摘要
合成孔径侧视雷达穿透冠层而获得树干信息的特点使得其具有在南方NDVI易饱和地区的生物量估测方面优于光学遥感。文章利用地面实测调查数据,首次系统地研究了热带人工林生物物理参数及生物量对RADARSAT-SAR信号响应。结果表明:RADARSAT-SAR后向散射系数与森林生物量、树高、胸径可以用对数模型模拟。对于本实验区人工速生林来说,在森林生物量小于40 t.hm-2时RADARSAT-SAR后向散射系数与森林生物量具有较强相关性。桉树树高与后向散射系数的相关系数大于桉树胸径与后向散射系数关系。松树胸径与后向散射系数相关系数高于树高与后向散射系数的相关系数。研究结果为SAR在热带森林研究中的应用提供了一定的理论基础。
Aboveground biomass and it＇s distribution can help us to understand global carbon cycle and the global change. Studies are needed to evaluate the ability of present SAR date on investigating forest ecology. Based on the field survey date, the sensitivity of biomass and forest parameters on RADARSAT-SAR date was analyzed in this paper. Results show that RADARSAT-SAR Backscatter coefficient has a good logarithm correlation with forest aboveground biomass when aboveground biomass smaller than 40thm^-2. Baekscatter coefficient is affected by tree height much more than by diameter at breast height for Eucalypt, but for pine trees, Backscatter coefficient is affected by diameter at breast height much more than by tree height. The result indicate that C band of SAR can be used to estimate biomass of such plantation.
出处
《生态环境》
CSCD
北大核心
2006年第1期115-119,共5页
Ecology and Environmnet
基金
中国科学院知识创新工程重大项目(KZCX1-SW-01-02)
国家重点基础研究发展规划项目(G2000077902)
