测量方位与土壤对玉米微波辐射特性的影响分析

发布时间：2019-01-03 13:21

【摘要】：微波具有穿透性,相对于可见光与红外探测器而言,微波探测器不仅能反映叶片层植被信息,还能反映较深层木质生物信息。笔者利用6.6 GHz与18.7 GHz被动微波辐射计对夏季玉米进行了不同角度(0°~60°每5°一个间隔)、不同极化(V与H极化)及不同方位(顺垄、垂直垄、垄向45°)的微波辐射特性观测试验。试验中玉米从幼苗到抽穗共分8期进行了测量,每期都利用LAI-3000实地获得了LAI数据,以此代表植被的生长状态。研究结果表明,随着观测角度和LAI的增大,V和H极化的亮温都有明显变化;微波植被指数随观测角度和LAI的变化都有明显规律;测量方位对玉米的微波辐射特性有明显的影响;土壤对植被的微波辐射影响随植被的长高而减弱。
[Abstract]:Compared with the visible and infrared detectors, microwave detectors can not only reflect the foliage vegetation information, but also reflect the deeper wood biological information. By using 6.6 GHz and 18.7 GHz passive microwave radiometer, different angles (0 掳~ 60 掳every 5 掳interval), different polarization (V and H polarization) and different azimuth (row, vertical ridge) in summer maize were studied. Observation test of microwave radiation characteristics of ridge direction 45 掳. In the experiment, maize was divided into 8 stages from seedling to heading. LAI data were obtained from LAI-3000 in each stage, which represented the growth state of vegetation. The results show that the brightness temperature of V and H polarization changes obviously with the increase of observation angle and LAI, and the change of microwave vegetation index with observation angle and LAI is obvious. The measured azimuth has obvious influence on the characteristics of microwave radiation of maize, and the effect of soil microwave radiation on vegetation weakens with the height of vegetation.
【作者单位】：东北大学测绘遥感与数字矿山研究所;辽宁省交通高等专科学校;
【基金】：国家自然科学基金重点项目(40730525)
【分类号】：S513;S127

【相似文献】