【摘要】：微波具有穿透性,相對于可見光與紅外探測器而言,微波探測器不僅能反映葉片層植被信息,還能反映較深層木質(zhì)生物信息。筆者利用6.6 GHz與18.7 GHz被動微波輻射計對夏季玉米進(jìn)行了不同角度(0°~60°每5°一個間隔)、不同極化(V與H極化)及不同方位(順壟、垂直壟、壟向45°)的微波輻射特性觀測試驗。試驗中玉米從幼苗到抽穗共分8期進(jìn)行了測量,每期都利用LAI-3000實地獲得了LAI數(shù)據(jù),以此代表植被的生長狀態(tài)。研究結(jié)果表明,隨著觀測角度和LAI的增大,V和H極化的亮溫都有明顯變化;微波植被指數(shù)隨觀測角度和LAI的變化都有明顯規(guī)律;測量方位對玉米的微波輻射特性有明顯的影響;土壤對植被的微波輻射影響隨植被的長高而減弱。
[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 擄~ 60 擄every 5 擄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 擄. 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.
【作者單位】： 東北大學(xué)測繪遙感與數(shù)字礦山研究所;遼寧省交通高等�？茖W(xué)校;
【基金】：國家自然科學(xué)基金重點項目(40730525)
【分類號】：S513;S127

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