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实验观测分析了玉米群体总辐射的透过率、截获率、反射率和消光系数,结果表明玉米群体总辐射透过率、反射率和消光系数具有明显日变化特征;玉米雄穗开花前后其群体透过率和截获率有明显变化;日际反射率随玉米生育期而异,初期达0.23,之后逐渐下降至0.14左右;生育期平均反射率约为0.19;总辐射和净辐射的消光系数分别为0.51和0.41。提出了总体消光系数的概念,该系数在观测期较稳定,约为0.26,依此利用入射总辐射可算出作物群体冠层辐射截获量。
The results showed that the total radiation transmittance, reflectance and extinction coefficient of maize population had obvious diurnal variation characteristics. The population of maize before and after flowering The transmissivity and the interception rate have obvious changes. The daily reflectivity varies with the growth period of maize, reaching 0.23 in the initial stage and then gradually decreasing to 0.14. The average reflectivity at the growth stage is about 0.19. The extinction coefficient of the total radiation and the net radiation respectively 0.51 and 0.41. The concept of total extinction coefficient was proposed. The coefficient was stable during the observation period, which was about 0.26. Based on the total incident radiation, the interception of canopy radiation was calculated.