CAJ | 학술논문

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。
실험관측분석료옥미군체총복사적투과솔、절획솔、반사솔화소광계수，결과표명옥미군체 총복사투과솔、반사솔화소광계수구유명현일변화특정；옥미웅수개화전후기군체투과솔화 절획솔유명현변화；일제반사솔수옥미생육기이이，초기체0.23，지후축점하강지0.14좌우 ；생육기평균반사솔약위0.19；총복사화정복사적소광계수분별위0.51화0.41。제출료총체 소광계수적개념，해계수재관측기교은정，약위0.26，의차이용입사총복사가산출작물군체 관층복사절획량。
The penetration,interception,reflectance and extinction coefficient of radiation of summer maize canopy are analyzed.The penetration,reflectance and extinction coefficient all show an obvious diurnal variation under clear sky;there are rema rkable changes for interception and penetration before and after flowering.The d aily reflectance decreases along with crop growing period,which is as high as 0. 23 at the initial stage and equal to 0.14 at the last growing stage.Over the who le growing period,the average is about 0.19.The canopy extinction coefficients f or incident short and net radiation are 0.51 and 0.41,respectively.A concept of bulk extinction coefficient is firstly introduced,which may be easily used to ca lculate the absorbed radiation by canopy.The variation of bulk extinction coeffi cient is more stable than that of the traditional extinction coefficient,on aver age,the bulk extinction coefficient is about 0.26.