紧凑型夏玉米群体的辐射截获

测量了紧凑型夏玉米 (掖单 1 3)群体的太阳总辐射和光合有效辐射 ( PAR)的反射率、透过率和截获率 .结果表明 ,紧凑型夏玉米具有直立型叶片的透光和截获特点 ,抽雄前总辐射和 PAR的消光系数分别为 0 .2 84和 0 .40 1 ,良好的透光特性使紧凑型夏玉米比平展型的能承受更大的种植密度 .雄穗的透过率约为 75% ,去掉部分雄穗能改善叶簇的光照条件 .本文探讨了总辐射和 PAR的日平均截获率 (āQ)和 (āu)和绿色叶面积指数 ( L )的关系

Radiation interception by erectophile maize colony.

Measurement on the reflectance, transmissivity and interception of total solar radiation(TSR) and photosynthetic active radiation (PAR) of erectophile maize colony (variety Yedan 13) show that the maize has the characteristics of transmission and interception in erectophile leaves. The extinction coefficient of TSR and PAR before tasseling are 0.284 and 0.401 respectively. The nature of higher transmission of erectophile maize colony implies that the planting density of this type can be higher than that of planophile type. The transmissivity of tassel of the colony is about 75%. The illumination condition of the foliage can be improved in a certain degree by cutting some tassel of plants. The relationships between mean daily interception, Q and U,of TSR and PAR and the green leaf area index (L)are discussed respectively.