Abstract: 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, ā_Q and ā_U,of TSR and PAR and the green leaf area index (L)are discussed respectively.

Key words: Erectophile maize, Extinction coefficient, Radiation interception, soil microbial biomass, alpine-gorge region., soil enzyme activity, altitude