Competition for light and crop productivity in an agro-forestry system in the Hilly Region, Shangluo, China Effect of extreme heat on winter wheat canopy carbon assimilation A study on the variations of pivotal photosynthetic active radiation parameters of a Leymus chinensis meadow-steppe in Hulunber Studies on Relationships between Cotton Population Composition and Transfer Characteristic of PAR Diurnal Variation of Eco-physiological and Photosynthetic Characteristics of Reynoutria japonica Main interspecific competition and land productivity of fruit-crop intercropping in Loess Region of West Shanxi. Effects of light competition on crop productivity in an intercropping agroforestry ecosystem A comparison of photosynthethetic characteristics in four poplar clones Effect of row space on population structure and photosynthetic available radiation in winter wheat-white clover intercropping system Light interception and utilization of maize-capsicum strip relay intercrop A biomass accumulation model for maize/soybean intercropping system