Mechanism Of Increasing Yield Of Intercropping And Mixed Cropping Patterns Of Alfalfa And Gramineous Crops

It has studied systemically spatio-temporal diversification of illumination intensity, soil temperature, water content and N content of soil in intercropping and mixed cropping Alfalfa with different grammineous species, and its effect to multiplex community of intercropping and mixed cropping's configuration, yield and nutrient quality. The results showed that, at growth stage, compared with monocropping, intercropping silage maize's illumination intensity of bottom increased 45.8%, its middle part increased 52.1%, and transmittance increased 5.3%, 6.4% respectively; At booting stage, compared with monocropping, intercropping silage durra's illumination intensity of bottom increased 13.3%, its middle part increased 15.0%, and transmittance increased 1.3%,1.9% respectively. There was no difference between monocropping grazing and intercropping grazing in the illumination intensity and transmittance, for there was no difference in interspace structure. During bearing period, teperature of 5-30 cm soil layer of silage maize and durra was all higher than monocropping in the mixed cropping community, and it near the optimum teperature to root growth. the siol temperature of intercropping Alfalfa community was lower to monocropping and the optimum teperature to root growth for shade of silage maize. since the density and plant height of intercropping's community was in accord with monocropping's community, so there was no effecet to soil teperature. During 0-70 cm, intercropping< monocropping