Impacts of Maize Straw Additive on Soil Water Evaporation with Sandy Loam in the Region of Jingtai, Gansu Province*

摘要

Through laboratory experiments, the effects of adding different maize straw addictive and proportions in soil on the moisture evaporation characteristics were studied under the condition of different burial depth. Results showed that the relationship between soil moisture diffusivity and soil water content can nice described by an exponential function. Under the same soil water suction, soil water content of treatments with maize straw additive are all higher than pure soil. Between the treatments of soil with 3% maize cob and maize leaf, maize leaf treatment has a better water retention effect, but the difference is little in the treatments with 1% maize straw additive; maize leaf is superior to maize cob in the capacity of inhibiting soil water evaporation, and the treatment with 3% maize leaf in the depth of 0-5 centimeter soil layer can reduce soil moisture evaporation effectively.