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Effects of straw size in buried straw layers on water movement in adjacent soil layers

International Journal of Agricultural and Biological Engineering 2016年第2期9卷 74-84页

作者： Yao Mingze Li Bo Wang Tieliang Feng Xue College of Water Conservation Shenyang Agricultural UniversityShenyang 110866China

deeply buried straw retention can improve the soil content of organic matter,its capacity for moisture preservation,the agroecological environment utilization efficiency of water resources,ensuring a stable crop yield;at the same time,the quantitative effects of deeply buried straw retention on soil moisture have a direct influence on the promotion and application of the *** an infiltration and evaporation experiment of a one-dimensional soil column,the effects of straw size on the water content of the straw and the adjacent soil were evaluated when the straw was deeply buried in soil;the infiltration and evaporation features of different sized straw and its adjacent soil were analyzed;the hydraulic conductivity,sorptivity and saturated water content of the straw were obtained;in the end,the water distribution laws of straw and adjacent soil under the same conditions were *** experiment was comprised of rod-shaped straw(RS),segment-shaped straw(SS)and filament-shaped straw(FS)to control treatment(CK).The results indicated that from the perspective of infiltration,the infiltration rate of filament-shape straw was the lowest at the stage of straw *** hydraulic conductivities of rod-shaped,filament-shaped and segment-shaped straws are 4.01 mm/min,1.33 mm/min and 0.03 mm/min at the stage of straw and adjacent soil saturation,*** is a strong effect on preventing infiltration from segment-shaped straw;with the help of the Philip model of long duration,the sorptivity of the soil with rod-shaped,filament-shaped and segment-shaped straws was 12.31 mm/min0.5,11.02 mm/min0.5 and 24.26 mm/min0.5 at the unsaturation stage,*** segment-shape straw improved the water absorption capacity of the soil and straw *** water retention capacities indicated that the saturated water contents of sandy loam,filament-shaped straw,segment-shaped straw and rod-shaped straw were 0.38 cm^(3)/cm^(3),0.29 cm^(3)/cm^(3),0.26 cm^(3)

关键词： deeply buried straw straw size soil moisture infiltration evaporation water retention

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