Experimental investigation into effects of maize leaf and straw fragments on soil water infiltration characteristics in furrow irrigation
ZHENG Jian1,3, WANG Yan1,3, CAI Huanjie2, ZHANG Enji1,3, SUN Yuxin1,3
1.China Western Energy & Environment Research Center, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Key Laboratory of Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, China; 3. China Northwestern Collaborative Innovation Center of Low-carbon Urbanization Technologies, Lanzhou, Gansu 730050, China
Abstract:To clarify effects of straw fragments on soil water infiltration characteristics and water content distribution in the soil in furrow irrigation, a series of experiments are carried out in laboratory by using maize leaf and straw fragments with different sizes, proportions and depths buried. In addition, the wetting front movement of soil water in different treatments is simulated with the software of HYDRUS-2D. The results show that soil water infiltration rate is decreased in the cases with maize leaf fragments, but increased in the cases with maize straw fragments significantly. For the cases with maize straw fragments, the soil vertical infiltration distance is increased if the fragments are buried in a depth of 10-15 cm, and the vertical distance of 18% soil water content contours is greater than that if the fragments are buried in 5-10 cm depth. In the cases with maize leaf fragments, the horizontal distance of 18% soil water content contours is increased when the fragments are buried in 10-15 cm depth compared with 5-10 cm depth. In the case that the soil is blended with 3% maize leaves in 10-15 cm depth, the maximum soil water content can be as high as 21%, and the vertical infiltration distance is the shortest. This implies that in this treatment the water movement in the vertical direction has been obstructed effectively and the water content in the soil above the buried layer is increased simultaneously. Meanwhile, the error of wetting front movement between experiment and simulation of HYDRUS-2D is less than 3%, suggesting the software demonstrate the behavior of wetting front movement accurately.
郑健,, 王燕,, 蔡焕杰, 张恩继,, 孙雨欣,. 秸秆颗粒形态对沟灌入渗特征影响的试验研究[J]. 排灌机械工程学报, 2016, 34(1): 66-72.
ZHENG Jian,, WANG Yan,, CAI Huanjie, ZHANG Enji,, SUN Yuxin,. Experimental investigation into effects of maize leaf and straw fragments on soil water infiltration characteristics in furrow irrigation. Journal of Drainage and Irrigation Machinery Engin, 2016, 34(1): 66-72.
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