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《Journal of Soil and Water Conservation》 2017-04
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Soil Infiltration Process and Model Analysis of Field Mulched with Different Thickness of Gravel-Sand in Ningxia

BAI Yiru;ZHAO Yunpeng;WANG Youqi;ZHANG Xing;College of Resources and Environmental Science,Ningxia University;Ningxia(China-Arab)Key Laboratory of Resource Assessment and Environment Regulation in Arid Region;  
Soil water infiltration process of field mulched by different thickness of gravel-sand in arid area of central Ningxia was studied by one-dimensional vertical water infiltration method.This study selected the gravel-sand thickness as the impact factor,and set five levels of thickness(0,6,9,12,and 15cm).The variation laws of wetting front movement and infiltration amount were observed,the infiltration characteristics of each treatment were compared,and the infiltration process was simulated using model fitting in this study.The results indicated that gravel-sand mulching improved soil water infiltration capacity,soil wetting front distance and infiltration volume increased significantly.Compared with CK,the cumulative infiltration increased by 4.3%,11.8%,12.8%and 17.1% under gravel-sand thickness of 6,9,12 and 15cm,respectively,and average infiltration rate increased by 25.8%,38.7%,50.0% and 62.9%,respectively.Meanwhile,gravel-sand mulching changed the soil water infiltration curve.As the increasing of the gravel-sand thickness,the initial infiltration rate grew rapidly,while the steady infiltration rate increased slowly.Compared with CK,the initial infiltration rate raised by 40%,81%,91% and 110% under gravel-sand thickness of 6,9,12and15 cm,respectively,and the steady infiltration rate increased by 15.3%,17.9%,20.5% and 25.6%,respectively.The Kostiakov model,Horton model and Philip model were used to simulate the soil infiltration process,and the results indicated that Horton model fit better(R20.98)than the rest two models,and it was more suitable to analyze and predict the soil infiltration process under different thickness of gravel-sand mulching in the northwestern arid area.
【Fund】: 国家自然科学基金项目(41461104);; 宁夏自然科学基金项目(NZ16026)
【CateGory Index】: S152.7
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