Effects of initial soil moisture content on soil water and nitrogen transport under muddy water film hole infiltration  

作　　者：Lihua Liu Liangjun Fei Lin Chen Kun Hao Quanju Zhang 

机构地区：[1]State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an 710048,China [2]Institute of Water Resources and Hydro-electric Engineering,Xi’an University of Technology,Xi’an 710048,China

出　　处：《International Journal of Agricultural and Biological Engineering》2021年第4期182-189,共8页国际农业与生物工程学报（英文）

基　　金：This study was financially supported by the National Key Research and Development Program of China(Grant No.2016YFC0400204);the National Natural Science Foundation of China(Grant No.52079105,51779205 and 51479161);and the Public welfare industry research special project(Grant No.201203003);The authors acknowledge the anonymous reviewers and the editor for their valuable comments and suggestions.

摘　　要：Film hole irrigation has been widely adopted as an effective water-saving irrigation technology in the arid and semiarid areas of China.To investigate the effects of initial soil moisture content(θ0)on soil water and nitrogen transport characteristics under muddy water film hole infiltration,the laboratory experiments were conducted with muddy water film hole infiltration,using five initial soil moisture content treatments.The models for describing the relationships between the cumulative infiltration(I(t))and infiltration duration(t);the relationship among the horizontal and vertical migration distances of the wetting front(Fx,Fz),θ0 and t,were established.The results showed that the initial soil moisture content had a significant effect on I(t),Fx,Fz and moisture content distribution in the wetted body.The change of I(t)over t conformed to Kostiakov model.With the increase ofθ0,the infiltration coefficient(K)gradually decreased.NO-3-N was mainly distributed in the range of the wetting radius of 15 cm,while NH+4-N was mainly distributed in the range of the wetting radius of 8 cm.This study can provide a theoretical basis and technical support for film hole irrigation.

关 键 词：film hole irrigation muddy water initial soil moisture content water and nitrogen transport water redistribution 

分 类 号：S15[农业科学—土壤学]