摘要
地膜残留会改变土壤的湿润过程,进而影响土壤水分分布及有效性。通过四元二次正交旋转组合试验,分析土壤湿润锋运行时间与土壤初始含水率、土壤干容重、残膜含量、残膜埋深的相关关系。结果表明:初始含水率、土壤干容重和残膜含量是显著影响湿润锋运移时间的主要因素,因素影响大小顺序依次为:初始含水率>土壤干容重>残膜含量;湿润锋运移时间随土壤干容重和残膜量的增加而增加,随初始含水率的增加直线减小。交互效应分析显示:当残膜量大于150 kg/hm2时,随着土壤容重的增加,湿润锋运移时间保持稳定趋势;当土壤干容重大于1.41 g/cm3时,湿润锋运移时间随残膜含量的增加逐渐减小。可见,残膜对土壤湿润锋下移具有一定的阻塞作用,在一定条件还具有导流作用。
The residual plastic film will directly change the wetting process and affect the moisture in the soil distribution and effectiveness.By applying the quaternary quadratic orthogonal rotation combination test,significant regression equations between the soil wetting front running time and the initial soil moisture content,the soil dry density,the residual film content,the buried depth of residual film are respectively obtained and the interactive response analyses are conducted by the regression analysis and significance test.The results show that the initial moisture content,soil dry density and residual film content are the main factors affecting the wetting front migration time.And influence size orders of the three factors are follows:the initial moisture content>the soil dry density>the residual film content.The soil wetting front migration time increases gradually with the increase in the soil dry density and the residual film content.The wetting front migration time presents the linear decrease tendency with the increase in the initial moisture content.The interaction analysis shows that when the residual film content is greater than 150 kg/hm2,the wetting front migration time remain stable throughout with the increase in the soil dry density.When the soil dry density is greater than 1.41 g/cm3,the wetting front migration time decreases with the increase in the residual film content.It can be seen that the residual film not only has a blocking effect on the wetting front,but also has a flow effect.
作者
曹俊豪
李援农
谷晓博
陈朋朋
CAO Jun-hao;LI Yuan-nong;GU Xiao-bo;CHEN Peng-peng(Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas,Ministry of Education,Northwest Agricultural and Forestry University,Yangling 712100,Shaanxi Province,China)
出处
《中国农村水利水电》
北大核心
2020年第1期26-30,35,共6页
China Rural Water and Hydropower
基金
公益性行业科研专项资助项目(201503105)
国家高技术研究发展计划资助项目(2011AA100504)。
关键词
残膜
湿润锋
埋深
干容重
含水率
buried depth
moisture content
residual plastic film
dry density
wetting front
