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砂土和黏土的颗粒差异对土壤斥水性的影响
引用本文:杨 松,吴珺华,董红艳,张燕明.砂土和黏土的颗粒差异对土壤斥水性的影响[J].土壤学报,2016,53(2):421-426.
作者姓名:杨 松  吴珺华  董红艳  张燕明
作者单位:1. 云南农业大学水利学院,昆明,650201;2. 南昌航空大学土木建筑学院,南昌,330063
基金项目:国家自然科学基金项目(51209182)资助
摘    要:斥水性土壤广泛存在于自然界中,并且对土壤环境和作物生长等有重要影响。建立理想化的土壤颗粒模型对砂土和黏土的斥水特性进行计算分析。结果表明:当接触角很小时,砂土中不存在斥水现象。随着接触角的增大,砂土斥水性与含水率密切相关,砂土的密实度对其斥水性也有重要影响,当砂土比较密实时,土壤的"亲水"与"斥水"特性对含水率特别敏感,随着含水率的变化,砂土可能由亲水性较好的土壤转变为斥水性土壤;当砂土比较松散时,土壤颗粒的斥水性对含水率并不敏感。当黏土接触角略小于90°且湿润半径b也较小时,黏土也存在斥水现象。如果黏土颗粒的接触角较小或接触角小于90°且湿润半径b较大,黏土总是亲水的。黏土含水率较大时,斥水特性由土壤颗粒的接触角决定。

关 键 词:斥水性土壤  理想模型  含水率
收稿时间:2015/4/16 0:00:00
修稿时间:8/9/2015 12:00:00 AM

Soil Water Repellency of Sands and Clay as Affected by Particle Size
YANG Song,WU Junhu,DONG Hongyan and ZHANG Yanming.Soil Water Repellency of Sands and Clay as Affected by Particle Size[J].Acta Pedologica Sinica,2016,53(2):421-426.
Authors:YANG Song  WU Junhu  DONG Hongyan and ZHANG Yanming
Institution:College of Water Conservancy, Yunnan Agricultural University,College of Civil Engineering and Architecture, Nanchang Hangkong University,College of Water Conservancy, Yunnan Agricultural University and College of Water Conservancy, Yunnan Agricultural University
Abstract:Water-repellent soils, existingwidely in nature, havesome important effects on soil environment and crop growth. In order to analyze water repellency of sand and clay, models of sand and clay different in particle size were built. Results showed that no phenomenon of water repellency was found in sand soil when the contact angle of water with sand was small. Water repellency of sand soil was closely related to soil water content when the sand-water contact angle was big. Compactness of the soil was another important factor affecting soil water repellency. When the sand soil was highly compacted,whether the soil was hydrophilic or hydrophobic wasvery sensitive to water content, and it might switch from one state to another with changing soil water content. When the sand soil was quite loose, it was no longer sensitive to soil water content. In clay soil with soil-water contact angle being slightly less than 90°and wetting radius b being small, the phenomenon of water repellency was observed. But when the clay soil was much smaller than 90°in soil-water and bigger in wetting radius b, it was hydrophilic. When the clay soil was quite high in soil water content, soil-water contact angle was the factor determining soil water repellency.
Keywords:Water repellent soil  Ideal model  Water content
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