摘要
为了探究土壤斥水性与含水率的关系,采用滴水渗透时间法进行室内试验,基于理想土壤颗粒模型,通过接触角变化进行理论分析,研究了不同含水率下砂土斥水性质的变化规律。结果表明:砂土斥水性随含水率的增大表现出以1.5%~2%含水率范围为拐点的先增大后减小的单峰曲线变化趋势;砂土自身斥水强度越高,其斥水持续时间的峰值越大,对应的土壤含水率值越小,且表现出斥水性质的下阈值含水率也相对越小;滴水渗透时间法和接触角法对土壤斥水性的判定存在差异,其实质是二者分别从土壤的斥水持久性和斥水强度两个角度对斥水性质进行评价。以上研究结果可为斥水土壤的研究奠定基础。
In order to explore the relationship between soil water repellency and moisture content, change rules of sand water repeUency under different moisture content was studied through indoor test by using the water drop penetration time method, and the theory analysis of contact angle change was conducted based on the ideal soil particle model. The results showed that ： with the increase of water content, the sand water repellency showed a single peak curve trend of first increase and then decrease with 1.5%~2% moisture content as the turning point; the higher the intensity of sand water repellency, the bigger the peak value of WDPT, the smaller corresponding moisture content value, and the lower the threshold moisture content of water repeUency. There are differences between water drop penetration time method and contact angle method for soil water repellency, and the essence is that the two methods evaluate the water repellency from two different aspects, namely the permanence of water repellency and the strength of water repellency. The above results can lay a foundation for the research of water repellent soil.
出处
《节水灌溉》
北大核心
2017年第8期13-16,20,共5页
Water Saving Irrigation
基金
国家自然科学基金资助项目(51409221
51349001)
西北农科技大学基本科研业务费(2452017116)
关键词
土壤斥水性
含水率
理想土壤颗粒模型
滴水穿透时间
接触角
基质吸力
soil water repellency
moisture content
ideal soil particle model
water drip penetration time
contact angle
matric suction
