水科学进展2016，Vol.27Issue(1)：40-48,9.DOI:10.14042/j.cnki.32.1309.2016.01.005
土壤添加物对土-水曲线和土体收缩的影响
Effects of soil additive on soil-water characteristic curve and soil shrinkage
摘要
Abstract
To explore the effects of additives on water retention and soil shrinkage characteristics, the experimental soil was mixed with the three types of additives ( wheat strew, wheat husk and plant dreg) , respectively. The soil wa-ter characteristic curves were measured by a centrifuge method, with water retention and soil shrinkage characteristic quantitatively evaluated. The results indicated there were few differences in the types of soil water characteristic curves of all treatments, and van Genuchten model was suitable for the curve fitting. Besides to increasing soil density and soil moisture, the three additives could strengthen water-retaining capacity, ranking in the order that plant dreg>wheat straw> wheat husk> pure soil. Furthermore, axial shrinkage occurred during dehydration, with the three-line model suitable for soil shrinkage curve fitting. A logarithmic function and a Logistic function were found in the relation-ship between suction and soil moisture, and soil linear ratio, respectively. Finally, the soil shrinkage was ranked in the order that wheat husk < plant dreg < wheat straw <pure soil, and the degree of soil crack in the order that plant dreg < wheat straw < wheat husk < pure soil. The results can provide theoretical guidance and reference to study on soil physics under different soil additive conditions.关键词
水分特征曲线/土壤收缩/土壤裂缝/土壤添加物Key words
soil water characteristic curve/soil shrinkage/soil crack/soil additive分类
农业科技引用本文复制引用
邢旭光,柳烨,马孝义..土壤添加物对土-水曲线和土体收缩的影响[J].水科学进展,2016,27(1):40-48,9.基金项目
国家自然科学基金资助项目(51279167) （51279167）
水利部公益性行业科研专项经费资助项目(201301016) The study is financially supported by the National Natural Science Foundation of China (No. 51279167) and the National Non-profit Research Program of China (No. 201301016) . （201301016）
