摘要
通过人工配制不同质地土壤,测定土壤水分特征曲线,研究了土壤中砂粒含量对其水分蓄持能力的定量影响。结果表明:(1)砂粒含量对土壤水分蓄持能力有较大影响,土壤持水能力随砂粒含量增加递减,表征土壤持水能力的水分特征曲线Gardner模型参数及表征土壤饱和含水量的Van Genuchten模型参数均随砂粒含量增加逐渐减小。(2)砂粒含量对土壤比水容量有较大影响,试验土壤在任一吸力水平下的比水容量值均随其砂粒含量增加递减。(3)试验土壤饱和含水量与砂粒含量呈线性关系,田间持水量、凋萎系数与砂粒含量都呈开口向下抛物线右半段的关系。(4)试验土壤有效水、迟效水含量随砂粒含量增加递减,二者与砂粒含量均呈开口向下抛物线右半段的关系。易效水含量与砂粒含量呈开口向上抛物线关系。
This research studied the quantitative effects of sand content on soil water-holding capacity by compounding different texture of soil. The results showed that： （1） Sand content had a great effect on soil water holding capacity. Soil water holding capacity was decreased with the increase of sand content. The parameters of Gardner soil water characteristic curve model A （stand for water holding capacity） and Van Genuehten model （stand for saturated water content） went down with the increase of sand content. （2） Soil sand content had a great effect on specific water capacity. The specific water capacity of experimental soils decreased with the increase of sand content at any water suction level. （3） The saturated water content of experimental soils had liner relationship with sand content. Field capacity and wilting coefficient both have right segment of down opening quadratic parabola relationship with sand content. （4） Available water and resistant available water content of experimental soils decreased with sand increasing. Both of them have right segment of down opening quadratic parabola relationship with sand content. Quickly available water have right segment of up opening quadratic parabola relationship with sand content.
出处
《水土保持学报》
CSCD
北大核心
2009年第3期204-208,共5页
Journal of Soil and Water Conservation
基金
国家“863”计划项目(2006AA100204)
新世纪优秀人才支持计划(01140602)
国家自然科学基金课题“黄土高原小流域降雨径流调控利用潜力动态分析与优化配制研究”(40701092)
关键词
土壤砂粒含量
水分蓄持能力
水分特征曲线
soil clay content
water holding capacity
water characteristic curve
