【摘要】 本文实验研究了水质对土壤持水特性的影响。结果表明实验水质对粉壤土与粉质粘壤土的持水特性均有影响;水质对粉质粘壤土在近饱和段的土壤持水特性影响相对较小,水质主要是通过影响近饱和段土壤结构影响土壤持水特性。选取m=1-1/n与m=1-2/n的van Genuchten模型均可以很好的拟合实验土壤的持水测试数据,相关系数均大于0.99;van Genuchten模型的拟合参数(θ_s、α与n)可以反映水质对土壤持水特性影响。在进行土壤水分数值模拟时,应考虑水质对近饱和段土壤持水特性的影响。更多还原

【Abstract】 Impact of water quality on soil water retention is researched.The result of experiment indicts that water quality mainly affect soil water retention of silty loam and silt clay loam near saturation.Effects of water quality on water holding characteristic of silt clay loam is less significant than silty loam.Data of measured soil water retention can be well fitted by van Genuchten model with shape parameter of m=1-1/n and m=1-2/n,and R~2 is larger than 0.99.Effects of water quality on soil water retention can be denoted by the related regression parameters (θ_s,αand n)of van Genuchten model.Effects of water quality on soil water retention near saturation should be well considered when simulating soil water distribution.更多还原