南疆盐渍化土壤排盐系数及淋洗定额确定

发布时间：2019-01-10 15:18

【摘要】：针对不同的土壤盐渍化程度,采用理论计算与实测验证相结合的方法,开展了南疆盐渍化土壤排盐系数及淋洗定额的确定。结果表明,南疆地区不同盐渍化程度土壤的排盐系数不同,土壤盐分初始值为0.446%、0.588%、0.593%、0.779%、0.829%、1.039%和1.109%的沙壤土排盐系数分别为16.7、23.1、23.7、33.1、35.3、46.4和47.3。以0.1%、0.2%和0.3%作为淋洗脱盐标准,通过计算得出了不同盐渍化程度及不同淋洗深度的理论淋洗定额。以脱盐标准0.3%进行实测验证,结果表明,土壤盐分值为0.446%、0.588%、0.593%淋洗后的土壤盐分值接近脱盐标准值0.3%,说明理论淋洗定额能够满足土壤实际脱盐需求。而土壤盐分值为0.779%、0.829%、1.039%、1.109%淋洗后的土壤实际盐分值均高于脱盐标准值0.3%,说明理论淋洗定额偏小。研究结果为合理制定南疆地区农田冬春灌定额提供理论依据。
[Abstract]:According to different soil salinization degree, the method of combining theoretical calculation with actual measurement was used to determine the salt discharge coefficient and leaching quota of salinized soil in southern Xinjiang. The results showed that the salt removal coefficient of the soils with different salinization degrees was different in southern Xinjiang, and the initial salt content of the soil was 0.4460.588and 0.5930.7790.0.829. The coefficient of salt excretion in sandy soil of 1.039% and 1.109% is 16.723. 1 and 23. 733. 1 ~ 35. 3 ~ 46.4 and 47. 3, respectively. With 0.1% and 0.3% as the standard of desalination, the theoretical leaching quota of different salinization degree and different elution depth was calculated. The results showed that the soil salt value of 0.446% and 0.588% was close to the standard value of desalination 0.53% after desalination standard 0.3%, and the soil salt value was 0.446%, 0.588% and 0.593%, respectively, and the soil salt value was close to the desalination standard value of 0.3%. It shows that the theoretical leaching quota can meet the actual desalination demand of soil. The soil salt value of 0.779% and 0.829% was higher than that of the standard value of desalination, indicating that the theoretical washing quota was small. The results provide theoretical basis for rational formulation of irrigation quota in winter and spring in southern Xinjiang.
【作者单位】： 塔里木大学水利与建筑工程学院;中国农业科学院农田灌溉研究所;
【基金】：国家“十三五”重点研发计划项目(2016YFC0400208) 兵团中青年科技创新领军人才计划项目(2016BC001) 国家自然科学基金项目(31060084) 塔里木大学重大专项培育项目(TDZKPY201501)
【分类号】：S156.4
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本文编号：2406475