【摘要】：針對不同的土壤鹽漬化程度,采用理論計算與實測驗證相結(jié)合的方法,開展了南疆鹽漬化土壤排鹽系數(shù)及淋洗定額的確定。結(jié)果表明,南疆地區(qū)不同鹽漬化程度土壤的排鹽系數(shù)不同,土壤鹽分初始值為0.446%、0.588%、0.593%、0.779%、0.829%、1.039%和1.109%的沙壤土排鹽系數(shù)分別為16.7、23.1、23.7、33.1、35.3、46.4和47.3。以0.1%、0.2%和0.3%作為淋洗脫鹽標(biāo)準(zhǔn),通過計算得出了不同鹽漬化程度及不同淋洗深度的理論淋洗定額。以脫鹽標(biāo)準(zhǔn)0.3%進行實測驗證,結(jié)果表明,土壤鹽分值為0.446%、0.588%、0.593%淋洗后的土壤鹽分值接近脫鹽標(biāo)準(zhǔn)值0.3%,說明理論淋洗定額能夠滿足土壤實際脫鹽需求。而土壤鹽分值為0.779%、0.829%、1.039%、1.109%淋洗后的土壤實際鹽分值均高于脫鹽標(biāo)準(zhǔn)值0.3%,說明理論淋洗定額偏小。研究結(jié)果為合理制定南疆地區(qū)農(nóng)田冬春灌定額提供理論依據(jù)。
[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.
【作者單位】： 塔里木大學(xué)水利與建筑工程學(xué)院;中國農(nóng)業(yè)科學(xué)院農(nóng)田灌溉研究所;
【基金】：國家“十三五”重點研發(fā)計劃項目(2016YFC0400208) 兵團中青年科技創(chuàng)新領(lǐng)軍人才計劃項目(2016BC001) 國家自然科學(xué)基金項目(31060084) 塔里木大學(xué)重大專項培育項目(TDZKPY201501)
【分類號】：S156.4
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本文編號：2406475