| 王银环,刘霞,胡小东,乔天.盐渍化灌区耕地-荒地-沙地水盐分布及盐分累积特征[J].干旱地区农业研究,2020,38(4):207~214 |
| 盐渍化灌区耕地-荒地-沙地水盐分布及盐分累积特征 |
| Water and salt distribution and salt accumulation characteristics of cultivated\|waste\|sandy lands in salinized irrigated area |
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| DOI：10.7606/j.issn.1000-7601.2020.04.26 |
| 中文关键词: 盐渍土 土壤积盐量 耕地 荒地 沙地 预测模型 |
| 英文关键词:saline soil soil salt cultivated land waste land sandy land prediction model |
| 基金项目:国家自然基金（51869019）;国家科技计划项目（2016YFC0501301） |
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| 中文摘要: |
| 以河套灌区不同利用类型土地为研究对象，旨在探究耕地、荒地、沙地土壤水分变异及土壤积盐特征与盐分离子对土壤积盐量的影响。结果表明：耕地、荒地、沙地土壤水分分布不均，含水率变异系数随土层深度加深而减小，沙地表层变异性较大，变异系数为104.5%；耕地积盐主要集中在春季和秋季收获期,春汇后土壤脱盐约2.1 t·hm-2，灌水间歇期毛管作用下土壤积盐约0.76 t·hm-2；荒地70%盐分聚积在表层，春汇后最多可积聚39.85 t·hm-2；耕地积盐量与荒地积盐量呈显著负相关关系，与沙地积盐量呈显著正相关关系,相关系数分别为-0.249、0.712；HCO-3、Na+在耕、荒地间随水移动性较强，耕、沙地间SO2-4、Mg2+随水移动性较强。主成分分析表明影响耕地积盐量主要是SO2-4和Cl-,影响荒地和沙地积盐量主要是Na+和Cl-。采用逐步回归分析方法建立耕、荒、沙地1.2 m深土壤积盐回归预测模型。 |
| 英文摘要: |
| The different land uses in Hetao irrigation area were studied to explore the soil water variation, the characteristics of soil salt accumulation and the effect of salt ions on salt accumulationin soil. The results showed that the distribution of soil water was uneven, the coefficient of variation of water content decreased with the depth of soil layer, and the coefficient of variation was 104.5%. The salt accumulation of cultivated land wasmainly concentrated in spring and autumn harvest period.After the spring harvest, the soil desalting was about 2.1 t·hm-2, the soil salt accumulation of capillary action was about 0.76 t·hm-2,70% of salt accumulated in the surface layer in wasteland. After the spring harvest, the maximum salt accumulation was 39.85 t·hm-2. There was a significant negative correlation between salt accumulation in cultivated land and salt accumulation in uncultivated land, and a significant positive correlation between salt accumulation in sandy land and salt accumulation. The correlation coefficients were -0.249 and 0.712, respectively.The SO2-4 and Mg2+ were highly mobile with water in cultivated sandy land. Principal component analysis showed that SO2-4 and Cl-were the main factors affecting salt accumulation in cultivated land, and Na+ and Cl- were the main factors affecting salt accumulation in wasteland and sandy land. Salt accumulation in 1.2 m deep soil in cultivated sandy land was established by stepwise regression analysis. |
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