| 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 |
| Key Words: saline soil soil salt cultivated land waste land sandy land prediction model |
| Author Name | Affiliation | | WANG Yinhuan | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot 010018, China | | LIU Xia | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot 010018, China | | HU Xiaodong | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot 010018, China | | QIAO Tian | College of Water Conservancy and Civil Engineering, Inner Mongolia Agricultural University, Huhhot 010018, China |
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| Abstract: |
| 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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