| Cite this article: | 李争争,屈忠义,杨威,等.暗管排水对鄂尔多斯地区重度盐碱地盐分迁移规律的影响[J].灌溉排水学报,0,():-. |
| li zhengzheng,qu zhongyi,yang wei,et al.暗管排水对鄂尔多斯地区重度盐碱地盐分迁移规律的影响[J].灌溉排水学报,0,():-. |
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| Effect of underground pipe drainage on salt migration in severe saline alkali soil of Ordos Region |
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li zhengzheng, qu zhongyi, yang wei, wang liping, gao xiaoyu, chen meng
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Water Conservancy and Civil Engineering College,Inner Mongolia Agricultural University
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| Abstract: |
| 【Background】Dalate Banner is an important agricultural county in Ordos City, the grain of Ordos City is mainly produced in Dalat banner. However, the wide distribution of saline alkali land in this area restricts the development of agriculture, The implementation of saline alkali land improvement is an important prerequisite for developing reserve cultivated land resources and promoting the high-quality development of agriculture in this area. Underground pipe drainage is a better measure to improve saline alkali soil, which can effectively discharge the soil salt after leaching and reduce the soil salt content.【Objective】To determinethe effect mechanism of soil salts dynamic in heavy saline-alkaline with subsurface pipe drainage in Dalat Banner of Ordos, Inner Mongolia, China. 【Method】The laying parameters of buried pipe spacing of 18 m, buried depth of suction pipe of 1.2~1.5 m and buried depth of collecting pipe of 1.8~2.0 m are set, the field plot test was carried out; those data were analyzed that soil salt content in 1 m soil layer, depth and salinity of groundwater, irrigation and drainage water quality, salt ion data and their relationship under the condition of underground pipe drainage from May to October in 2019, the method of spatial interpolation, linear regression, principal component were used to analysis. 【Result】(1)There was a medium variation for spatial distribution of soil salinity at a depth of 0~100 cm, the coefficient of variation was 25%~75%, and the type of soil salt is surface accumulation type. (2)The underground water table was increased by 50~60 cm with underground pipes. , The soil salinity at the end of the experiment was about 10% lower than that at the beginning of the experiment. (3)Main salt ions in soil were K++Na+, SO42-, Cl-, and main salt ions in underground water were K++Na+, Cl-, HCO3- under the condition of buried pipe laying. (4)After Yellow River irrigation, HCO3- increased by 56% in soil, and the content of other salt ions decreased under the condition of underground pipe laying, SO42-, K++Na+, Cl- decreased greatly, which were 36%,34%,31%. After irrigation and leaching, the contents of ions in drainage and groundwater increased, the increase range of drainage salinity is 3.43 times of that of groundwater.【Conclusion】It can control the groundwater depth and reduce the soil salt content under underground pipe was laid in the severe saline alkali soil, it can effectively promote the leaching and discharge of SO42-, K++Na+, Cl- in soil, at same time, attention should be paid to the alkalization of soil caused by HCO3 - in Yellow River irrigation. |
| Key words: subsurface drainage; soil salinity; spatial variation; groundwater; ion migration |
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