| 引用本文: | 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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| 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 |
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李争争, 屈忠义, 杨威, 王丽萍, 高晓瑜, 陈蒙
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内蒙古农业大学水利与土木建筑工程学院
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| 摘要: |
| 【目的】探究暗管排水对鄂尔多斯市达拉特旗重度盐碱地土壤盐分运移的影响机制。【方法】按照暗管间距18 m、吸水管埋深1.2~1.5 m、集水管埋深1.8~2.0 m的参数，铺设暗管进行田间小区试验，利用空间插值、线性回归、主成分分析等统计方法，对2019年5—10月暗管排水条件下1 m土层的土壤含盐量、地下水埋深、地下水矿化度、灌排水水质、盐分离子等数据及其相互关系进行分析。【结果】（1）试验区1 m土层的盐分空间分布属于中等变异（25%~75%），土壤盐分类型为表聚型。（2）铺设暗管使地下水埋深增加了50~60 cm，试验结束时土壤盐分较试验开始时土壤盐分平均降低10%左右。（3）暗管铺设条件下，土壤盐分的主导离子为K++Na+、SO42-和Cl-，地下水中主导离子为K++Na+、Cl-和HCO3-。（4）暗管铺设下黄河水灌溉后，土壤中HCO3-量增加56%，而其他盐离子量降低，SO42-、K++Na+、Cl-降幅较大分别为36%、34%、31%；灌水淋洗后，排水、地下水中各离子量均增加，排水矿化度增加幅度是地下水矿化度增加幅度的3.43倍。【结论】重度盐碱地铺设暗管，能控制地下水埋深，并降低土壤含盐量，有效促进土壤中SO42-、K++Na+、Cl-的淋洗排出，但同时要注意黄河水灌溉中HCO3-可能引起的土壤碱化问题。 |
| 关键词: 暗管排水;土壤盐分;空间变异;地下水;离子迁移 |
| DOI： |
| 分类号:S276.7 |
| 基金项目:内蒙古科技计划项目（201702108）；国家自然科学基金项目（51769022 ，51809142） |
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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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