| Analyzing water\|salt dynamics in typical cultivated and wasteland in Hetao irrigation district of Inner Mongolia |
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| DOI：10.7606/j.issn.1000-7601.2022.01.09 |
| Key Words: cultivated land saline wasteland soil water content soil salinity groundwater level soil water\|salt dynamics Hetao irrigation district |
| Author Name | Affiliation | | YUAN Chengfu | College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou, Jiangsu 225009, China
College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China | | FENG Shaoyuan | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China | | ZHUANG Xudong | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China | | QIAN Zheng | College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang, Jiangxi 330045, China |
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| Abstract: |
| This study was conducted at a typical study area with cultivated land and saline wasteland in Yongji irrigation area of Hetao irrigation district to explore the water\|salt balance mechanism. The soil water content, soil salinity, groundwater depth and groundwater salinity were observed in field experiments. The water\|salt dynamic and main influencing factors in cultivated wasteland were analyzed and discussed on the “dry drainage” effect of saline wasteland on cultivated land. The results showed that soil water content of cultivated land changed more obviously compared with soil water content of saline wasteland. The main influencing factors of soil water content for cultivated land were irrigation and rainfall, crop growth, groundwater depth and soil texture. The main influencing factors of soil water content for saline wasteland were irrigation of cultivated land and groundwater depth. The soil salinity of cultivated land was less than 3.5 g·kg-1, which was slightly salinized soil. The saline wasteland had high soil salinity and the soil salinity was 4.0~10.0 g·kg-1 in the central area of saline wasteland, which was severely salinized soil. The main influencing factors of soil salinity were irrigation and crop growth for cultivated land. The main influencing factors of soil salinity were topographic geomorphology and groundwater depth for saline wasteland. The groundwater depth in saline wasteland was lower than that in cultivated land. The groundwater salinity was less than 3.0 g·L-1 in cultivated land, which was brackish water. The groundwater salinity was about 8.5 g·L-1 in the central area of saline wasteland, which was severely saline water.The saline wasteland, distributing in the cultivated land gap, was the drainage area for cultivated land when the surface water drainage system was absent. |
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