| Spatial and temporal variations of soil moisture of gully cultivated land in the loess hilly and gully region |
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| DOI：10.7606/j.issn.1000-7601.2022.04.18 |
| Key Words: the loess hilly and gully region gully control and land consolidation gully soil moisture spatial and temporal variation |
| Author Name | Affiliation | | WANG Jing | Institute of Water Resources and Hydro\|Electric Engineering, Xi’an University of Technology, Xi’an, Shaanxi 710048, China
Shaanxi Provincial Land Engineering Construction Group Co. Ltd., Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural and Resources, Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Land Engineering Technology Innovation Center, Ministry of Natural Resources, Xi’an, Shaanxi 710075, China | | BAI Qingjun | Institute of Water Resources and Hydro\|Electric Engineering, Xi’an University of Technology, Xi’an, Shaanxi 710048, China | | WANG Huanyuan | Shaanxi Provincial Land Engineering Construction Group Co. Ltd., Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural and Resources, Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Land Engineering Technology Innovation Center, Ministry of Natural Resources, Xi’an, Shaanxi 710075, China | | LEI Na | Shaanxi Provincial Land Engineering Construction Group Co. Ltd., Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural and Resources, Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Land Engineering Technology Innovation Center, Ministry of Natural Resources, Xi’an, Shaanxi 710075, China | | HE Jing | Shaanxi Provincial Land Engineering Construction Group Co. Ltd., Shaanxi Provincial Land Engineering Construction Group Co., Ltd., Key Laboratory of Degraded and Unused Land Consolidation Engineering, Ministry of Natural and Resources, Shaanxi Provincial Land Consolidation Engineering Technology Research Center, Land Engineering Technology Innovation Center, Ministry of Natural Resources, Xi’an, Shaanxi 710075, China |
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| Abstract: |
| The characteristics of spatial and temporal variation of soil moisture in gully were discussed to provide scientific basis for the rational allocation, efficient utilization of water resources and agricultural management in the Loess Plateau. Soil hydrodynamic parameters were measured based on the Van Genuchten model. The fixed\|point monitoring method for observing soil moisture at different positions in gully and on control slope was used to analyze the temporal and spatial variation characteristics of soil moisture in the gully control and land consolidation project in Yan’an City and clarify the impact of the project on the soil moisture in the gully. The results showed that: (1) The soil hydraulic parameters changed significantly at the depth of around 40 cm of gully. The soil bulk density of layer 0~40 cm in the gully was 1.12 ~1.25 g·cm-3, and the hydraulic conductivity was more than 40 mm·min-1, indicating the characteristics of stronger infiltration capacity and higher saturated moisture content. While the soil bulk density of layer below 40 cm was about 1.5 g·cm-3, the hydraulic conductivity was 1.25~1.41 mm·min-1, and the infiltration rate was significantly reduced. (2) The soil water content of the gully was significantly greater than that of the control slope. Its seasonal variation characteristics were slightly lagging behind the falling seasonal, and it was fluctuate from 15.76% to 21.91% and it was about 5% higher than control slope in the whole growing season. The vertical distribution increased with the increase of soil depth, the lowest was 15.07% in the surface layer and the highest was 22.84% in 160 cm. The advantage of deep soil water content was significant. The variation coefficient of soil moisture in gully was between 0.131 and 0.234. Compared with slopes, the soil moisture below the surface of gully had strong spatial heterogeneity and changed actively below 100 cm with the variation coefficient being about 0.2. (3) The soil water content of the exit of the gully was significantly higher than that of the head of the gully, and the soil water content below 40 cm at the entrance reached or even exceeded the field water capacity for a long time. Through the comprehensive water control system in gully control and land consolidation project, the gully cultivated land could provide sufficient water conditions for crop growth and improve utilization efficiency of water resources and at the same time, agricultural ecological environment. |
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