| Cite this article: | 段国秀,贾小旭,白晓,等.基于ERT的黄土高原小流域典型坡地和坝地土壤储水量反演[J].灌溉排水学报,2022,():-. |
| DUANGUOXIU,JIA XIAO XU,BAI XIAO,et al.基于ERT的黄土高原小流域典型坡地和坝地土壤储水量反演[J].灌溉排水学报,2022,():-. |
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| DOI： |
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| Spatial distribution of soil water on slope land & dam land in loess region based on ERT |
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DUANGUOXIU1,2,3, JIA XIAO XU1,2,3, BAI XIAO4,5,6, LIU CHENG GONG1,2,3, WEI XIAO RONG4,5,6
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1.Key laboratory of Ecosystem Network Observation &2.Modeling, Institute of Geographic Sciences &3.Natural Resources Research;4.College of Resources &5.Environment, Northwest A &6.F University
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| Abstract: |
| 【Objective】Soil moisture is the main limiting factor of vegetation restoration and sustainability in arid and semi-arid loess regions. Sloping land and dam land are typical geographical units of small watershed on loess Plateau. It is of great significance for ecological restoration and agricultural production of small watershed to grasp the quantity and spatial distribution characteristics of soil water in deep layer (>10 m) of sloping land and dam land. 【Method】The Electrical resistivity tomography (ERT) method is used to measure the soil resistivity of typical sloping and dam plots in Liudaogou small watershed of northern Shaanxi Province. Combining with the measured soil volumetric water content (θv), the power function relation between ρ and θv is established. The water storage and its spatial distribution characteristics of 0~12.5 m section on slope and dam land are quantified. 【Result】The ρ distribution of slope is significantly affected by slope position, Along the slope, the ρ distribution is slope top > slope middle > slope bottom, which is related to vegetation water consumption and precipitation redistribution process on slope surface; The distribution pattern of ρ in the vertical direction of dam land is “high?low?high”, which is related to the process of water absorption of the root system and precipitation recharge; The results of ERT inversion show that the dam land has obvious saturated and unsaturated layers, while the slope land is all unsaturated layers; At 0~6.5 m unsaturated layer soil water storage is 1.49×104 m3 in dam land with an area of 1.8×104 m2, and at 6.5~12.5 m saturated layer water storage is 5.10×104 m3; The soil water storage of 0~12.5 m on the slope with similar area is 2.59×104 m3. 【Conclusion】The water storage capacity of the dam land is 2.6 times that of the slope land, which indicates that the dam land in the small watershed of the Loess Plateau contains abundant water resources. ERT can be used for quantitative research on spatiotemporal variation of soil moisture in typical geographical units of the Loess Plateau. And compared with small watershed slope land, dam land is rich in water storage, and the “soil reservoir” has stronger regulation and storage function. It is of great application value to clarify the formation process and mechanism of water resources in dam land for small watershed agricultural production and ecological construction. |
| Key words: the Loess Plateau; Electrical resistivity tomography (ERT); Soil resistivity; slope land; dam land; Soil water storage |
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