黄土区坡地和坝地土壤电阻率分布特征及应用
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S152.7

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中国科学院战略性先导科技专项(XDB40020305)资助


Distribution and Application of Soil Electrical Resistivity in Slope Land and Dam Land in the Loess Region
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Strategic Priority Research Program of the Chinese Academy of Sciences(XDB40020305)

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    摘要:

    土壤水分的准确高效测定是土壤水文学研究的重要基础,以土壤电学性质为基础的电阻率成像法(ERT)为土壤水分信息获取提供了新的技术手段。为探究ERT在黄土区土壤水文过程研究中的可行性,利用高密度电法仪测定了陕北六道沟小流域典型坡地和坝地剖面土壤电阻率(ρ),分析了不同土地利用方式下ρ二维分布特征,探讨了ERT在黄土区土壤水分及地下水监测研究方面的应用。结果表明:坡地土地利用方式和坡位对ρ具有显著影响,剖面平均ρ由高到低依次为:柠条灌木地>苜蓿草地>撂荒草地>农耕地,坡顶ρ显著高于坡底,这与土壤含水量高低有密切关系。坝地ρ具有明显的水平和垂直分异特征,垂直方向呈高阻层—低阻层—高阻层分布,低阻层上边界与浅层地下水位一致。在坝地尾部,低阻层厚度增加并穿透浅层高阻层,可能与尾部作物耗水较少有关。ERT可用于黄土区不同土地利用方式下土壤干湿状况及坝地地下水动态监测研究。

    Abstract:

    [Objective] Soil moisture is one of the most important factors for plant growth and solute transport in arid and semi-arid areas. An accurate and effective measurement of profile soil moisture is a critical issue of soil hydrology. The technology of electrical resistivity tomography (ERT) based on soil electrical properties provides a new geophysical method for measuring soil moisture content in the profile, which has been widely applied in the studies of soil water dynamics, groundwater recharge and root-water interactions in many regions in the world. However, little is known yet about the applicability of ERT to monitoring soil moisture or groundwater in the loess area, and the lack of information on profile soil resistivity (ρ) as affected by land use inhibits progress of the research on hydro-geophysics. This study was conducted to (1) explore characteristics of profile ρ, as affected by land use and slope position, in slope land and dam land in the northern part of the Loess Plateau, (2) determine effects of slope position and land use type on ρ and (3) examine applicability of ERT to monitoring soil moisture and groundwater dynamics in the loess area.[Method] Profile ρ in slope lands and dam land, different in land use type (including cropland, natural grassland, artificial grassland and caragana shrubland) was measured with a high-density ERT (Advanced Geosciences, Inc.) in the Liudaogou catchment in the northern part of the Loess Plateau. Variation of profile ρ with land use type and slope position was analyzed with ANOVA.[Results] Results show that land use type and slope position had significant effects on ρ in slope land. In terms of mean profile ρ, lands different in land use type followed an order of caragana shrubland > artificial grassland > natural grassland > cropland. Furthermore, mean profile ρ was the lowest in the bottom of the slope, followed by the middle and top of the slope. These findings suggest that profile ρ was closely related to soil moisture condition. Profile ρ in the dam land exhibited obvious horizontal and vertical variation in distribution. Vertically, ρ displayed a curve of high-low-high from the top to the deep loess layer, and the upper boundary of the low-resistance zone was consistent with the table of shallow groundwater in the dam land, while horizontally, profile ρ was closely related to land use type and geological position. Compared with the head dam land, the tail dam land had a low-resistance zone significantly thicker and penetrating the high-resistance zone in the shallow soil layer, which may be ascribed to crops' lower water consumption.[Conclusion] Spatial distribution of profile ρ varies significantly with land use type and slope position in the loess area. The geophysical method of ERT is recommended for monitoring and studying spatial and temporal characteristics of dry and wet conditions of soil profiles different in land use type, as well as shallow groundwater dynamics in the loess area of China. It can also be used to study relationships between precipitation, vegetation, soil moisture and groundwater, particularly for areas thick in sediment deposits.

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刘成功,贾小旭,赵春雷,邵明安.黄土区坡地和坝地土壤电阻率分布特征及应用[J].土壤学报,2022,59(1):139-147. DOI:10.11766/trxb202004260196 LIU Chenggong, JIA Xiaoxu, ZHAO Chunlei, SHAO Mingan. Distribution and Application of Soil Electrical Resistivity in Slope Land and Dam Land in the Loess Region[J]. Acta Pedologica Sinica,2022,59(1):139-147.

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  • 收稿日期:2020-04-26
  • 最后修改日期:2020-06-24
  • 录用日期:2020-10-12
  • 在线发布日期: 2020-12-08
  • 出版日期: 2022-01-11