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首页> 美国卫生研究院文献>Scientific Reports >Vegetation Controls on the Spatio-Temporal Heterogeneity of Deep Moisture in the Unsaturated Zone: A Hydrogeophysical Evaluation
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Vegetation Controls on the Spatio-Temporal Heterogeneity of Deep Moisture in the Unsaturated Zone: A Hydrogeophysical Evaluation

机译：非饱和区深层水分时空异质性的植被控制：水文地球物理评价

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Information on the spatio-temporal variability of soil moisture in the vadose zone is important to assess groundwater recharge and solute transport in unconsolidated substrate as influenced by biological processes. Time-lapse electrical resistivity imaging (ERI) was used to monitor soil moisture dynamics to a depth of 9 m in a grassland, a grassland encroached by a juniper species (eastern redcedar, Juniperus virginiana), a juniper woodland and an oak forest in the south-central Great Plains, Oklahoma, USA. A site-specific relationship between moisture content and electrical conductivity data was developed for the soil zone, and a perched water zone was monitored at two of the sites. Results showed that (a) change in soil moisture content was linearly correlated to change in electric conductivity in the soil zone; (b) vegetation cover type induced differences in vertical bulk electrical resistivity (ER) profiles and influenced the temporal evolution of soil moisture profiles; and (c) juniper encroachment lowered the water level in the perched groundwater aquifer. Our results suggest land use and vegetation cover type, as opposed to rock properties, controls deep water drainage for the vegetation transition zone. Methods used to measure hydrogeophysical changes, such as ERI, can be used for broader understanding of geological, physical, and biological processes and their links in Earth’s critical zones.
机译：渗流带中土壤水分的时空变化信息对于评估受生物过程影响的未固结基质中的地下水补给和溶质运移非常重要。时延电阻率成像（ERI）用于监测草原，杜松属植物（东部红柏，杜松Jun属）侵染的草地，杜松林地和橡树林中土壤水分动态，深度达9μm。美国俄克拉荷马州中南部大平原。针对土壤区域建立了水分含量与电导率数据之间的特定位置关系，并在其中两个位置监视了栖息水区域。结果表明：（a）土壤含水量的变化与土壤区域电导率的变化呈线性关系； （b）植被的覆盖类型引起垂直体电阻率（ER）剖面的差异，并影响了土壤水分剖面的时间演变; （c）杜松侵蚀降低了栖息的地下水含水层的水位。我们的结果表明，与岩石性质相反，土地利用和植被覆盖类型控制着植被过渡带的深层排水。用来测量水文地球物理变化的方法（例如ERI）可用于更广泛地了解地球关键区域的地质，物理和生物过程及其联系。

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