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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Detection of soil moisture and vegetation water abstraction in a Mediterranean natural area using electrical resistivity tomography.
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Detection of soil moisture and vegetation water abstraction in a Mediterranean natural area using electrical resistivity tomography.

机译：使用电阻层析成像技术检测地中海自然地区的土壤水分和植被水提取情况。

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摘要

Vegetation growth in semiarid, Mediterranean ecosystems is greatly dependent on moisture availability in the soil, as little precipitation is available during the growing season. Predicting the effects of climate change on vegetation development requires understanding of the exact relation between climate, moisture availability, and plant growth. Accurate moisture measurements in naturally vegetated areas are difficult because of high spatial variability and because of the coarse, shallow soils. In this study, we evaluated the possibilities of using Electrical Resistivity Tomography (ERT) to measure soil moisture availability and plant water use in a Mediterranean natural area. We found that ERT is a useful tool for measuring soil conditions, providing information on the spatial patterns within the soil and reaching depths otherwise inaccessible. In heterogeneous soils, we differentiated between lithological and moisture effects in the measurements using multitemporal data. Absolute calibration to moisture content was sometimes possible, but strongly location dependent. Based on the ERT measurements, we found that although the soils in the study area are shallow and rocky, plant roots penetrate deeply into the fractured and weathered bedrock, and vegetation subtracts water from depths down to 6 m and below. This information is important for understanding the plant-soil relations and modeling vegetation development. We conclude that ERT provides crucial information on soil moisture processes unavailable using any other currently available measurement method.
机译：在半干旱的地中海生态系统中，植被的生长很大程度上取决于土壤中的水分供应，因为在生长季节几乎没有降水。预测气候变化对植被发展的影响，需要了解气候，水分供应和植物生长之间的确切关系。由于高的空间变异性和粗糙，浅薄的土壤，很难在自然植被地区进行准确的水分测量。在这项研究中，我们评估了使用电阻层析成像（ERT）来测量地中海自然地区土壤湿度和植物水分利用的可能性。我们发现，ERT是测量土壤状况的有用工具，可提供有关土壤内部空间格局以及到达否则无法到达的深度的信息。在非均质土壤中，我们在使用多时相数据的测量中区分了岩性和水分效应。有时可以对水分含量进行绝对校准，但是强烈依赖于位置。根据ERT的测量，我们发现，尽管研究区域的土壤浅而多岩石，但植物根深深地渗透到破碎且风化的基岩中，植被从6m及以下的深度中减去水分。这些信息对于理解植物与土壤的关系以及对植被发育进行建模非常重要。我们得出结论，ERT提供了使用任何其他当前可用的测量方法无法获得的有关土壤水分过程的重要信息。

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