Global Patterns of Groundwater Table Depth
Global Patterns of Groundwater Table Depth
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DOI：
10.1126/science.1229881
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发表时间：
2013-02-22
期刊：
影响因子：
56.9
通讯作者：
Miguez-Macho, G.
中科院分区：
文献类型：
--
作者：
Fan, Y.;Li, H.;Miguez-Macho, G.
浅层地下水通过在无雨情况下维持河流基流和根区土壤水而影响陆地生态系统，但人们对地下水位深度的全球模式以及浅层地下水在何处为陆地生态系统提供重要支持知之甚少。我们提出了从政府档案和文献中汇编的地下水位深度的全球观测结果，并填补了数据空白，并使用现代气候，地形和海平面迫使地下水模型来推断模式和过程。地下水位深度的模式解释了全球范围内的湿地模式和区域和地方范围内的植被梯度。总体而言，浅层地下水影响了全球陆地面积的22%至32%，其中15%为地下水供水的地表水特征，7%至17%为地下水位或植物生根深度内的毛细边缘。
Shallow groundwater affects terrestrial ecosystems by sustaining river base-flow and root-zone soil water in the absence of rain, but little is known about the global patterns of water table depth and where it provides vital support for land ecosystems. We present global observations of water table depth compiled from government archives and literature, and fill in data gaps and infer patterns and processes using a groundwater model forced by modern climate, terrain, and sea level. Patterns in water table depth explain patterns in wetlands at the global scale and vegetation gradients at regional and local scales. Overall, shallow groundwater influences 22 to 32% of global land area, including similar to 15% as groundwater-fed surface water features and 7 to 17% with the water table or its capillary fringe within plant rooting depths.