Land use as possible strategy for managing water table depth in flat basins with shallow groundwater
Land use as possible strategy for managing water table depth in flat basins with shallow groundwater
复制标题
土地利用作为管理浅层地下水平坦盆地地下水位深度的可能策略
DOI：
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
E. Jobbágy
中科院分区：
文献类型：
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作者：
Pablo E. García;Angel N. Menénendez;G. Podestá;F. Bert;P. Arora;E. Jobbágy
平原区地下水影响着农业生产成果和风险。然而，农业土地使用决定可能会对可用于生产的地下水水位产生重大影响。本文探讨了在阿根廷潘帕斯草原的萨拉多河流域，一个非常平坦的地区，在世界农业生产中发挥着关键作用的土地利用决策管理地下水位的范围。采用MIKE SHE软件实现的空间分布式水文模型，建立了不同土地利用方式对地下水动态的影响，并评估了共享同一地下水位（WT）的空间近距离决策者之间的相互依赖关系。此外，地下水水位的变化，以应对气候变化进行了量化。我们发现土地利用对WT水平有很强的影响，既为自己（例如，牧场可以导致显着降低（高达4.5米）WT水平）和其他人，在农民之间存在的强烈的相互依赖性的形式共享WT一个农民的土地利用决策影响相邻农场的地下水位，反之亦然。 然而，通过土地利用决策控制地下水位的有效性受到降雨量变化的不可预测影响的影响。本文提出的结果提供了关键的见解，在物理和社会方面，应考虑通过土地利用决策管理地下水位，以避免负面和/或最大限度地提高对农业生产的积极影响。
ABSTRACT In flat plains groundwater affects agricultural production outcomes and risks. Agricultural land use decisions, however, may strongly impact groundwater levels available for production. This paper explores the scope for managing groundwater levels through land use decisions in a sub-basin of the Salado River in the Argentine Pampas, a very flat area that plays a key role in world agricultural production. A spatially distributed hydrological model implemented with MIKE SHE software was used to establish the impacts of different land uses on groundwater dynamics, and to assess the interdependencies among spatially close decision-makers sharing a water table (WT). Additionally, groundwater level changes in response to climate variability were quantified. We found land use has strong effects on WT levels both for oneself (e.g. pastures can lead to significant decreases (up to 4.5 m) in WT levels) and others, in the form of strong interdependencies that exist between farmers sharing a WT where land use decisions of one farmer effect groundwater level of neighbouring farms and vice versa. However, the effectiveness to control groundwater levels through land use decisions is subject to the rather unpredictable effects of rainfall variability. The results presented in this paper provide key insights in relation to physical and social aspects that should be considered for managing groundwater levels through land use decisions, in order to avoid negative and/or maximize positive effects on agricultural production.