Hydrogeology Group (UPC-CSIC), Department of Geotechnical Engineering and Geo-sciences, Universitat Politècnica de Catalunya-BarcelonaTech, Barcelona, Spain; Institut de Ciència i Tecnologia Ambientals, Universitat Autònoma de Barcelona, Bellaterra, Spain.
Hydrogeology Group (UPC-CSIC), Department of Geotechnical Engineering and Geo-sciences, Universitat Politècnica de Catalunya-BarcelonaTech, Barcelona, Spain.
Sci Total Environ. 2015 Aug 15;524-525:213-24. doi: 10.1016/j.scitotenv.2015.03.123. Epub 2015 Apr 17.
Poplar plantations are used for biomass production in many countries. These plantations are often located in areas where the tree roots can reach the water table of shallow aquifers to reduce irrigation costs and increase evapotranspiration, mainly during the summer. This study aims to assess the effects of these plantations on an aquifer water budget and on the stream flow of a Mediterranean basin (Santa Coloma River, 321.3 km(2) NE Spain). A numerical flow model was constructed to simulate shallow aquifers and to simulate the stream-aquifer interaction for a period of 9 years. Once the model was calibrated, different land use scenarios, such as deciduous forests, dry farming and irrigated farming, were simulated for comparison. The mass balance shows that poplar extracts an average of 2.40 hm(3) from the aquifer, i.e., approximately 18% of the average recharge of the modelled area. This effect reduces the groundwater flow to the main stream and increases the infiltration from the stream to the aquifer. As a result, there is an average reduction in the main stream flow by 46% during the summer, when the lowest flow occurs and when the river is most sensitive. The results indicate that these impacts should be considered in basin management plans and in evaluating the benefits of this type of biomass production.
杨树人工林在许多国家被用于生物质生产。这些人工林通常位于树木根系可以到达浅层含水层地下水位的地区，以降低灌溉成本并增加蒸散量，主要是在夏季。本研究旨在评估这些人工林对含水层水量平衡和地中海流域（西班牙东北部圣科洛马河，321.3km²）河流流量的影响。构建了一个数值流动模型来模拟浅层含水层，并模拟了 9 年的河-含水层相互作用。模型校准后，模拟了不同的土地利用情景，如落叶林、旱作和灌溉农业，以进行比较。质量平衡表明，杨树从含水层中平均抽取 2.40 hm³，即模型区域平均补给量的约 18%。这一效应减少了地下水向主河道的流动，并增加了从河道向含水层的渗透。结果是，在夏季（即流量最低且河流最敏感的时期），主河道流量平均减少了 46%。结果表明，在流域管理计划和评估这种生物质生产的效益时，应考虑这些影响。
