Effects of thermal energy discharge on shallow groundwater ecosystems
Effects of thermal energy discharge on shallow groundwater ecosystems
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DOI：
10.1111/j.1574-6941.2009.00674.x
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发表时间：
2009-06-01
影响因子：
4.2
通讯作者：
Lueders, Tillmann
中科院分区：
文献类型：
--
作者：
Brielmann, Heike;Griebler, Christian;Lueders, Tillmann
利用地下水作为热能的载体是可持续供暖和制冷的重要来源。然而，热利用对地球化学和生物含水层特征的影响知之甚少。在这里，我们通过监测一个活跃的热排放设施中的水文地球化学、细菌和动物参数来评估热排放对未受污染的浅层含水层的影响。观测到的井与井之间的差异很大。然而，没有观察到温度对细菌或动物群的丰度和细菌生产力的显著影响。此外，我们没有观察到随着温度的升高，大肠菌群的存活或生长得到改善。相反，细菌末端限制性片段(T-RF)长度多态指纹的多样性和动物群的多样性分别受到温度的正或负影响，并且所选择的T-RF的丰度明显地依赖于温度。典型对应分析表明，温度和附近河流地表水的影响都是含水层生物变异性的重要驱动因素。这些结果表明，含水层热能排放可以影响含水层细菌和动物，同时只控制总的季节和空间变异性的一小部分，因此不会对未受污染的浅层含水层的生态系统功能和饮用水保护构成可能的威胁。
The use of groundwater as a carrier of thermal energy is an important source of sustainable heating and cooling. However, the effects of thermal use on geochemical and biological aquifer characteristics are poorly understood. Here, we have assessed the impacts of heat discharge on an uncontaminated, shallow aquifer by monitoring the hydrogeochemical, bacterial and faunal parameters at an active thermal discharge facility. The observed variability between wells was considerable. Yet, no significant temperature impacts on bacterial or faunal abundance and on bacterial productivity were observed. Also, we did not observe an improved survival or growth of coliforms with temperature. In contrast, the diversity of bacterial terminal restriction fragment (T-RF) length polymorphism fingerprints and faunal populations was either positively or negatively affected by temperature, respectively, and the abundance of selected T-RFs was clearly temperature dependent. Canonical correspondence analysis indicated that both the impact of temperature and of surface water from a nearby river, were important drivers of aquifer biotic variability. These results demonstrate that aquifer thermal energy discharge can affect aquifer bacteria and fauna, while at the same time controlling only a minor part of the total seasonal and spatial variability and therefore posing no likely threat to ecosystem functioning and drinking water protection in uncontaminated, shallow aquifers.