Liang Zuobing, Li Shaoheng, Wang Zhuowei, Li Rui, Yang Zhigang, Chen Jianyao, Gao Lei, Sun Yuchuan
School of Geography and Planning, Sun Yat-sen University, Guangzhou, China.
Key Laboratory of Groundwater Sciences and Engineering, Ministry of Natural Resources, Shijiazhuang, China.
Front Microbiol. 2023 Jan 17;13:1054295. doi: 10.3389/fmicb.2022.1054295. eCollection 2022.
Little is known about how microbial activity affects the hydraulic properties of karst aquifers. To explore the potential impacts of microbial activity on the hydraulic properties of karst aquifers, microbiological analysis, heat tracer, isotope (dissolved inorganic carbon isotope, δC) and aqueous geochemical analyses were conducted at six monitoring wells in Northern Guangdong Province, China. Greater hydraulic conductivity corresponded to a low temperature gradient to an extent; the temperature gradient in karst groundwater aquifers can reflect the degree of dissolution. Higher HCO concentrations coupled with lower d-excess and pH values at B2 and B6 reflect potential microbial activity (e.g., ) causing carbonate dissolution. Microbial activity or the input of anthropogenic acids, as evidenced by significantly more positive δC values, potentially affect carbonate dissolution in deep karst aquifers, which eventually alters hydraulic properties of karst aquifer. However, more direct evidence is needed to quantify the effects of microbial activity on carbonate dissolution in karst aquifers.
关于微生物活动如何影响岩溶泉含水层的水力特性，目前所知甚少。为了探究微生物活动对岩溶泉含水层水力特性的潜在影响，在中国广东省北部的六个监测井进行了微生物分析、热示踪、同位素（溶解无机碳同位素，δC）和水地球化学分析。在一定程度上，更大的水力传导率对应着较低的温度梯度；岩溶泉地下含水层中的温度梯度可以反映溶解程度。B2和B6处较高的HCO浓度以及较低的d值过剩和pH值反映了潜在的微生物活动（例如）导致碳酸盐溶解。微生物活动或人为酸的输入，如δC值明显更正向所证明的，可能会影响深部岩溶泉含水层中的碳酸盐溶解，最终改变岩溶泉含水层的水力特性。然而，需要更直接的证据来量化微生物活动对岩溶泉含水层中碳酸盐溶解的影响。
