Portillo M C, Porca E, Cuezva S, Cañaveras J C, Sanchez-Moral S, Gonzalez J M
Instituto de Recursos Naturales y Agrobiología, IRNAS-CSIC, Avda. Reina Mercedes 10, Sevilla 41012, Spain.
Naturwissenschaften. 2009 Sep;96(9):1035-42. doi: 10.1007/s00114-009-0562-5. Epub 2009 Jun 2.
Bacteria thriving in underground systems, such as karsts, adapt to use a variety of nutrients. Most of these nutrients derive from superficial processes. This study shows that bacteria are able to differentially induce carbonate precipitation or dissolution depending on the availability of nutrients for growth. Different bacterial strains isolated from caves, representing the most common components of these microbial communities, were cultured with different carbon and nitrogen sources (e.g., acetate, glucose, peptone, humic acids) and induced changes in pH were measured during growth. Carbonate can either precipitate or dissolve during bacterial growth. The induction of carbonate precipitates or their dissolution as a function of consumption of specific carbon sources revealed the existence of an active nutrient cycling process in karsts and links nutrients and environmental conditions to the existence of a highly significant carbon sink in subterraneous environments.
在地下系统（如喀斯特地貌）中繁衍生息的细菌会适应利用多种养分。这些养分大多源自地表过程。本研究表明，细菌能够根据生长所需养分的可利用性，差异性地诱导碳酸盐沉淀或溶解。从洞穴中分离出的不同细菌菌株代表了这些微生物群落中最常见的成分，它们在不同的碳源和氮源（如乙酸盐、葡萄糖、蛋白胨、腐殖酸）中培养，并在生长过程中测量诱导产生的pH变化。在细菌生长过程中，碳酸盐既可以沉淀也可以溶解。作为特定碳源消耗函数的碳酸盐沉淀或溶解的诱导揭示了喀斯特地貌中存在活跃的养分循环过程，并将养分和环境条件与地下环境中高度显著的碳汇的存在联系起来。
