Distributions of microbial activities in deep subseafloor sediments
Distributions of microbial activities in deep subseafloor sediments
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DOI：
10.1126/science.1101155
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发表时间：
2004-12-24
期刊：
影响因子：
56.9
通讯作者：
Acosta, JLS
中科院分区：
文献类型：
--
作者：
D'Hondt, S;Jorgensen, BB;Acosta, JLS
东太平洋深埋的沉积物中存在着各种各样的微生物群落和许多产生能量的活动。代谢活动的分布经常偏离标准模型。从一个海底环境到另一个海底环境，培养细菌的活动率、细胞密度和种群都有一致的变化。主要活动的净率主要取决于光合作用表面世界的电子受体和电子供体。在开阔海域，硝酸盐和氧气通过下面的玄武岩含水层供应给最深的沉积群落。反过来，这些沉积群落可能为底层地壳生物圈提供溶解的电子供体和营养物质。
Diverse microbial communities and numerous energy-yielding activities occur in deeply buried sediments of the eastern Pacific Ocean. Distributions of metabolic activities often deviate from the standard model. Rates of activities, cell concentrations, and populations of cultured bacteria vary consistently from one subseafloor environment to another. Net rates of major activities principally rely on electron acceptors and electron donors from the photosynthetic surface world. At open-ocean sites, nitrate and oxygen are supplied to the deepest sedimentary communities through the underlying basaltic aquifer. In turn, these sedimentary communities may supply dissolved electron donors and nutrients to the underlying crustal biosphere.