Rock-crushing derived hydrogen directly supports a methanogenic community: significance for the deep biosphere.
Rock-crushing derived hydrogen directly supports a methanogenic community: significance for the deep biosphere.
复制标题
岩石破碎产生的氢直接支持产甲烷群落：对深层生物圈的意义。
DOI：
10.1111/1758-2229.12723
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发表时间：
2019
影响因子：
3.3
通讯作者：
Parkes RJ
中科院分区：
文献类型：
--
作者：
Parkes RJ
微生物种群存在于地球很深的地方，但显然能源供应不足。地震岩石破裂通过机械力化学分解水产生氢气，然而，微生物对这一广泛存在的潜在能源的利用尚未得到直接证明。在这里，我们通过实验证明，从花岗岩中机械力化学产生的氢可以直接、长期地被产生甲烷的微生物群落利用。这与地下岩石破裂环境中的CH4地层相一致。我们的结果不仅支持水裂解H_2的产生作为一种潜在的深层生物圈能源，而且作为一种氧化剂也必须产生，这表明在次表层也有一种独立于光合作用的呼吸氧化剂供应。这可能解释了地下环境中兼性好氧菌的广泛分布。一系列常见的岩石被证明可以产生机械化学氢，因此，这一过程应该在地下广泛存在，有可能有相当大的矿物燃料产生甲烷。
Microbial populations exist to great depths on Earth, but with apparently insufficient energy supply. Earthquake rock fracturing produces H2from mechanochemical water splitting, however, microbial utilization of this widespread potential energy source has not been directly demonstrated. Here, we show experimentally that mechanochemically generated H2from granite can be directly, long‐term, utilized by a CH4producing microbial community. This is consistent with CH4formation in subsurface rock fracturing in the environment. Our results not only support water splitting H2generation as a potential deep biosphere energy source, but as an oxidant must also be produced, they suggest that there is also a respiratory oxidant supply in the subsurface which is independent of photosynthesis. This may explain the widespread distribution of facultative aerobes in subsurface environments. A range of common rocks were shown to produce mechanochemical H2, and hence, this process should be widespread in the subsurface, with the potential for considerable mineral fuelled CH4production.