Weighing the deep continental biosphere
Weighing the deep continental biosphere
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DOI：
10.1111/1574-6941.12196
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发表时间：
2014-01-01
影响因子：
4.2
通讯作者：
Parnell, John
中科院分区：
文献类型：
--
作者：
McMahon, Sean;Parnell, John
大量证据表明，在大陆深部裂缝和含水层中广泛存在微生物活动，这对地球上的生物地球化学循环和其他行星体的可居住性具有重要意义。惠特曼等等。（P Natl Acad Sci USA, 95, 1998, 6578）估计大陆地下生物量约为10(16)-10(17)g c。我们根据最近的数据重新评估了这一值，包括100多个来自世界各地地下水的微生物种群密度测量。对细胞碳含量和附着微生物和自由微生物的比例进行保守假设，我们发现证据继续支持深层大陆生物量估计为10(16)-10(17)g C，或地球总生物量的2-19%。
There is abundant evidence for widespread microbial activity in deep continental fractures and aquifers, with important implications for biogeochemical cycling on Earth and the habitability of other planetary bodies. Whitman etal. (P Natl Acad Sci USA, 95, 1998, 6578) estimated a continental subsurface biomass on the order of 10(16)-10(17)g C. We reassess this value in the light of more recent data including over 100 microbial population density measurements from groundwater around the world. Making conservative assumptions about cell carbon content and the ratio of attached and free-living microorganisms, we find that the evidence continues to support a deep continental biomass estimate of 10(16)-10(17)g C, or 2-19% of Earth's total biomass.