期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 109, 期 40, 页码 16213-16216出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1203849109
关键词
deep biosphere; cell enumeration; global microbial biomass; subsurface life
资金
- Forschungsverbund GeoEnergie
- German Federal Ministry of Education and Research
- Ocean Drilling Program
- Biological Oceanography Program of the US National Science Foundation [OCE-0527167, OCE-0752336]
- National Science Foundation [OCE-0527167, OCE-0752336, OCE-0939564]
The global geographic distribution of subseafloor sedimentary microbes and the cause(s) of that distribution are largely unexplored. Here, we show that total microbial cell abundance in subseafloor sediment varies between sites by ca. five orders of magnitude. This variation is strongly correlated with mean sedimentation rate and distance from land. Based on these correlations, we estimate global subseafloor sedimentary microbial abundance to be 2.9 center dot 10(29) cells [corresponding to 4.1 petagram (Pg) C and similar to 0.6% of Earth's total living biomass]. This estimate of subseafloor sedimentary microbial abundance is roughly equal to previous estimates of total microbial abundance in seawater and total microbial abundance in soil. It is much lower than previous estimates of subseafloor sedimentary microbial abundance. In consequence, we estimate Earth's total number of microbes and total living biomass to be, respectively, 50-78% and 10-45% lower than previous estimates.
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