Global distribution of microbial abundance and biomass in subseafloor sediment

被引：627

作者：

Kallmeyer, Jens ^{[1
,2
]}

Pockalny, Robert ^{[3
]}

Adhikari, Rishi Ram ^{[1
]}

Smith, David C. ^{[3
]}

D'Hondt, Steven ^{[3
]}

机构：

[1] Univ Potsdam, Inst Erd & Umweltwissensch, D-14476 Potsdam, Germany

[2] GFZ German Res Ctr Geosci, Helmholtz Ctr Potsdam, D-14473 Potsdam, Germany

[3] Univ Rhode Isl, Grad Sch Oceanog, Narragansett, RI 02882 USA

来源：

PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA | 2012年 / 109卷 / 40期

基金：

美国国家科学基金会;

关键词：

deep biosphere; cell enumeration; global microbial biomass; subsurface life; ORGANIC-MATTER; DEEP; RESPIRATION; PROKARYOTES; BIOSPHERE; MODEL; LIFE;

D O I：

10.1073/pnas.1203849109

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

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.

引用

页码：16213 / 16216

页数：4

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