Global distribution of microbial abundance and biomass in subseafloor sediment
Global distribution of microbial abundance and biomass in subseafloor sediment
复制标题
DOI：
10.1073/pnas.1203849109
复制
发表时间：
2012-10-02
影响因子：
11.1
通讯作者：
D'Hondt, Steven
中科院分区：
文献类型：
--
作者：
Kallmeyer, Jens;Pockalny, Robert;D'Hondt, Steven
海底沉积微生物的全球地理分布及其分布的原因在很大程度上尚未探索。在这里，我们表明，总的微生物细胞丰度在海底沉积物不同的网站之间的CA。五个数量级。这种变化与平均沉积速率和离陆地的距离密切相关。根据这些相关性，我们估计全球海底下沉积微生物丰度为2.9中心点10（29）细胞[相当于4.1千万亿吨（Pg）C，相当于地球总生物量的0.6%]。对海底以下沉积微生物丰度的这一估计大致等于以前对海水中微生物总丰度和土壤中微生物总丰度的估计。这比以前对海底以下沉积微生物丰度的估计要低得多。因此，我们估计地球的微生物总数和总生物量分别比以前的估计低50-78%和10-45%。
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.