Carbon recycling efficiency and phosphate turnover by marine nitrifying archaea
Carbon recycling efficiency and phosphate turnover by marine nitrifying archaea
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DOI：
10.1126/sciadv.aba1799
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发表时间：
2020-05
期刊：
影响因子：
13.6
通讯作者：
T. Meador;N. Schoffelen;T. Ferdelman;Osmond Rebello;A. Khachikyan;M. Könneke
中科院分区：
文献类型：
--
作者：
T. Meador;N. Schoffelen;T. Ferdelman;Osmond Rebello;A. Khachikyan;M. Könneke
高效的thaumarchaeal化能自养生物回收约5%的再矿化C和P，并将溶解的有机物释放到海洋中。Thaumarchaeotal硝化菌是海洋中最丰富的生物之一，但仍然未知的是硝化作用产生的碳（C）以及这些通量与磷（P）周转和细胞代谢产物释放的耦合。利用双放射性示踪方法，我们发现，Nitrosopumilus maritimus固定约0.3摩尔C，同化2 mmol P，并释放约0.5 mmol C。10−2 mol C和10−5 mol P作为溶解有机物（DOC和DOP）每摩尔氨呼吸。磷酸盐周转可能会影响同化通量的硝化细菌在真光层，这平行的暗海洋。总的来说，海洋硝化细菌每年吸收高达2 Pg C和0.05 Pg P，从而将大约5%的矿化C和P再循环到海洋生物质中。Thaumarchaea每年释放约50 Tg DOC和0.2 Tg DOP，代表整个海洋中少量但新鲜的减少基质输入。
Efficient thaumarchaeal chemoautotrophs recycle ~5% of remineralized C and P and release dissolved organics to the ocean. Thaumarchaeotal nitrifiers are among the most abundant organisms in the ocean, but still unknown is the carbon (C) yield from nitrification and the coupling of these fluxes to phosphorus (P) turnover and release of metabolites from the cell. Using a dual radiotracer approach, we found that Nitrosopumilus maritimus fixed roughly 0.3 mol C, assimilated 2 mmol P, and released ca. 10−2 mol C and 10−5 mol P as dissolved organics (DOC and DOP) per mole ammonia respired. Phosphate turnover may influence assimilation fluxes by nitrifiers in the euphotic zone, which parallel those of the dark ocean. Collectively, marine nitrifiers assimilate up to 2 Pg C year−1 and 0.05 Pg P year−1 and thereby recycle roughly 5% of mineralized C and P into marine biomass. Release of roughly 50 Tg DOC and 0.2 Tg DOP by thaumarchaea each year represents a small but fresh input of reduced substrates throughout the ocean.