Storage and export of microbial biomass across the western Greenland Ice Sheet.
Storage and export of microbial biomass across the western Greenland Ice Sheet.
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DOI：
10.1038/s41467-021-24040-9
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发表时间：
2021-06-25
影响因子：
16.6
通讯作者：
Hubbard A
中科院分区：
文献类型：
--
作者：
Irvine-Fynn TDL;Edwards A;Stevens IT;Mitchell AC;Bunting P;Box JE;Cameron KA;Cook JM;Naegeli K;Rassner SME;Ryan JC;Stibal M;Williamson CJ;Hubbard A
格陵兰冰盖蕴藏着丰富的微生物生命，但从其表面储存或输出到下游环境的总生物量却不受限制。在这里，我们量化了冰盖西段近地表风化壳透光区内的微生物丰度和细胞生物量通量。使用地下水技术，我们证明间质水流很慢（~10−2 m d−1），而流式细胞仪计数显示该途径将 5 × 108 个细胞 m−2 d−1 输送到冰上溪流，相当于高达 250 g km−2 d−1 的碳通量。我们推断，风化壳中的细胞碳积累超过了河流的输出，促进了生物量固存、碳循环增强和生物反照率降低。我们估计，每年夏天，多达 37kgkm−2 的细胞碳从格陵兰冰盖西部的风化壳环境中冲走，为床层的异养生物和产甲烷作用提供了可观的通量。定植于冰盖表面的微生物对碳循环很重要，但它们的生物量和运输仍然无法量化。在这里，作者揭示了格陵兰冰面的大量微生物碳通量，其数量可能维持冰下异养生物和燃料产甲烷作用。
The Greenland Ice Sheet harbours a wealth of microbial life, yet the total biomass stored or exported from its surface to downstream environments is unconstrained. Here, we quantify microbial abundance and cellular biomass flux within the near-surface weathering crust photic zone of the western sector of the ice sheet. Using groundwater techniques, we demonstrate that interstitial water flow is slow (~10−2 m d−1), while flow cytometry enumeration reveals this pathway delivers 5 × 108 cells m−2 d−1 to supraglacial streams, equivalent to a carbon flux up to 250 g km−2 d−1. We infer that cellular carbon accumulation in the weathering crust exceeds fluvial export, promoting biomass sequestration, enhanced carbon cycling, and biological albedo reduction. We estimate that up to 37 kg km−2 of cellular carbon is flushed from the weathering crust environment of the western Greenland Ice Sheet each summer, providing an appreciable flux to support heterotrophs and methanogenesis at the bed. Microbes that colonise ice sheet surfaces are important to the carbon cycle, but their biomass and transport remains unquantified. Here, the authors reveal substantial microbial carbon fluxes across Greenland’s ice surface, in quantities that may sustain subglacial heterotrophs and fuel methanogenesis.
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影响因子：
5.2
作者：
Cooper, Matthew G.;Smith, Laurence C.;Cooley, SarahW.
通讯作者：
Cooley, SarahW.
影响因子：
5.2
作者：
Christner, Brent C.;Lavender, Heather F.;Stone, William C.
通讯作者：
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影响因子：
11
作者：
Dieser, Markus;Broemsen, Erik L. J. E.;Christner, Brent C.
通讯作者：
Christner, Brent C.
影响因子：
1.7
作者：
Cameron, Karen A.;Hodson, Andrew J.;Osborn, A. Mark
通讯作者：
Osborn, A. Mark
影响因子：
4.2
作者：
Cameron, Karen A.;Stibal, Marek;Jacobsen, Carsten S.
通讯作者：
Jacobsen, Carsten S.