Surface exposure to sunlight stimulates CO_2 release from permafrost soil carbon in the Arctic

Cory R.M.; Crump B.C.; Dobkowski J.A.Kling G.W.

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Surface exposure to sunlight stimulates CO_2 release from permafrost soil carbon in the Arctic

机译：Surface exposure to sunlight stimulates CO_2 release from permafrost soil carbon in the Arctic

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Recent climate change has increased arctic soil temperatures and thawed large areas of permafrost, allowing for microbial respiration of previously frozen C. Furthermore, soil destabilization from melting ice has caused an increase in thermokarst failures that expose buried C and release dissolved organic C (DOC) to surface waters. Once exposed, the fate of this C is unknown but will depend on its reactivity to sunlight and microbial attack, and the light available at the surface. In this study we manipulated water released from areas of thermokarst activity to show that newly exposed DOC is >40 more susceptible to microbial conversion to CO_2 when exposed to UV light than when kept dark. When integrated over the water column of receiving rivers, this susceptibility translates to the light-stimulated bacterial activity being on average from 11 to 40 of the total areal activity in turbid versus DOC-colored rivers, respectively. The range of DOC lability to microbes seems to depend on prior light exposure, implying that sunlight may act as an amplification factor in the conversion of frozen C stores to C gases in the atmosphere.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2013年第9期|3429-3434|共6页
作者
Cory R.M.; Crump B.C.; Dobkowski J.A.Kling G.W.;
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作者单位

Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, NC, 27599, United States;

Horn Point Laboratory, University of Maryland, Cambridge, MD, 21613, United States;

Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI, 48109, United States;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
Bacterial community composition; Carbon cycling; Dissolved organic matter; Photochemistry; Stream;

Surface exposure to sunlight stimulates CO_2 release from permafrost soil carbon in the Arctic

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