气候变化领域集成服务门户(CCPortal): Permafrost carbon-climate feedback is sensitive to deep soil carbon decomposability but not deep soil nitrogen dynamics

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DOI	10.1073/pnas.1415123112
	Permafrost carbon-climate feedback is sensitive to deep soil carbon decomposability but not deep soil nitrogen dynamics
	Koven C.D.; Lawrence D.M.; Riley W.J.
发表日期	2015
ISSN	0027-8424
起始页码	3752
结束页码	3757
卷号	112 期号:12
英文摘要	Permafrost soils contain enormous amounts of organic carbon whose stability is contingent on remaining frozen. With future warming, these soils may release carbon to the atmosphere and act as a positive feedback to climate change. Significant uncertainty remains on the postthaw carbon dynamics of permafrost-affected ecosystems, in particular since most of the carbon resides at depth where decomposition dynamics may differ from surface soils, and since nitrogen mineralized by decomposition may enhance plant growth. Here we show, using a carbon-nitrogen model that includes permafrost processes forced in an unmitigated warming scenario, that the future carbon balance of the permafrost region is highly sensitive to the decomposability of deeper carbon, with the net balance ranging from 21 Pg C to 164 Pg C losses by 2300. Increased soil nitrogen mineralization reduces nutrient limitations, but the impact of deep nitrogen on the carbon budget is small due to enhanced nitrogen availability from warming surface soils and seasonal asynchrony between deeper nitrogen availability and plant nitrogen demands. Although nitrogen dynamics are highly uncertain, the future carbon balance of this region is projected to hinge more on the rate and extent of permafrost thaw and soil decomposition than on enhanced nitrogen availability for vegetation growth resulting from permafrost thaw.
英文关键词	Carbon cycle; Cryosphere; Earth system models; Permafrost thaw; Soil organic matter
语种	英语
scopus关键词	carbon; nitrogen; Article; atmosphere; carbon balance; carbon dynamics; climate; climate change; decomposition; ecosystem; greenhouse effect; greenhouse gas; microbial community; nitrogen availability; nitrogen dynamics; nitrogen mineralization; nonhuman; nutrient limitation; permafrost; priority journal; productivity; soil chemistry; soil fertilization; surface soil; vegetation
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/158912
作者单位	Koven, C.D., Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States; Lawrence, D.M., Climate and Global Dynamics Division, National Center for Atmospheric Research, Boulder, CO 80305, United States; Riley, W.J., Earth Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, United States
推荐引用方式 GB/T 7714	Koven C.D.,Lawrence D.M.,Riley W.J.. Permafrost carbon-climate feedback is sensitive to deep soil carbon decomposability but not deep soil nitrogen dynamics[J],2015,112(12).
APA	Koven C.D.,Lawrence D.M.,&Riley W.J..(2015).Permafrost carbon-climate feedback is sensitive to deep soil carbon decomposability but not deep soil nitrogen dynamics.Proceedings of the National Academy of Sciences of the United States of America,112(12).
MLA	Koven C.D.,et al."Permafrost carbon-climate feedback is sensitive to deep soil carbon decomposability but not deep soil nitrogen dynamics".Proceedings of the National Academy of Sciences of the United States of America 112.12(2015).