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	Permafrost collapse shifts alpine tundra to a carbon source but reduces N2O and CH4 release on the northern Qinghai-Tibetan Plateau
	Mu, C. C.1,2; Abbott, B. W.3,4; Zhao, Q.1; Su, H.1; Wang, S. F.1; Wu, Q. B.5; Zhang, T. J.1; Wu, X. D.2
刊名	GEOPHYSICAL RESEARCH LETTERS
	2017-09-16
卷号	44期号:17页码:8945-8952
ISSN号	0094-8276
DOI	10.1002/2017GL074338
通讯作者	Zhang, T. J.(tjzhang@lzu.edu.cn) ; Wu, X. D.(wxd565@163.com)
英文摘要	Important unknowns remain about how abrupt permafrost collapse (thermokarst) affects carbon balance and greenhouse gas flux, limiting our ability to predict the magnitude and timing of the permafrost carbon feedback. We measured monthly, growing-season fluxes of CO2, CH4, and N2O at a large thermokarst feature in alpine tundra on the northern Qinghai-Tibetan Plateau (QTP). Thermokarst formation disrupted plant growth and soil hydrology, shifting the ecosystem from a growing-season carbon sink to a weak source but decreasing feature level CH4 and N2O flux. Temperature-corrected ecosystem respiration from decomposing permafrost soil was 2.7 to 9.5-fold higher than in similar features from Arctic and Boreal regions, suggesting that warmer and dryer conditions on the northern QTP could accelerate carbon decomposition following permafrost collapse. N2O flux was similar to the highest values reported for Arctic ecosystems and was 60% higher from exposed mineral soil on the feature floor, confirming Arctic observations of coupled nitrification and denitrification in collapsed soils. Q(10) values for respiration were typically over 4, suggesting high-temperature sensitivity of thawed carbon. Taken together, these results suggest that QTP permafrost carbon in alpine tundra is highly vulnerable to mineralization following thaw, and that N2O production could be an important noncarbon permafrost climate feedback. Permafrost collapse altered soil hydrology, shifting the ecosystem from a carbon sink to carbon source but decreasing CH4 and N2O flux. Little to no vegetation recovery after stabilization suggests potentially large net carbon losses. High N2O flux compared to Arctic and Boreal systems suggests noncarbon permafrost climate feedback.
收录类别	SCI
WOS关键词	SOIL RESPIRATION ; ORGANIC-MATTER ; CLIMATE-CHANGE ; PEAT SOIL ; GRASSLAND ; STOCKS ; VULNERABILITY ; TEMPERATURE ; EMISSIONS ; REGIONS
WOS研究方向	Geology
WOS类目	Geosciences, Multidisciplinary
语种	英语
出版者	AMER GEOPHYSICAL UNION
WOS记录号	WOS:000411702400032
内容类型	期刊论文
URI标识	http://www.corc.org.cn/handle/1471x/2557684
专题	寒区旱区环境与工程研究所
通讯作者	Zhang, T. J.; Wu, X. D.
作者单位	1.Lanzhou Univ, Coll Earth & Environm Sci, Key Lab Western Chinas Environm Syst, Lanzhou, Gansu, Peoples R China 2.Chinese Acad Sci, State Key Lab Cryosphere Sci, Northwest Inst Ecoenvironm & Resource, Cryosphere Res Stn Qinghai Tibet Plateau, Lanzhou, Gansu, Peoples R China 3.Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA 4.Brigham Young Univ, Dept Plant & Wildlife Sci, Provo, UT 84602 USA 5.Chinese Acad Sci, State Key Lab Frozen Soil Engn, Northwest Inst Ecoenvironm & Resource, Lanzhou, Gansu, Peoples R China
推荐引用方式 GB/T 7714	Mu, C. C.,Abbott, B. W.,Zhao, Q.,et al. Permafrost collapse shifts alpine tundra to a carbon source but reduces N2O and CH4 release on the northern Qinghai-Tibetan Plateau[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(17):8945-8952.
APA	Mu, C. C..,Abbott, B. W..,Zhao, Q..,Su, H..,Wang, S. F..,...&Wu, X. D..(2017).Permafrost collapse shifts alpine tundra to a carbon source but reduces N2O and CH4 release on the northern Qinghai-Tibetan Plateau.GEOPHYSICAL RESEARCH LETTERS,44(17),8945-8952.
MLA	Mu, C. C.,et al."Permafrost collapse shifts alpine tundra to a carbon source but reduces N2O and CH4 release on the northern Qinghai-Tibetan Plateau".GEOPHYSICAL RESEARCH LETTERS 44.17(2017):8945-8952.

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