Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai-Tibetan Plateau

doi:10.1002/2017GL075067

GSTDTAP > 气候变化

DOI	10.1002/2017GL075067
	Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai-Tibetan Plateau
	Mu, C. C.1,2; Abbott, B. W.3,4; Wu, X. D.2; Zhao, Q.1; Wang, H. J.1; Su, H.1; Wang, S. F.1; Gao, T. G.1; Guo, H.1; Peng, X. Q.1; Zhang, T. J.1
	2017-09-28
发表期刊	GEOPHYSICAL RESEARCH LETTERS
ISSN	0094-8276
EISSN	1944-8007
出版年	2017
卷号	44 期号:18
文章类型	Article
语种	英语
国家	Peoples R China; USA
英文摘要	The response of dissolved organic carbon (DOC) flux to permafrost degradation is one of the major sources of uncertainty in predicting the permafrost carbon feedback. We investigated DOC export and properties over two complete flow seasons in a catchment on the northern Qinghai-Tibetan Plateau. DOC concentration and biodegradability decreased systematically as thaw depth increased through the season, attributable to changing carbon sources and degree of microbial processing. Increasing DOC aromaticity and C-13-DOC indicated shifts toward more recalcitrant carbon sources and greater residence time in soils prior to reaching the stream network. These strong and consistent seasonal trends suggest that gradual active layer deepening may decrease DOC export and biodegradability from permafrost catchments. Because these patterns are opposite observations from areas experiencing abrupt permafrost collapse (thermokarst), the overall impact of permafrost degradation on DOC flux and biodegradability may depend on the proportion of the landscape experiencing gradual thaw versus thermokarst.
英文关键词	permafrost active layer thaw depth thermokarst seasonality flow path
领域	气候变化
收录类别	SCI-E
WOS记录号	WOS:000413148100034
WOS关键词	HEIHE RIVER-BASIN ; PERMAFROST-CARBON ; SOIL CARBON ; CHEMICAL-COMPOSITION ; CLIMATE-CHANGE ; UPPER REACH ; NITROGEN ; MATTER ; STOCKS ; EXPORT
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
引用统计
文献类型	期刊论文
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/28207
专题	气候变化
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, Northwest Inst Ecoenvironm & Resource, State Key Lab Cryospher Sci, Cryosphere Res Stn Qinghai Tibet Plateau, Lanzhou, Gansu, Peoples R China; 3.Brigham Young Univ, Dept Plant & Wildlife Sci, Provo, UT 84602 USA; 4.Michigan State Univ, Dept Earth & Environm Sci, E Lansing, MI 48824 USA
推荐引用方式 GB/T 7714	Mu, C. C.,Abbott, B. W.,Wu, X. D.,et al. Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai-Tibetan Plateau[J]. GEOPHYSICAL RESEARCH LETTERS,2017,44(18).
APA	Mu, C. C..,Abbott, B. W..,Wu, X. D..,Zhao, Q..,Wang, H. J..,...&Zhang, T. J..(2017).Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai-Tibetan Plateau.GEOPHYSICAL RESEARCH LETTERS,44(18).
MLA	Mu, C. C.,et al."Thaw Depth Determines Dissolved Organic Carbon Concentration and Biodegradability on the Northern Qinghai-Tibetan Plateau".GEOPHYSICAL RESEARCH LETTERS 44.18(2017).