Importance of active layer freeze-thaw cycles on the riverine dissolved carbon export on the Qinghai-Tibet Plateau permafrost region

doi:10.7717/peerj.7146

CORC > 成都山地灾害与环境研究所 > 中国科学院水利部成都山地灾害与环境研究所 > 山地表生过程与生态调控重点实验室

	Importance of active layer freeze-thaw cycles on the riverine dissolved carbon export on the Qinghai-Tibet Plateau permafrost region
	Song, Chunlin1,2 ; Wang, Genxu1 ; Mao, Tianxu3 ; Chen, Xiaopeng 4; Huang, Kewei 1,2; Sun, Xiangyang1 ; Hu, Zhaoyong 1
刊名	PEERJ
	2019-06-17
卷号	7 页码:25
关键词	DIC DOC Riverine carbon Biogeochemistry Qinghai-Tibet Plateau permafrost Active layer
ISSN号	2167-8359
DOI	10.7717/peerj.7146
通讯作者	Wang, Genxu(wanggx@imde.ac.cn)
英文摘要	The Qinghai-Tibet Plateau (QTP) is experiencing severe permafrost degradation, which can affect the hydrological and biogeochemical processes. Yet how the permafrost change affects riverine carbon export remains uncertain. Here, we investigated the seasonal variations of dissolved inorganic and organic carbon (DIC and DOC) during flow seasons in a watershed located in the central QTP permafrost region. The results showed that riverine DIC concentrations (27.81 +/- 9.75 mg L-1) were much higher than DOC concentrations (6.57 +/- 2.24 mg L-1). DIC and DOC fluxes were 3.95 and 0.94 g C m(-2) year(-1), respectively. DIC concentrations increased from initial thaw (May) to freeze period (October), while DOC concentrations remained relatively steady. Daily dissolved carbon concentrations were more closely correlated with baseflow than that with total runoff. Spatially, average DIC and DOC concentrations were positively correlated with vegetation coverage but negatively correlated with bare land coverage. DIC concentrations increased with the thawed and frozen depths due to increased soil interflow, more thaw-released carbon, more groundwater contribution, and possibly more carbonate weathering by soil CO2 formed carbonic acid. The DIC and DOC fluxes increased with thawed depth and decreased with frozen layer thickness. The seasonality of riverine dissolved carbon export was highly dependent on active layer thawing and freezing processes, which highlights the importance of changing permafrost for riverine carbon export. Future warming in the QTP permafrost region may alter the quantity and mechanisms of riverine carbon export.
资助项目	Major Research Plan of the National Natural Science Foundation of China[91547203] ; National Natural Science Foundation of China[41890821] ; National Natural Science Foundation of China[41701037] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20050102] ; China Scholarship Council
WOS关键词	SOIL ORGANIC-CARBON ; CLIMATE-CHANGE ; SEASONAL VARIABILITY ; FLUXES ; TRANSPORT ; CATCHMENT ; NITROGEN ; WATER ; BIODEGRADABILITY ; BIOAVAILABILITY
WOS研究方向	Science & Technology - Other Topics
语种	英语
出版者	PEERJ INC
WOS记录号	WOS:000471756800016
资助机构	Major Research Plan of the National Natural Science Foundation of China ; National Natural Science Foundation of China ; Strategic Priority Research Program of Chinese Academy of Sciences ; China Scholarship Council
内容类型	期刊论文
源URL	[http://ir.imde.ac.cn/handle/131551/26502]
专题	成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
通讯作者	Wang, Genxu
作者单位	1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu, Sichuan, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Guizhou Univ, Guiyang, Guizhou, Peoples R China 4.Shanxi Agr Univ, Jinzhong, Peoples R China
推荐引用方式 GB/T 7714	Song, Chunlin,Wang, Genxu,Mao, Tianxu,et al. Importance of active layer freeze-thaw cycles on the riverine dissolved carbon export on the Qinghai-Tibet Plateau permafrost region[J]. PEERJ,2019,7:25.
APA	Song, Chunlin.,Wang, Genxu.,Mao, Tianxu.,Chen, Xiaopeng.,Huang, Kewei.,...&Hu, Zhaoyong.(2019).Importance of active layer freeze-thaw cycles on the riverine dissolved carbon export on the Qinghai-Tibet Plateau permafrost region.PEERJ,7,25.
MLA	Song, Chunlin,et al."Importance of active layer freeze-thaw cycles on the riverine dissolved carbon export on the Qinghai-Tibet Plateau permafrost region".PEERJ 7(2019):25.