Ultraviolet radiation rather than inorganic nitrogen increases dissolved organic carbon biodegradability in a typical thermo-erosion gully on the Tibetan Plateau

doi:10.1016/j.scitotenv.2018.01.275

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	Ultraviolet radiation rather than inorganic nitrogen increases dissolved organic carbon biodegradability in a typical thermo-erosion gully on the Tibetan Plateau
	Liu, Futing 1; Chen, Leiyi ; Zhang, Beibei ; Wang, Guanqin 1; Qin, Shuqi 1; Yang, Yuanhe 1
刊名	SCIENCE OF THE TOTAL ENVIRONMENT
	2018
卷号	627 页码:1276-1284
关键词	Alpine permafrost Carbon cycle Dissolved organic carbon Thermokarst Inorganic nitrogen Ultraviolet radiation
ISSN号	0048-9697
DOI	10.1016/j.scitotenv.2018.01.275
文献子类	Article
英文摘要	Permafrost thaw could lead to frozen carbon (C) being laterally transferred to aquatic systems as dissolved organic carbon (DOC). If this part of DOC has high biodegradability, it could be decomposed during the delivery process, release greenhouse gases to the atmosphere and trigger positive C-climate feedback. Thermokarst is an abrupt permafrost thaw process that can enhance DOC export and also impact DOC processing through increased inorganic nitrogen (N) and ultraviolet (UV) light exposure. Especially on the Tibetan Plateau, where thermokarst develops widely and suffers from serious UV radiation and N limitation. However, it remains unclear how thermokarst-impacted biodegradable DOC (BDOC) responds to inorganic N addition and UV radiation. Here, we explored the responses of DOC concentration, composition and its biodegradability to inorganic N and UV amendments in a typical thermokarst on the Tibetan Plateau, by using laboratory incubations with spectral analyses (UV-visible absorption and three-dimensional fluorescence spectra) and parallel factor analyses. Our results showed that BDOC in thermokarst outflows was significantly higher than in reference water. Our results also revealed that inorganic N addition had no influence on thermokarst-impacted BDOC, whereas exposure to UV light significantly increased BDOC by as much as 2.3 times higher than the dark-control. Moreover, N addition and UV radiation did not generate additive effects on BDOC. Our results further illustrated that dissolved organic matter (DOM) composition explained more of the variability in BDOC, while the nutrients and other physicochemical properties played a minor role. Overall, these results imply that UV light rather than inorganic N significantly increases thermokarst-derived BDOC, potentially strengthening the positive permafrost C-climate feedback. (c) 2018 Published by Elsevier B.V.
学科主题	Environmental Sciences
电子版国际标准刊号	1879-1026
出版地	AMSTERDAM
WOS关键词	PERMAFROST-CARBON ; CHEMICAL-COMPOSITION ; MATTER FLUORESCENCE ; MOLECULAR-WEIGHT ; RATIOS ; CO2
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000431848500120
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31670482] ; Key Research Program of Frontier Sciences, Chinese Academy of Sciences [QYZDB-SSW-SMC049] ; Chinese Academy of Sciences-Peking University Pioneer Cooperation Team
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/20692]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
推荐引用方式 GB/T 7714	Liu, Futing,Chen, Leiyi,Zhang, Beibei,et al. Ultraviolet radiation rather than inorganic nitrogen increases dissolved organic carbon biodegradability in a typical thermo-erosion gully on the Tibetan Plateau[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2018,627:1276-1284.
APA	Liu, Futing,Chen, Leiyi,Zhang, Beibei,Wang, Guanqin,Qin, Shuqi,&Yang, Yuanhe.(2018).Ultraviolet radiation rather than inorganic nitrogen increases dissolved organic carbon biodegradability in a typical thermo-erosion gully on the Tibetan Plateau.SCIENCE OF THE TOTAL ENVIRONMENT,627,1276-1284.
MLA	Liu, Futing,et al."Ultraviolet radiation rather than inorganic nitrogen increases dissolved organic carbon biodegradability in a typical thermo-erosion gully on the Tibetan Plateau".SCIENCE OF THE TOTAL ENVIRONMENT 627(2018):1276-1284.