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Dissolved organic carbon content and characteristics in relation to carbon dioxide partial pressure across Poyang Lake wetlands and adjacent aquatic systems in the Changjiang basin
Wang, Huaxin1,4; Jiao, Ruyuan2; Wang, Fang1; Zhang, Lu3; Yan, Weijin1
2016-12-01
Source PublicationENVIRONMENTAL POLLUTION
ISSN0269-7491
Volume219Pages:714-723
Corresponding AuthorYan, Weijin(yanwj@igsnrr.ac.cn)
AbstractDissolved organic carbon (DOC) plays diverse roles in carbon biogeochemical cycles. Here, we explored the link between DOC and pCO(2) using high-performance size-exclusion chromatography (HPSEC) with UV254 detection and excitation emission matrix (EEM) fluorescence spectroscopy to determine the molecular weight distribution (MW) and the spectral characteristics of DOC, respectively. The relationship between DOC and pCO(2) was investigated in the Poyang Lake wetlands and their adjacent aquatic systems. The results indicated significant spatial variation in the DOC concentrations, MW distributions, and pCO(2). The DOC concentration was higher in the wetlands than in the rivers and lakes. pCO(2) was high in wetlands in which the dominant vegetation was Phragmites australis, whereas it was low in wetlands in which Carex tristachya was the dominant species. DOC was divided into five fractions according to MW, as follows: super-low MW (SLMW, <1 kDa); low MW (LMW, 1-2.5 kDa); intermediate MW (IMW, 2.5 3.5 kDa); high MW (HMW, 3.5-6 kDa); and super-high MW (SMW, > 40 kDa). Rivers contained high proportions of HMW and extremely low amounts of SLMW, whereas wetlands had relatively high proportions of SLMW. The proportion of SMW (SMWp) was particularly high in wetlands. We found that pCO(2) significantly positively correlated with the proportion of IMW, and significantly negatively correlated with SMWp. These data improve our understanding of the MW of bioavailable DOC and its conversion to CO2. The present results demonstrate that both the content and characteristics of DOC significantly affect pCO(2). pCO(2) and DOC must be studied further to help understanding the role of the wetland on the regional CO2 budget. (C) 2016 Elsevier Ltd. All rights reserved.
KeywordDissolved organic carbon Carbon dioxide partial pressure Molecular weight Poyang Lake wetland High-performance size-exclusion chromatography
DOI10.1016/j.envpol.2016.07.012
WOS KeywordSIZE-EXCLUSION CHROMATOGRAPHY ; FRESH-WATER ; MOLECULAR-WEIGHT ; ESTUARINE WATERS ; MATTER ; RIVER ; CHINA ; DENITRIFICATION ; EMISSION ; BIOAVAILABILITY
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[21177126] ; National Natural Science Foundation of China[41371454] ; National Key Research and Development Program of China[2016YFA0601000] ; CAS Key Project[KJZD-EW-TZ-G10]
Funding OrganizationNational Natural Science Foundation of China ; National Key Research and Development Program of China ; CAS Key Project
WOS Research AreaEnvironmental Sciences & Ecology
WOS SubjectEnvironmental Sciences
WOS IDWOS:000390734100080
PublisherELSEVIER SCI LTD
Citation statistics
Document Type期刊论文
Identifierhttp://ir.igsnrr.ac.cn/handle/311030/65393
Collection中国科学院地理科学与资源研究所
Corresponding AuthorYan, Weijin
Affiliation1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, Beijing 100087, Peoples R China
3.Chinese Acad Sci, Nanjing Inst Geog & Limnol, Key Lab Lake & Environm, Nanjing 210008, Jiangsu, Peoples R China
4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Wang, Huaxin,Jiao, Ruyuan,Wang, Fang,et al. Dissolved organic carbon content and characteristics in relation to carbon dioxide partial pressure across Poyang Lake wetlands and adjacent aquatic systems in the Changjiang basin[J]. ENVIRONMENTAL POLLUTION,2016,219:714-723.
APA Wang, Huaxin,Jiao, Ruyuan,Wang, Fang,Zhang, Lu,&Yan, Weijin.(2016).Dissolved organic carbon content and characteristics in relation to carbon dioxide partial pressure across Poyang Lake wetlands and adjacent aquatic systems in the Changjiang basin.ENVIRONMENTAL POLLUTION,219,714-723.
MLA Wang, Huaxin,et al."Dissolved organic carbon content and characteristics in relation to carbon dioxide partial pressure across Poyang Lake wetlands and adjacent aquatic systems in the Changjiang basin".ENVIRONMENTAL POLLUTION 219(2016):714-723.
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