DOC fluorescence properties and degradation in the Changjiang River Network, China: implications for estimating in-stream DOC removal

doi:10.1007/s10533-019-00603-3

	DOC fluorescence properties and degradation in the Changjiang River Network, China: implications for estimating in-stream DOC removal
	Lv, Shucong 2,3; Wang, Fang 2; Yan, Weijin 2; Wang, Yuchun 1,4; Yu, Qibiao 2; Li, Yanqiang 2
刊名	BIOGEOCHEMISTRY
	2019-09-30
页码	19
关键词	Dissolved organic carbon Fluorescence properties Microbial respiration Photodegradation In-stream removal The Changjiang River Network
ISSN号	0168-2563
DOI	10.1007/s10533-019-00603-3
通讯作者	Yan, Weijin(yanwj@igsnrr.ac.cn)
英文摘要	Dissolved organic carbon (DOC) in large river networks is an important carbon pool in the global biogeochemical cycle. DOC compositions vary spatially at global and regional scales, which influences DOC degradation and subsequent in-stream removal in river networks. The Changjiang River Network (CRN) is the third largest river system worldwide and plays an important role in DOC transformation and transportation. However, the relationships between DOC composition and degradation, as well as the quantification of in-stream removal, remain poorly understood. In this study, we chose the CRN to study spatial patterns of DOC fluorescence, as proxies for chemical composition, and degradation. Laboratory degradation experiments were conducted to explore DOC degradability and mechanisms of photodegradation and microbial respiration. We found that DOC fluorescence properties and degradation showed significant spatial differences in the lower reaches of the CRN. DOC with higher proportions of humic acid-like materials showed higher photodegradability. In degradation experiments, the total DOC loss was 49.1-66.0% over about the first 6 to 7 days. Microbial respiration removed 33.0-47.3% of total DOC, while photodegradation removed 9.0-35.3%. The relative contributions of photodegradation and microbial respiration to DOC degradation varied with different DOC fluorescence properties. The experimental values of DOC decay rate constants were 0.217-0.250 d(-1). Our study improves understanding of DOC degradability, linking to its composition and providing a reference for estimating DOC in-stream removal in large river networks.
资助项目	National Key Research and Development Program of China[2016YFA0601004] ; National Natural Science Foundation of China[91647208] ; National Natural Science Foundation of China[U1802241]
WOS关键词	DISSOLVED ORGANIC-MATTER ; EXCITATION-EMISSION MATRIX ; CARBON-DIOXIDE EMISSIONS ; YANGTZE-RIVER ; BIOAVAILABILITY ; NITROGEN ; REACTIVITY ; QUALITY ; DECOMPOSITION ; WATERSHEDS
WOS研究方向	Environmental Sciences & Ecology ; Geology
语种	英语
出版者	SPRINGER
WOS记录号	WOS:000488899700001
资助机构	National Key Research and Development Program of China ; National Natural Science Foundation of China
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/129599]
专题	中国科学院地理科学与资源研究所
通讯作者	Yan, Weijin
作者单位	1.China Inst Water Resources & Hydropower Res, State Key Lab Simulat & Regulat Water Cycle River, Beijing 10038, Peoples R China 2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, 11A Datun Rd, Beijing 100101, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 4.China Inst Water Resources & Hydropower Res, Dept Water Environm, Beijing 10038, Peoples R China
推荐引用方式 GB/T 7714	Lv, Shucong,Wang, Fang,Yan, Weijin,et al. DOC fluorescence properties and degradation in the Changjiang River Network, China: implications for estimating in-stream DOC removal[J]. BIOGEOCHEMISTRY,2019:19.
APA	Lv, Shucong,Wang, Fang,Yan, Weijin,Wang, Yuchun,Yu, Qibiao,&Li, Yanqiang.(2019).DOC fluorescence properties and degradation in the Changjiang River Network, China: implications for estimating in-stream DOC removal.BIOGEOCHEMISTRY,19.
MLA	Lv, Shucong,et al."DOC fluorescence properties and degradation in the Changjiang River Network, China: implications for estimating in-stream DOC removal".BIOGEOCHEMISTRY (2019):19.