DOC fluorescence properties and degradation in the Changjiang River Network, China: implications for estimating in-stream DOC removal
文献类型：期刊论文
| 作者 | Lv, Shucong2,3; Wang, Fang2 ; Yan, Weijin2; Wang, Yuchun1,4; Yu, Qibiao2; Li, Yanqiang2
|
| 刊名 | BIOGEOCHEMISTRY
 |
| 出版日期 | 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. |
| WOS关键词 | DISSOLVED ORGANIC-MATTER ; EXCITATION-EMISSION MATRIX ; CARBON-DIOXIDE EMISSIONS ; YANGTZE-RIVER ; BIOAVAILABILITY ; NITROGEN ; REACTIVITY ; QUALITY ; DECOMPOSITION ; WATERSHEDS |
| 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研究方向 | Environmental Sciences & Ecology ; Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000488899700001 |
| 出版者 | SPRINGER |
| 资助机构 | National Key Research and Development Program of China ; National Natural Science Foundation of China |
| 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. |
入库方式： OAI收割
来源：地理科学与资源研究所
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