Biodegradability of riverine dissolved organic carbon in a Dry-hot Valley Region: Initial trophic controls and variations in chemical composition
文献类型：期刊论文
| 作者 | Ni, Maofei1,2; Li, Siyue2
|
| 刊名 | JOURNAL OF HYDROLOGY
 |
| 出版日期 | 2019-07-01 |
| 卷号 | 574页码:430-435 |
| 关键词 | Biodegradability Dissolved organic matter Temperature sensitivity Trophic status Riverine carbon cycle Incubation |
| ISSN号 | 0022-1694 |
| DOI | 10.1016/j.jhydrol.2019.04.069 |
| 通讯作者 | Li, Siyue(syli2006@163.com) |
| 英文摘要 | Aquatic carbon (C) loss is mostly driven by in-situ mineralization of dissolved organic carbon (DOC) and leads to autonomous carbon dioxide (CO2) emissions to the atmosphere. However, limited studies have examined the biodegradability of riverine DOC, especially for the initial trophic controls of DOC biodegradation (%BDOC) and variations in dissolved organic matter (DOM) chemical composition. In this study, we employed a laboratory incubation experiment to determine the riverine %BDOC, temperature sensitivity (Q(10) value), nutrients and DOM optical properties in a subtropical river in the Dry-hot Valley Region. We observed the %BDOC at 30 degrees C (52 +/- 19.8%) was significantly higher than that at 20 degrees C (34 19.9%) with an average Qio value of 2 +/- 1.7. Decreases in a(254), a(350) values indicated that the aromatic and lignin fractions were decomposed, while increases in E2:E3 and decreases in E4:46 values suggested that large molecular DOMs were incompletely degraded and accumulated after 56-day incubations. The %BDOC was negatively correlated with the DOC:TDP ratio, which suggested that P availability was a dominant control in aquatic microbial respiration. Our results conclude that temperature and trophic status regulate biodegradability of DOC, and also stimulate the incomplete degradation of recalcitrant fraction in DOMs. |
| 资助项目 | National Natural Science Foundation of China (NSFC)[31670473] ; Hundred-Talent Program of the Chinese Academy of Sciences |
| WOS研究方向 | Engineering ; Geology ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000476962800035 |
| 出版者 | ELSEVIER |
| 源URL | [http://119.78.100.138/handle/2HOD01W0/8329]  |
| 专题 | 生态水文研究中心 |
| 通讯作者 | Li, Siyue |
| 作者单位 | 1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 2.Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Res Ctr Ecohydrol, Chongqing 400714, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ni, Maofei,Li, Siyue. Biodegradability of riverine dissolved organic carbon in a Dry-hot Valley Region: Initial trophic controls and variations in chemical composition[J]. JOURNAL OF HYDROLOGY,2019,574:430-435. |
| APA | Ni, Maofei,&Li, Siyue.(2019).Biodegradability of riverine dissolved organic carbon in a Dry-hot Valley Region: Initial trophic controls and variations in chemical composition.JOURNAL OF HYDROLOGY,574,430-435. |
| MLA | Ni, Maofei,et al."Biodegradability of riverine dissolved organic carbon in a Dry-hot Valley Region: Initial trophic controls and variations in chemical composition".JOURNAL OF HYDROLOGY 574(2019):430-435. |
入库方式： OAI收割
来源：重庆绿色智能技术研究院
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