How hydrology and anthropogenic activity influence the molecular composition and export of dissolved organic matter: Observations along a large river continuum
文献类型：期刊论文
| 作者 | Zhou, Yongqiang; Yao, Xiaolong; Zhou, Lei; Zhao, Zhonghua; Wang, Xiaolong; Jang, Kyoung-Soon; Tian, Wei; Zhang, Yunlin; Podgorski, David C.; Spencer, Robert G. M. |
| 刊名 | LIMNOLOGY AND OCEANOGRAPHY
 |
| 出版日期 | 2021 |
| 卷号 | 66期号:5页码:1730-1742 |
| 英文摘要 | Large rivers are the main arteries for transportation of carbon to the ocean; yet, how hydrology and anthropogenic disturbances may change the composition and export of dissolved organic matter along large river continuums is largely unknown. The Yangtze River has a watershed area of 1.80 x 10(6) km(2). It originates from the Qinghai-Tibet Plateau and flows 6300 km eastward through the center of China. We collected samples (n = 271) along the river continuum and analyzed weekly samples at the most downstream situated gauging station in 2017-2018 and gathered long-term (2006-2018) water quality data. We found higher gross domestic product, population density, and urban and agricultural land use downstream than upstream of the Three Gorges Dam, coinciding with higher dissolved organic carbon (DOC), UV absorption (a(254)), specific ultraviolet absorbance (SUVA(254)), parallel factor analysis-derived C1-C5, aliphatic compounds, and lower a(250):a(365) and spectral slope (S275-295). Chemical oxygen demand, humic-like C1-C2 and C6, and protein-like C4 and C7 increased, while dissolved oxygen and ammonium decreased with increasing discharge at most of the sites studied, including the intensively monitored downstream site. The annual DOC fluxes were ca. 1.5-1.8 Tg yr(-1), and 12-18% was biodegradable in a 28-d bio-incubation. Our results highlight that urbanization and stormwater periods enhanced the export of both terrestrial organic-rich substances and household effluents from nearshore residential areas. Our study emphasizes the continued need to protect the Yangtze River watershed as increased organic carbon loading or altered composition and bio-lability may change the ecosystem function and carbon cycling. |
| 源URL | [http://159.226.73.51/handle/332005/20633]  |
| 专题 | 中国科学院南京地理与湖泊研究所 |
| 推荐引用方式 GB/T 7714 | Zhou, Yongqiang,Yao, Xiaolong,Zhou, Lei,et al. How hydrology and anthropogenic activity influence the molecular composition and export of dissolved organic matter: Observations along a large river continuum[J]. LIMNOLOGY AND OCEANOGRAPHY,2021,66(5):1730-1742. |
| APA | Zhou, Yongqiang.,Yao, Xiaolong.,Zhou, Lei.,Zhao, Zhonghua.,Wang, Xiaolong.,...&Wu, Fengchang.(2021).How hydrology and anthropogenic activity influence the molecular composition and export of dissolved organic matter: Observations along a large river continuum.LIMNOLOGY AND OCEANOGRAPHY,66(5),1730-1742. |
| MLA | Zhou, Yongqiang,et al."How hydrology and anthropogenic activity influence the molecular composition and export of dissolved organic matter: Observations along a large river continuum".LIMNOLOGY AND OCEANOGRAPHY 66.5(2021):1730-1742. |
入库方式： OAI收割
来源：南京地理与湖泊研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。