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Linking riverine partial pressure of carbon dioxide to dissolved organic matter optical properties in a Dry-hot Valley Region
Ni, Maofei1,2; Li, Siyue1; Santos, Isaac3; Zhang, Jing1,4; Luo, Jiachen1,2
2020-02-20
摘要The mineralization of dissolved organic matter (DOM) can partially explain riverine carbon dioxide (CO2) emissions to the atmosphere. However, little is known about how the DOM origin and composition drive CO2 partial pressures (pCO(2)). Here, we reveal links between aquatic pCO(2), DOM optical parameters (a(254), a(350) and S-275(-295) and S-350(-400)) and nutrients in a subtropical river in China's Dry-hot Valley Region. Biodegradation preferentially decomposed low molecular weight (LMW) DOMs, increasing high molecular weight (HMW) DOMs along the main stem. pCO(2) was positively correlated with aromatic and lignin compounds, but negatively correlated with DOM molecular weight. Aquatic respiration of DOMs largely explained the pCO(2) levels in the drought period, while terrestrial inputs were a pCO(2) source in the initial-wet period. Our results illustrate how both DOM concentrations and speciation can explain pCO(2) distribution and sources in rivers. (C) 2019 Elsevier B.V. All rights reserved.
关键词Dissolved organic matter (DOM) (CO)2partial pressure (pCO(2)) Trophic levels pCO(2 )- DOM couplings Longitudinal Range-Gorge region
DOI10.1016/j.scitotenv.2019.135353
发表期刊SCIENCE OF THE TOTAL ENVIRONMENT
ISSN0048-9697
卷号704页码:10
通讯作者Li, Siyue(syli2006@163.com)
收录类别SCI
WOS记录号WOS:000504672800089
语种英语