Effects of land use and dissolved organic matter on pCO2 are dependent on stream orders and hydrological seasonality in a low-order karst river

被引：2

作者：

Ma, Yongmei ^{[1
]}

Ni, Maofei ^{[2
]}

Gu, Shijie ^{[3
]}

Zhang, Liuqing ^{[1
]}

Sun, Huaiwei ^{[4
]}

Tang, Wei ^{[5
]}

Li, Siyue ^{[6
]}

机构：

[1] Key Laboratory of Reservoir Aquatic Environment, Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing

[2] College of Eco-Environmental Engineering, Guizhou Minzu University, Guiyang

[3] Institute of Environment and Ecology, Shenzhen International Graduate School, Tsinghua University, Shenzhen

[4] School of Civil and Hydraulic Engineering, Huazhong University of Science and technology, Wuhan

[5] Administration office for Wu Shan Dachang lake national wetland park, Chongqing

[6] School of Environmental Ecology and Biological Engineering, Institute of Changjiang Water Environment and Ecological Security, Hubei Key Laboratory of Novel Reactor and Green Chemical Technology, Wuhan Institute of Technology, Wuhan

来源：

Science of the Total Environment | 2024年 / 957卷

关键词：

CO[!sub]2[!/sub] partial pressure (pCO[!sub]2[!/sub]); Dissolved organic matter (DOM); Karst river; Land use; Stream order;

D O I：

10.1016/j.scitotenv.2024.177502

中图分类号：

学科分类号：

摘要：

Human activities and stream accumulation influence carbon loadings, altering the distributions and characteristics of dissolved inorganic and organic carbon in rivers. It is widely recognized that such alterations affect dissolved organic matter (DOM) components, water environment and river carbon dioxide (CO2) degassing, however, the control factors by which land use/land cover (LULC) and DOM components regulate the partial pressure of CO2 (pCO2) are unclear. Here, in the Daning karst river system, an extensive investigation was presented to investigate the role of LULC and DOM components in influencing the spatial and temporal variability of pCO2, as well as to investigate the regulating effect of stream order and hydrological rhythm on this influence. DOM quality and pCO2 levels exhibited significant spatial and temporal variations. In the 3rd – 4th order streams, pCO2 was correlated with protein and lignin compounds in the wet period and with DOM molecular weight in the dry period. Relatively high protein-like components (54.83 % ∼ 71.84 %, on average) and biological index (0.86–0.90, on average) indicated notable autochthonous processes. Significant relationships between pCO2 and water quality parameters were observed in the 3rd – 4th order streams in the wet period, demonstrating the role of runoff and upstream accumulation. Farmland increased pCO2 levels in the 3rd – 4th order streams, whereas forests could potentially mitigate river CO2 saturation. River pCO2 was well predicted by LULC under extended circular buffers (1000 and 2000 m in diameter). This study demonstrated that DOM and LULC directly or indirectly affect pCO2 and that the influences are largely regulated by hydrological seasonality and stream orders, which is better for understanding aquatic CO2 drivers. © 2024 Elsevier B.V.

引用

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