Anthropogenic Reshaping of Seasonal pCO2 and CO2 Flux Dynamics in a Karst River by Effluent
Description
This study resolves the spatiotemporal evolution and underlying biogeochemical mechanisms ofaquatic partial pressure of CO2 (pCO2) and water-air CO2 flux (f CO2 ) in a wastewater-supplied karst river. The dataset covers comprehensive aquatic hydrochemical indicators, as well as monitoringrecords of in-stream pCO2 and water-atmosphere CO2 flux. The results reveal prominentspatiotemporal heterogeneity of carbon metrics across river segments. Inputs of municipal wastewaterdeliver abundant nutrients and greatly stimulate fluvial heterotrophic metabolism, leading tosignificant correlations between dissolved oxygen, ΔDO, nutrients and aquatic CO2 concentrations; these substances act as core regulators governing aquatic CO2 variations. Wastewater dischargemarkedly elevates the river's carbon emission capacity and restructures the natural seasonal rhythm ofcarbon cycling in receiving waters. The above findings advance the mechanistic understanding of howurbanization disturbs aquatic carbon cycles, and provide multi-dimensional theoretical support fordeciphering the driving mechanisms of CO2 transport and transformation in complex urban rivercontinuums.
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Institutions
- Guizhou UniversityGuizhou, Guiyang