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Spatiotemporal Patterns in pCO2 and Nutrient Concentration: Implications for the CO2 Variations in a Eutrophic Lake
Jie Xu1, Zheng Zhou1, Jie Chen1
1Yangtze River Basin Ecological Environment Monitoring and Scientific Research Center, Yangtze River Basin Ecological Environment Supervision and Administration Bureau, Ministry of Ecology and Environment, Wuhan 430010, China.
International Journal of Environmental Research and Public Health
|October 14, 2022
Summary
Catchment development significantly impacts lake water quality and carbon dioxide (CO2) levels. Human activities in lake catchments increase nutrients and CO2, affecting aquatic ecosystems and requiring consideration in emission models.
Area of Science:
- Environmental Science
- Limnology
- Water Quality Management
Background:
- Lakes serve as indicators of environmental change, but long-term data on anthropogenic impacts on nutrients and CO2 are limited.
- Understanding catchment influences is crucial for managing lake ecosystems and their role in global carbon cycles.
Purpose of the Study:
- To analyze spatiotemporal variations in nutrient concentrations and partial pressure of carbon dioxide (pCO2) in Taihu Lake.
- To investigate the correlation between catchment anthropogenic activities (GDP, wastewater discharge) and lake water quality parameters.
- To assess the impact of catchment development on nutrient dynamics and CO2 levels in a large eutrophic lake.
Main Methods:
- Analyzed nutrient concentrations (TN, TP, NO3-, NH4+) and pCO2 in Taihu Lake from 1992-2006.
- Correlated water quality data with catchment Gross Domestic Product (GDP) and Wastewater Discharge (WD).
- Compared water quality across three distinct lake zones: inflow river mouth, transition bay, and central lake.
Main Results:
- Nutrient concentrations and pCO2 were significantly higher in the inflow river mouth zone compared to central Taihu Lake.
- Catchment GDP and WD showed significant positive correlations with temporal variations in nutrient levels and pCO2.
- pCO2 exhibited negative correlations with chlorophyll a and dissolved oxygen saturation, but positive correlations with nutrient concentrations (TN, TP, NH4+) in the inflow zone.
Conclusions:
- Anthropogenic activities in the catchment profoundly influence Taihu Lake's water quality and CO2 concentrations.
- External nutrient inputs from catchment development are a primary driver of observed changes.
- Catchment effects must be integrated into models estimating CO2 emissions from human-impacted eutrophic lakes.
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