Influences of anthropogenic acids on carbonate weathering and CO2 sink in an agricultural karst wetland (South China)

Anthropogenic acids significantly alter carbonate weathering and CO₂ sink dynamics in karst wetlands, threatening ecological stability. Research in South China's Huixian Karst Wetland revealed that nitric (HNO₃) and sulfuric (H₂SO₄) acids contribute 20–27% to carbonate weathering, disrupting natural hydrogeochemical processes. These acids, linked to agricultural runoff, also reduce CO₂ absorption by up to 41% in groundwater, potentially impacting global carbon cycles. The study combined isotopic analysis and stoichiometric modeling to quantify these effects, offering a framework for assessing acid-driven changes in karst ecosystems. Findings underscore the need to address anthropogenic acid inputs in wetland restoration efforts, particularly in intensive agricultural regions.

Li, J., Xie, H., Li, J., Yang, G., Xie, Y., Wang, J., Zhou, C., & Zou, S. (2023). Influences of anthropogenic acids on carbonate weathering and CO2 sink in an agricultural karst wetland (South China). Ecological Indicators, 150, 110192. https://doi.org/10.1016/j.ecolind.2023.110192