Comparing the variation and influencing factors of CO2 emission from subsidence waterbodies under different restoration modes in coal mining area

Min Tan; Zhengfu Bian; Jihong Dong; Ming Hao; Junfeng Qu

doi:10.1016/j.envres.2023.116936

Comparing the variation and influencing factors of CO₂ emission from subsidence waterbodies under different restoration modes in coal mining area

Environ Res. 2023 Nov 15;237(Pt 2):116936. doi: 10.1016/j.envres.2023.116936. Epub 2023 Aug 28.

Authors

Min Tan¹, Zhengfu Bian², Jihong Dong³, Ming Hao³, Junfeng Qu⁴

Affiliations

¹ School of Public Policy and Management, China University of Mining and Technology, Xuzhou, 221116, China.
² School of Public Policy and Management, China University of Mining and Technology, Xuzhou, 221116, China. Electronic address: zfbian@cumt.edu.cn.
³ School of Environment and Spatial Informatics, China University of Mining and Technology, Xuzhou, 221116, China.
⁴ Carbon Neutrality Institute, China University of Mining and Technology, Xuzhou, 221008, China; Xuzhou Institute of Ecological Civilization Construction, Xuzhou, 221008, China.

PMID: 37648185
DOI: 10.1016/j.envres.2023.116936

Abstract

Subsidence waterbodies play an important role in carbon cycle in coal mining area. However, little effort has been made to explore the carbon dioxide (CO₂) release characteristics and influencing factors in subsidence waterbodies, especially under different restoration modes. Here, we measured CO₂ release fluxes (F(CO₂)) across Anguo wetland (AW), louts pond (LP), fishpond (FP), fishery-floating photovoltaic wetland (FFPV), floating photovoltaic wetland (FPV) in coal mining subsidence area, with unrestored subsidence waterbodies (SW) and unaffected normal Dasha river (DR) as the control area. We sampled each waterbody and tested which physical, chemical, and biological characteristics of water and sediment related to variability in CO₂. The results indicated that F(CO₂) exhibited the following patterns: FFPV > FPV > FP > SW > DR > LP > AW. Trophic lake index (TLI) and microbial biomass carbon content (MBC) in sediment had a positive impact on F(CO₂). The dominant archaea Euryarchaeota and Thaumarchaeota, and dominant bacteria Proteobacteria promoted F(CO₂). This study can help more accurately quantify CO₂ emissions and guide CO₂ future emission reduction and subsidence waterbodies estoration.

Keywords: CO(2) flux; Coal mining area; Different restoration modes; Environmental factor; Subsidence waterbodies.