| Citation: | Pingping Zhang, Min Cai, Mingxian Han, Jibin Han, Xiying Zhang, Jian Yang, Hongchen Jiang. Increased Anoxia Promotes Organic Carbon Mineralization in Surface Sediments of Saline Lakes. Journal of Earth Science, 2025, 36(5): 2240-2250. doi: 10.1007/s12583-024-0155-4
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Global warming and human activities have reduced the concentrations of dissolved oxygen in the bottom water of lakes, resulting in increased anoxia in surface sediments. This increased anoxia likely alters carbon cycling processes (e.g., organic carbon mineralization) by altering microbial community composition and functions in lakes. However, it remains unclear how organic carbon mineralization responds to increased anoxia in surface sediments of lakes (particularly saline lakes). In this study, CO2 production in surface sediments of six lakes with different salinity (0.47–250 g/L) on the Tibetan Plateau was investigated using microcosm incubations under aerobic and anaerobic conditions, respectively, followed by geochemical and microbial analyses. The results showed that for the freshwater lake, CO2 production rates in anaerobic sediment microcosms were significantly (
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