The bar charts show the cumulative CH 4 release with different sediment depths at thermokarst lakes of BLH-A and BLH-B. The columns with different colours represent the CH 4 release at the incubation temperatures of 5, 15, and 25 C, respectively. Values are means ± standard errors (SE) (n = 4). The doughnut charts indicate the proportions of CH 4 release from sediments at depths of 0–10 cm, 10–30 cm, and >30 cm.
