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Lakes are an important natural source of CH4 to the atmosphere. However,the multi-seasonal CH4 efflux from lakes has been rarely studied. Inthis study, the CH4 efflux from Poyang Hu, the largest freshwater lakein China, was measured monthly over a 4-year period by using thefloating-chamber technique. The mean annual CH4 efflux throughout the 4years was 0.54 mmol m−2 day−1, ranging from 0.47 to0.60 mmol m−2 day−1. The CH4 efflux had a high seasonalvariation with an average summer (June to August) efflux of1.34 mmol m−2 day−1 and winter (December to February) efflux ofmerely 0.18 mmol m−2 day−1. The efflux showed no apparent dielpattern, although most of the peak effluxes appeared in the late morning,from 10:00 to 12:00 CST (GMT + 8). Multivariate stepwise regression on aseasonal scale showed that environmental factors, such as sedimenttemperature, sediment total nitrogen content, dissolved oxygen, and totalphosphorus content in the water, mainly regulated the CH4 efflux.However, the CH4 efflux only showed a strong positive linear correlationwith wind speed within 1 day on a bihourly scale in the multivariateregression analyses but almost no correlation with wind speed on diurnal andseasonal scales

Timescale dependence of environmental controls on methane efflux from Poyang Hu, China