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Organic carbon (OC) burial in lake sediments plays important roles in the terrestrial carbon cycle and global carbon bal⁃ ance. Lake Erhai is the second largest freshwater lake in the Yunnan⁃Guizhou Plateau. There have been many studies on the chan⁃ ges in the lake ecological environment and pollution of trace metals and nutrients, but limited knowledge is available on the spatio⁃ temporal patterns in OC burial in sediment. Based on the analysis of OC content in core EH2012 and other 13 sedimentary cores in Lake Erhai, the characteristics in temporal and spatial variations of OC burial in recent 100 years were studied, and their relation⁃ ships with the climatic, anthropogenic and ecological factors were discussed. The C / N molar ratio indicated that the sedimentary OC in Lake Erhai were mainly autochthonous in source, and they displayed similar vertical trends in the cores from different lake areas. In core EH2012, for example, the OC content displayed three stages variations. The OC content were low before 1970 AD, followed by a gradual increase between 1970 and 2000 AD, then increased sharply after 2000 AD and reached the maxima in re⁃

Spatio-temporal patterns of organic carbon burial in the sediment of Lake Erhai in China during the past 100 years