Fig. 3From: Changes of lake organic carbon sinks from closed basins since the Last Glacial Maximum and quantitative evaluation of human impactsOrganic carbon related data from lake records and modern observations in closed basins of the Qilian Mountains. a TOC, TN, organic δ13C from soil samples versus elevations. b Organic carbon accumulation rates in closed-basin lakes of the Qilian Mountains. c Topsoil organic carbon contents (0–30 cm) [56]. d Modern NPP distributions (year 2000–2015) [45]Back to article page