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. Permafrost thawing in peatlands has the potential to alter the catchmentexport of dissolved organic carbon (DOC), thus influencing the carbon balanceand cycling in linked aquatic and ocean ecosystems. Peatlands along thesouthern margins of the Eurasian permafrost are relatively underexploreddespite the considerable risks associated with permafrost degradation due toclimate warming. This study examined dynamics of DOC export from a permafrostpeatland catchment located in northeastern China during the 2012 to 2014growing seasons. The estimated annual DOC loads varied greatly between 3211and 19 022 kg yr −1 , with a mean DOC yield of4.7 g m −2  yr −1 . Although the estimated DOC yield was in thelower range compared with other permafrost regions, it was still significantfor the net carbon balance in the studied catchment. There were stronglinkages between daily discharge and DOC concentrations in both wet and dryyears, suggesting a transport-limited process of DOC delivery from thecatchment. Discharge explained the majority of both seasonal and interannualvariations of DOC concentrations, which made annual discharge a goodindicator of total DOC load from the catchment. As indicated by threefluorescence indices, DOC source and chemical characteristics tracked theshift of flow paths during runoff processes closely. Interactions between theflow path and DOC chemical characteristics were greatly influenced by theseasonal thawing of the soil active layer. The deepening of the active layerdue to climate warming likely increases the proportion ofmicrobial-originated DOC in baseflow discharge.

hydrology and earth system sciences

Hydrological processes and permafrost regulate magnitude, source and chemical characteristics of dissolved organic carbon export in a peatland catchment of northeastern China