Characteristic and relationship were analyzed between organic carbon and water content in four types of wetlands (one cultivated wetland and three typical natural wetlands including fen, marsh and marshy meadow) in Sanjiang Plain of Northeastern China. Results show that there are distinct differences in the depths of organic carbon deposition, the organic carbon and water content in sediment profiles of these four type wetlands. There are significant positive correlations between organic carbon and water content in sediment profiles of the same type wetland (p < 0.01; R2 = 0.8276, 0.9917, 0.9916 and 0.9782 for cultivated wetland, fen, marsh and marshy meadow, respectively). The trend for evolution of ecological and environmental functions of wetland ecosystems is discussed based on the analysis of the relationship between soil organic carbon and water content. The results further illustrate the viewpoint that the protection and restoration of wetlands could lessen the global climate change caused by the increase in atmospheric CO2 concentration.
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