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Effects of Spartina alterniflora Invasion and Aquaculture Reclamation on Anaerobic Mineralization of Soil Organic Carbon in Min River estuary

• 1、School of Geographical Sciences,Fujian Normal University,Fuzhou 350007

Abstract：In recent years,plant invasion and reclamation are two major threats to the world\'s coastal wetlands and significantly altering coastal carbon cycling. In this paper,we studied the effects of habitat modification on soil organic carbon mineralization in wetland in the Min River Estuary in southeastern China. The soil physical and chemical parameters of the three wetland habitats (native mudflats, mudflats that were modified into marshes by invasive Spartina alterniflora, and aquaculture ponds) were measured simultaneously. The mean soil carbon mineralization rates in native mudflats, S. alterniflora marsh and aquaculture ponds were 31.68±5.24 μg g-1 d-1, 34.76±5.26 μg g-1 d-1and 35.80±5.52 μg g-1 d-1, respectively. The mean soil organic carbon mineralization rates was significantly higher in aquaculture ponds, followed by S. alterniflora marsh and native mudflats. There were significant positively correlations between sediment soil organic carbon mineralization and sediment C substrates (e.g., SOC and MBC) (p<0.01).?These findings indicate that both S. alterniflora invasion and wetland reclamation enhance SOC mineralization, potentially exacerbating global warming and impacting estuarine ecosystems.

Keywords： Estuary wetlands Habitat change vSoil carbon mineralization vCarbon dioxide Methane??