Abstract: Reclamation of estuarine wetlands into aquaculture ponds has been an important eco-environment problem in coastal areas, with consequences on carbon and nitrogen cycling of estuaries. In this study, we measured methane (CH₄) and nitrous oxide (N₂O) production potentials of the surface sediments form Cyperus malaccensis marsh and reclaimed shrimp pond in the Shanyu shoal of the Minjiang River estuary by anaerobic incubation experiment from May 2016 to March 2017. The results showed that CH₄ production potentials of surface sediments from the C. malaccensismarsh and shrimp ponds varied from 0.33 to 215.2 and 0.13 to 9.41 ng·g^-1·d^-1, with mean values of 40.07±23.00 and 2.16±0.98 ng·g^-1·d^-1, respectively. CH₄ production potentials in autumn and summer were higher than that in spring and winter.  N₂O production potentials of the sediments in the C. malaccensis marsh and shrimp ponds ranged from 0.43 to 0.80 ng·g^-1·d^-1 and 0.45 to 0.84 ng·g^-1·d^-1, with mean values of 0.58±0.01 and 0.61±0.01 ng·g^-1·d^-1, respectively. CH₄ production potential of the sediments from C. malaccensis marsh was significantly higher than that from shrimp ponds (P<0.01). There was no significant difference in N₂O production potentials between the two ecosystems (P>0.05).

Key words: intensive management, Moso bamboo forest, nitrogen pool, soil enzyme., carbon pool