水文节律是影响湖泊湿地土壤碳循环的重要因素.堑秋湖是鄱阳湖传统的渔业生产方式,对鄱阳湖碟形湖水文节律具有显著影响.因此,本文研究了堑秋湖对鄱阳湖洲滩土壤碳循环的影响.结果表明,堑秋湖围堤内外洲滩土壤总有机碳含量无显著差异,但围堤内土壤轻组有机碳含量比围堤外低35.03%.围堤内土壤有机碳(SOC)矿化速率明显高于围堤外.围堤内SOC矿化的平均Q<sub>10</sub>为2.72,比围堤外低4.83%,但两者SOC矿化的水分敏感性没有显著差异.围堤内外SOC矿化速率分别与土壤可溶性有机碳和土壤轻组氮含量相关关系最为显著.综上所述,堑秋湖围堤已经改变了鄱阳湖洲滩的土壤碳循环过程.模拟湖泊湿地土壤碳循环时需要充分考虑当地渔业生产的影响.;Water regime changes caused by natural and anthropogenic activities can significantly affect soil carbon cycle in wetland ecosystem. Some fishery activities could greatly impact on wetland water regime, but, till now, their influences on wetland soil carbon cycle are still not fully understood. In this paper, we investigated the effects of the dike of Lake Dahuchi, which was used to restrain the fish at the low water period, on soil carbon cycle in the littoral wetland. Our results showed that soil total organic carbon (TOC) was not changed by the dike, but soil light fraction of organic carbon inside the dike was significantly lower than that outside the dike by 35.03%. Meanwhile, the littoral wetland soil inside the dike had higher soil organic carbon (SOC) mineralization rate, but lower temperature sensitivity. The Q<sub>10</sub> of SOC mineralization inside and outside the dike were 2.72 and 2.85, respectively. The dike did not significantly change the moisture sensitivity of SOC mineralization. In addition, the determining factors of SOC mineralization rates inside and outside the dike were dissolved organic carbon and light fraction of total nitrogen, respectively. In summary, soil carbon cycle in littoral wetland in Poyang Lake could be modified by fishery activities. Scientists should take account of the effects of fishery in simulating soil carbon cycle of the wetland ecosystem in future.