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引用本文:沈瑞昌,兰志春,方长明,陈家宽.“堑秋湖”围堤改变鄱阳湖洲滩湿地土壤碳循环过程.湖泊科学,2018,30(5):1260-1270. DOI:10.18307/2018.0509
SHEN Ruichang,LAN Zhichun,FANG Changming,CHEN Jiakuan.The dikes of the sub-lakes change soil carbon cycle in the littoral wetland in Poyang Lake. J. Lake Sci.2018,30(5):1260-1270. DOI:10.18307/2018.0509
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“堑秋湖”围堤改变鄱阳湖洲滩湿地土壤碳循环过程
沈瑞昌1,2,3,4, 兰志春1,4,5, 方长明2, 陈家宽2
1.南昌大学生命科学研究院流域生态学研究所, 南昌 330031;2.复旦大学生物多样性科学研究所, 上海 200433;3.南昌大学鄱阳湖环境与资源利用教育部重点实验室, 南昌 330031;4.江西鄱阳湖湿地生态系统国家定位观测研究站, 南昌 330038;5.流域生态与地理环境监测国家测绘地理信息局重点实验室, 南昌 330209
摘要:
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Q10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.
关键词:  湿地  土壤碳循环  水文节律  渔业生产  气候变化  鄱阳湖
DOI:10.18307/2018.0509
分类号:
基金项目:国家自然科学基金项目(31600381)、中国博士后科学基金面上项目(2017M620129)、江西省科技厅青年基金项目(20171BAB214008)和流域生态与地理环境监测国家测绘地理信息局重点实验室开放课题(WE2015009)联合资助.
The dikes of the sub-lakes change soil carbon cycle in the littoral wetland in Poyang Lake
SHEN Ruichang1,2,3,4, LAN Zhichun1,4,5, FANG Changming2, CHEN Jiakuan2
1.Center for Watershed Ecology, Institute of Life Science, Nanchang University, Nanchang 330031, P. R. China;2.Institute of Biodiversity Science, Fudan University, Shanghai 200433, P. R. China;3.Key Laboratory of Poyang Lake Environment and Resource Utilization, Ministry of Education, Nanchang University, Nanchang 330031, P. R. China;4.National Ecosystem Research Station of Jiangxi Poyang Lake Wetland, Nanchang 330038, P. R. China;5.Key Laboratory of Watershed Ecology and Geographical Environment Monitoring, NASG, Nanchang 330209, P. R. China
Abstract:
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 Q10 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.
Key words:  Wetland  soil carbon cycle  water regime  fishery  climate change  Poyang Lake
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