文献类型：期刊文献

英文题名：Effects of coastal marsh conversion to shrimp aquaculture ponds on sediment nitrogen fixation

作者：Liu, Cheng[1] Li, Niu[2] Shao, Xuexin[2] Gao, Dengzhou[3] Xia, Jiangbao[1] Cui, Qian[1] Zhang, Dongjie[1]

第一作者：Liu, Cheng

通信作者：Shao, XX[1]

机构：[1]Binzhou Univ, Shandong Key Lab Ecoenvironm Sci Yellow River Delt, Binzhou, Peoples R China;[2]Chinese Acad Forestry, Res Inst Subtrop Forestry, Wetland Ecosyst Res Stn Hangzhou Bay, Hangzhou, Peoples R China;[3]East China Normal Univ, State Key Lab Estuarine & Coastal Res, Shanghai, Peoples R China

年份：2022

卷号：9

外文期刊名：FRONTIERS IN MARINE SCIENCE

收录：;Scopus(收录号：2-s2.0-85139760710);WOS:【SCI-EXPANDED(收录号:WOS:000868542000001)】；

基金：This work was supported by the Natural Science Foundation of China (grant numbers: 31870597, 41901118 and 42101111). It was also funded by the Special fund for cooperation of Zhejiang Province and Chinese academy of forestry (2021SY03); the Youth Innovation Support Program of Shandong Universities [grant number 2021KJ081]; the Shandong Provincial Natural Science Foundation (grant number ZR2021QD101); grants from China Postdoctoral Science Foundation (2021M691020); Open Fund of Key Laboratory of Geographic Information Science (Ministry of Education), East China Normal University [grant number KLGIS2021A03]; the Fundamental Research Funds for the Central Universities; and the PhD research startup foundation of Binzhou University [grant numbers 2021Y14 and 2021Y36].

语种：英文

外文关键词：N fixation; N cycling; agricultural reclamation; shrimp aquaculture; coastal wetland; environmental implication

摘要：As a common reclamation practice in global estuaries and coasts, conversion of natural wetlands to aquaculture ponds for food demand had significant effects on nitrogen (N) cycling processes. However, the response of sedimemt N fixation process on this conversion remains poorly understood. Here, slury incubation experiment combined with N-15 isotope tracing method and molecular analysis technique were used to investigate the influences of conversion of natural marshland to shrimp ponds on sediemt N fixation process. The results showed that conversion of natural marshland to shrimp ponds significantly promoted sediment N fixation rate. The increasing of sediment N fixation rate may be mainly attributed to the change of sediment EC, TOC and Fe2+/Fe3+ rather than the change of N fixation gene abundance. In addition, there was no obvious difference in sediment N fixation rate between 5-year-old shrimp ponds and 18-year-old shrimp ponds, which may be ascribed to the increasing inhibiting effect of inorganic N concentration with reclamation time. Overall, our findings highlighted that conversion of natural wetlands to aquaculture ponds can affect the N budgets in estuarine and coastal regions by altering the sediment N fixation process.