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Effect of reclamation on soil organic carbon pools in coastal areas of eastern China

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Abstract

The coastal wetlands of eastern China form one of the most important carbon sinks in the world. However, reclamation can significantly alter the soil carbon pool dynamics in these areas. In this study, a chronosequence was constructed for four reclamation zones in Rudong County, Jiangsu Province, eastern China (reclaimed in 1951, 1974, 1982, and 2007) and a reference salt marsh to identify both the process of soil organic carbon (SOC) evolution, as well as the effect of cropping and soil properties on SOC with time after reclamation. The results show that whereas soil nutrient elements and SOC increased after reclamation, the electrical conductivity of the saturated soil extract (ECe), pH, and bulk density decreased within 62 years following reclamation and agricultural amendment. In general, the soil’s chemical properties remarkably improved and SOC increased significantly for approximately 30 years after reclamation. Reclamation for agriculture (rice and cotton) significantly increased the soil organic carbon density (SOCD) in the top 60 cm, especially in the top 0–30 cm. However, whereas the highest concentration of SOCD in rice-growing areas was in the top 0–20 cm of the soil profile, it was greater at a 20–60 cm depth in cottongrowing areas. Reclamation also significantly increased heavy fraction organic carbon (HFOC) levels in the 0–30 cm layer, thereby enhancing the stability of the soil carbon pool. SOC can thus increase significantly over a long time period after coastal reclamation, especially in areas of cultivation, where coastal SOC pools in eastern China tend to be more stable.

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Acknowledgements

We appreciate the helpful comments provided by two anonymous reviewers. This work was supported by the National Natural Science Foundation of China (Nos. 41701371, 41230751, and 41201213), The Ministry of Education of Humanities and Social Science project (No. 17YJCZH085), University Science Research Project of Jiangsu Province (No.17KJB170006), The Jiangsu Normal University Foundation (15XLR017), the Jiangsu Students’ Innovation and Entrepreneurship Training Program (No. 201610320043Z), research and innovation plan of postgraduate research in Jiangsu Province (KYCX17_1686), and a project funded by the Priority Academic Development Program of Jiangsu Higher Education Institutions.

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Authors and Affiliations

  1. School of Geography, Geomatics and Planning, Jiangsu Normal University, Xuzhou, 221116, China

    Jianguo Li, Wenhui Yang, Qiang Li, Zhongqi Zhang & Lili Liu

  2. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing, 210023, China

    Lijie Pu & Yan Xu

  3. Key Laboratory of Coastal Zone Exploitation and Protection, Ministry of Land and Resources, Nanjing, 210023, China

    Lijie Pu

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  1. Jianguo Li
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Correspondence to Lijie Pu.

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Li, J., Yang, W., Li, Q. et al. Effect of reclamation on soil organic carbon pools in coastal areas of eastern China. Front. Earth Sci. 12, 339–348 (2018). https://doi.org/10.1007/s11707-018-0680-5

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