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The content, composition, and influencing factors of organic carbon in the sediments of two types of constructed wetlands

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Abstract

Constructed wetland is a common measure for water purification and biodiversity conservation, but the mechanism of carbon storage is still unclear. Here, we researched the content and composition of soil organic carbon (SOC) and the influencing factors in surface sediment in surface flow constructed wetlands (SFCW) and subsurface flow constructed wetlands (SSFCW). Results showed that the content and storage of SOC in SSFCW were significantly higher than those in SFCW. However, the higher proportion of light fraction organic carbon (LFOC) and lower proportion of heavy fraction organic carbon (HFOC) in SSFCW indicated that SSFCW had less stable organic carbon storage than SFCW. The composition of SOC in the two types of constructed wetlands was mainly affected by total nitrogen, which suggesting carbon-nitrogen coupling in constructed wetlands. The abundant microbial species in SSFCW and their positive correlation with SOC could explain the higher carbon storage in SSFCW than in SFCW. In addition, plant biomass was the principle factor limiting LFOC proportion in SFCW, while it was moisture content in SSFCW. The study has important implications for understanding and management of ecological function of carbon sequestration in contrasted wetlands, and also provides a special perspective to understand the carbon storage mechanism in wetlands.

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Acknowledgements

We thank the editor and the two anonymous reviewers for their valuable suggestions on the manuscript. We would like to thank Editage (www.editage.com) for English language editing.

Funding

This study was supported by the “National Natural Science Foundation of China” (No.

32071523) and the “Natural Science Foundation of Shandong Province” (No. ZR2017MC013).

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Authors and Affiliations

  1. Environment Research Institute, Shandong University, Qingdao, 266237, China

    Ruirui Yang, Jiaohui Fang, Di Zhao, Junyu Dong, Renqing Wang & Jian Liu

  2. School of Architecture and Urban Planning, Shandong Jianzhu University, Jinan, 250101, China

    Qingqing Cao

  3. School of Life Sciences, Shandong University, Qingdao, 266237, China

    Renqing Wang

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  1. Ruirui Yang
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  2. Jiaohui Fang
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Contributions

RY and JL contributed to the study conception and design. Material preparation, data collection, and analysis were performed by RY, JF, QC, DZ, JD, and RW. The first draft of the manuscript was written by RY and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.

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Correspondence to Jian Liu.

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The sample collection in this study was approved by the Management Committee of the Zhaoniu River constructed wetland and Daotun catchment.

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Yang, R., Fang, J., Cao, Q. et al. The content, composition, and influencing factors of organic carbon in the sediments of two types of constructed wetlands. Environ Sci Pollut Res 28, 49206–49219 (2021). https://doi.org/10.1007/s11356-021-14134-8

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