Authors

Luu Viet Dung 1,2* , Pham Thao Nguyen 3 , Nguyen Thi Hoa 4 , Nguyen Thi Tuyet Chinh 2 , Nguyen Tai Tue 1,2 , Tran Dang Quy 1,2 , Mai Trong Nhuan 1,2

Affiliations

1  Key Laboratory of Geoenvironment and Climate Change Response, VNU University of Science, Vietnam National University, Hanoi, Vietnam; dungluuviet@gmail.com; tuenguyentai@hus.edu.vn; quytrandang@gmail.com; nhuanmt@vnu.edu.vn

2  Faculty of Geology, VNU University of Science, Vietnam National University, Hanoi, Vietnam; dungluuviet@gmail.com; nguyenthituyetchinh97@gmail.com; tuenguyentai@hus.edu.vn; quytrandang@gmail.com; nhuanmt@vnu.edu.vn;

3 Graduate School of Science and Engineering, Ehime University, Matsuyama Japan; thaonguyen3m@gmail.com

4 Vietnam – Japan University, Vietnam National University, Hanoi, Vietnam; 19110009@st.vju.ac.vn

*Correspondence: dungluuviet@gmail.com; Tel.: +84–904729009

Abstracts

Mangroves in Tien Yen Bay, Quang Ninh province are considered typical mangrove ecosystems in Northern Vietnam. Mangroves play a significant role in carbon storage, and mangrove sediment is the largest carbon pool in this ecosystem. The present study aims to determine the role of the carbon source from mangroves to provide the organic matter in intertidal sediments by the stable isotopes approach. The δ13C of sediments ranged from –27.36 ± 0.28‰ in mangrove forest (RNM) to –26.28 ± 0.05‰ in the tidal flat with seagrass (SG1). Stable isotope mixing model results showed that mangrove materials are an important source of sedimentary organic carbon (OC), providing 64.6 ± 14.9%, 38.4 ± 14.9%, 39.8 ± 15%, and 48.8 ± 14.9% for the site RNM, SG1, SG2, and SG3, respectively. The second OC source in mangrove sediment is suspended particulate organic matter (POM). The POM in this area includes fine mangrove materials, which are exchanged with coastal waters through the tidal dynamics. The present results suggested that mangroves are important in accumulating organic carbon and fine–grained sediments in the Tien Yen Bay, contributing important values to climate change mitigation and maintaining biodiversity in this area.

Keywords

Carbon sources; Mangroves; Stable isotopes; Sediment; Tien Yen.

Cite this paper

Dung, L.V.; Nguyen, P.T.; Hoa, N.T.; Chinh, N.T.T.; Tue, N.T.; Quy, T.D.; Nhuan, M.T. Sources of sedimentary organic carbon in coastal ecosystems from the Tien Yen Bay, Quang Ninh. VN. Hydrometeorol. 2021, 9, 76-85. 

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