Journal article
Molecular fingerprints of sedimentary dissolved organic matter in mangroves: Importance to blue carbon sequestration
Chemical geology, Vol.671, 122495
05/01/2025
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Abstract
Mangroves are important organic carbon (OC) reservoirs that can mitigate climate changes. Although sedimentary dissolved organic matter (SDOM) has been established as a dominant OC component within these ecosystems, its molecular composition, origin, and fate remain largely unknown. This study examined SDOM molecules from one of the largest peri-urban mangroves and adjacent tidal flats in China by using techniques like absorption fluorescence spectroscopy and ultrahigh-resolution mass spectrometry. We found that SDOM in mangroves differs significantly from that in non-mangrove ecosystems. The presence of mangroves created higher levels of N- and S-containing SDOM molecules with depth and exhibited higher lability. However, the suboxic mangrove sediments may limit microbial activity, promoting labile SDOM preservation. Mangrove litter also contributed to the formation of carboxyl-rich alicyclic molecules in sediments, potentially transforming into biologically refractory SDOM that acts as OC sinks. As the understanding of molecular fingerprints of SDOM in mangroves is still at early stages, these findings provide molecular-level evidence that mangrove sediments promote the OC sequestration through preservation and transformation processes. This study offers crucial insights into the role of SDOM in carbon sequestration and the method could be applied into other blue carbon ecosystems.
Details
- Title
- Molecular fingerprints of sedimentary dissolved organic matter in mangroves: Importance to blue carbon sequestration
- Creators
- Zhao Liang Chen - HKUSTZhe-Xuan Zhang - HKUSTRuanhong Cai - HKUSTYuanbi Yi - HKUSTWenzhao Liang - Hong Kong University of Science and TechnologyPeter I. Macreadie - RMIT UniversityChristian J. Sanders - Southern Cross UniversityShing Yip Lee - Griffith UniversityFaming Wang - Xiaoliang Research Station for Tropical Coastal EcosystemsDing He - HKUST
- Publication Details
- Chemical geology, Vol.671, 122495
- Publisher
- Elsevier B.V
- Grant note
- This work was sup ported by the National Natural Science Foundation of China (42222061), Youth Fund of National Natural Science Foundation of China (42306044), Shenzhen-Hong Kong-Macau Science and Technol ogy Program (Category C) (SGDX20230821102400001), the Research Grants Council Hong Kong research funding (AoE/P-601/23-N and 26300822), the State Key Laboratory of Marine Pollution (SKLMP) Seed Collaborative Research Fund (SKLMP/SCRF/0044), the Marine Ecology Enhancement Fund of Hong Kong (MEEF2023008 and MEEF2024011), and funding support from the Center for Ocean Research in Hong Kong and Macau (CORE). CORE is a joint research center for ocean research between Laoshan Laboratory and HKUST. PIM thanks the support of an Australian Research Council Discovery Grant (DP200100575).
- Identifiers
- 991013236707202368
- Copyright
- © 2024 Elsevier B.V.
- Academic Unit
- Faculty of Science and Engineering; National Marine Science Centre
- Language
- English
- Resource Type
- Journal article