Influence of the intensive mariculture on coastal sedimentary organic matter: Insight from size-fractionated particles.

Publisher: Elsevier Country of Publication: England NLM ID: 9882895 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1879-0291 (Electronic) Linking ISSN: 01411136 NLM ISO Abbreviation: Mar Environ Res Subsets: MEDLINE

Publication: Apr. <2000- >: Kidlington, Oxford : Elsevier
Original Publication: London : Applied Science Publishers, [c1978-

Geologic Sediments* ; Kelp*; Carbon Isotopes/analysis ; Nitrogen Isotopes/analysis ; Environmental Monitoring/methods ; Carbon/analysis ; China

A portion of carbon produced from shellfish and kelp cultivation is buried in sedimentary environment, and mariculture carbon sequestration potential is an important part of marine carbon sink and has attracted worldwide attention. Total organic carbon (TOC), total nitrogen (TN) and their stable isotopes (δ ¹³ C and δ ¹⁵ N), as well as the mass distribution of these size-fractionated particles were determined in order to study the distribution and sources of TOC in Sanggou Bay. Results showed that sediment organic matter has complex sources from kelp (30.4 %), marine phytoplankton (25.6 %), shellfish (23.7 %), terrestrial input (20.3 %), and mariculture activities of shellfish and kelp was the major component in surface sediment. Approximately 44-69 % of TOC was associated with the 16-32 μm fraction. Low δ ¹³ C (-22.1 to -15.1‰) and high δ ¹⁵ N (5.0-5.7‰) were observed in fine particles (<16 μm), indicating relatively high contribution of marine phytoplankton and mariculture derived organic carbon. On the contrary, relatively higher δ ¹³ C (-20.2 to -9.2‰) and lower values δ ¹⁵ N (-4.7 to 5.2‰) in coarse particles (>32 μm) suggested that sedimentary organic carbon might be influenced by some additional sources from terrestrial input or seaweed. The mass distribution, δ ¹³ C and δ ¹⁵ N of size-fractionated particles in sediments indicated that sediment was obviously redistributed under the condition of mariculture, and further suggested that mariculture derived organic matter have modified the distribution and sources of sedimentary organic matter. This study provided great insight into distribution and source of sedimentary organic carbon from the perspective of size-fractionated particles in mariculture area.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)

Keywords: Mariculture; Organic matter; Particle size; Sanggou Bay; Stable carbon isotope; Stable nitrogen isotope; Water elutriation

0 (Carbon Isotopes)
0 (Nitrogen Isotopes)
7440-44-0 (Carbon)

Date Created: 20240131 Date Completed: 20240214 Latest Revision: 20240214

20240214

10.1016/j.marenvres.2024.106370

38295609