海洋科学2023，Vol.47Issue(12)：21-29,9.DOI:10.11759/hykx20210531003
天然海藻场沿岸表层沉积物有机质的分布特征与来源
Distribution characteristics and sources of organic matter in surface sediments along the coast of natural seaweed bed
摘要
Abstract
Seaweed beds are among the most biodiverse ecosystems,and sedimentary organic matter is one of the important material foundations supporting the biodiversity of seaweed beds.In this study,the natural seaweed bed along the coast of northern Shengshan Island,Zhejiang Province,was selected as the research area,and sediments and endmember samples were collected from June to August during macroalgae littering.The grain-size composi-tion,total organic carbon(TOC),total nitrogen(TN),carbon-nitrogen ratio(C/N),and stable carbon and nitrogen isotopes(δ13C and δ15N)of the sediment samples were analyzed.The source and variation of the sedimentary or-ganic matter were evaluated using the Bayesian stable isotope mixing model.The results are summarized as follows:1)The silt content was the largest,and the sand content was the lowest in the sediments along the seaweed bed.Thus,the sediment type was clayey silt.2)The TOC,TN,C/N,δ13C,and δ15N ranges of sediments were 0.70％-2.41％,0.11％-0.41％,5.53-6.48,-21.79‰--19.60％o,and 1.56‰-4.26‰,respectively.In terms of spatial distribution,the TOC and TN decreased with increasing offshore distance.3)The relation among the grain-size composition,C/N ratio,δ13C,and δ15N showed that the sedimentary organic matters were mainly derived from the mixed contribution of macroalgae and phytoplankton.4)According to the Bayesian isotope mixing model,the con-tribution rate of macroalgae to sediment organic matter was 2.30％-45.60％.In terms of spatial distribution,the contribution rate of macroalgae to sediment organic matter decreased with increasing offshore distance.5)The as-sessment results of macroalgal detritus production and sediment organic carbon deposition showed that 11.98％of the detrital organic matter produced by macroalgae was deposited into the surface sediments along the seaweed bed.This study provides data support for assessing the production scale and spatiotemporal distribution of macroalgae debris and the conservation function of fishery resources of the seaweed bed.关键词
海藻场/沉积物有机质/稳定同位素/来源/贡献率Key words
seaweed bed/sedimentary organic matter/stable isotope/source/contribution rate分类
生物科学引用本文复制引用
张健,李训猛,程晓鹏,黄宏,王凯,章守宇..天然海藻场沿岸表层沉积物有机质的分布特征与来源[J].海洋科学,2023,47(12):21-29,9.基金项目
国家自然科学基金(41876191) （41876191）
现代农业产业技术体系专项(CARS-50) （CARS-50）
国家重点科研计划(2019YFD0901303)[The National Natural Science Foundation of China,No.41876191 （2019YFD0901303）
China Agriculture Research System,No.CARS-50 （）
National Key R&D Program of China,No.2019YFD090130] （）
