Establishing a terrestrial proxy based on fluorescent dissolved organic matter from sediment pore waters in the East China Sea

Li，Minchun1,2; Xie，Wei1,2; Li，Penghui1,2,3,4; Yin，Kedong1,2; Zhang，Chuanlun3,4,5

2020-09-01

10.1016/j.watres.2020.116005

WATER RESEARCH   影响因子和分区

0043-1354

1879-2448

Terrestrial organic matter occupies an important position in the oceanic organic carbon pool. Some terrestrial proxies, like the Branched and Isoprenoid Tetraether (BIT) index, have been applied successfully to indicate the relative abundance of terrestrial organic matter in marine sediments. A new terrestrial proxy derived from sediment pore water fluorescent dissolved matter (FDOM) was developed in this study. Surface sediment samples were collected from forty-two sites in the coastal region of the East China Sea (ECS) to examine the distributional patterns of FDOM. Three protein-like components (C1, C4 and C5) and two humic-like components (C2 and C3) of FDOM were identified using fluorescence excitation-emission matrices parallel factor analysis (EEMs-PARAFAC). Spatially, the intensity of these five components generally increased from the coast to the ocean with protein-like components showing a more obvious trend, which suggested that all five components had autochthonous contribution. However, the C2 and C3 proportions, especially C2 that mainly corresponds to the proportion of peak A in fluorescence excitation-emission matrices, significantly decreased from the coast to the ocean and significantly correlated with the BIT index from corresponding solid fractions. We posit that part of the humic-like components from terrestrial organic matter in sediments are released into the C2 and C3 pools in pore waters, which may be constrained by specific environmental conditions. Thus, the FDOM from pore waters can be integrated with BIT index to validate the nature of FDOM and use it as a biomarker to reflect the terrestrial input of organic matter mediated by different biogeochemical processes in coastal oceans. The proportion of peak A responsible for the fluorescence of C2 was suggest as a new terrestrial derived from FDOM.

East China Sea EEMs-PARAFAC Fluorescent dissolved organic matter Sediments Terrestrial proxy

SCI ; EI

英语

NI期刊 ; NI论文

其他

State Key R&D project of China[2018YFA0605800] ; National Natural Science Foundation of China[41776137][91851210][41673073][41530105] ; Shenzhen Key Laboratory of Marine Archaea Geo-Omics, Southern University of Science and Technology[ZDSYS20180208184349083] ; Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou)[K19313901]

Engineering ; Environmental Sciences & Ecology ; Water Resources

Engineering, Environmental ; Environmental Sciences ; Water Resources

WOS:000569155800003

PERGAMON-ELSEVIER SCIENCE LTD

20202808906671

Organic carbon ; Fluorescence ; Water ; Biogeochemistry ; Dissolution ; Sediments ; Submarine geology

Oceanography, General:471.1 ; Geology:481.1 ; Geochemistry:481.2 ; Soil Mechanics and Foundations:483 ; Light/Optics:741.1 ; Biochemistry:801.2 ; Chemical Operations:802.3 ; Organic Compounds:804.1

ENVIRONMENT/ECOLOGY

2-s2.0-85087427027

Scopus

1.School of Marine Sciences,Sun Yat-sen University,Zhuhai,519082,China
2.Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai),Zhuhai,519082,China
3.Shenzhen Key Laboratory of Marine Archaea Geo-Omics,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Ocean Science & Engineering,Southern University of Science and Technology,Shenzhen,518055,China
5.Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou),Guangzhou,510000,China

Li，Minchun,Xie，Wei,Li，Penghui,et al. Establishing a terrestrial proxy based on fluorescent dissolved organic matter from sediment pore waters in the East China Sea[J]. WATER RESEARCH,2020,182.

Li，Minchun,Xie，Wei,Li，Penghui,Yin，Kedong,&Zhang，Chuanlun.(2020).Establishing a terrestrial proxy based on fluorescent dissolved organic matter from sediment pore waters in the East China Sea.WATER RESEARCH,182.

Li，Minchun,et al."Establishing a terrestrial proxy based on fluorescent dissolved organic matter from sediment pore waters in the East China Sea".WATER RESEARCH 182(2020).