Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China

Tangrong HE; Fenfen ZHANG; Yali WANG; Xiaogang CHEN; Jinzhou DU

doi:10.1007/s00343-021-0296-6

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Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China

Chemistry | Updated：2023-04-27

- Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China
- Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China
- 海洋湖沼学报（英文） 2022年40卷第1期页码：128-141
- Affiliations：
  
  1.State Key Laboratory of Estuarine and Coastal Research, East China Normal University, Shanghai 200241, China
  2.Institute of Eco-Chongming (IEC), Shanghai 202162, China
  3.Key Laboratory of Coastal Environment and Resources of Zhejiang Province, School of Engineering, Westlake University, Hangzhou 310024, China
- Author bio：
  
  Fenfen ZHANG, E-mail: ffzhang@sklec.ecnu.edu.cn
- Funds：
  
  the Natural Science Foundation of Shanghai(19ZR1415300);the Zhejiang Provincial Natural Science Foundation of China(LQ21D060005);the China Postdoctoral Science Foundation(2020M681931);© Chinese Society for Oceanology and Limnology, Science Press and Springer-Verlag GmbH Germany, part of Springer Nature 2022
- DOI：10.1007/s00343-021-0296-6
  中图分类号：
- 收稿：2020-10-19，
  
  录用：2020-11-24，
  
  网络首发：2021-02-10，
  
  纸质出版：2022-01
- Accepted：
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Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China[J]. 海洋湖沼学报（英文）, 2022,40(1):128-141.

Tangrong HE, Fenfen ZHANG, Yali WANG, et al. Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China[J]. Journal of Oceanology and Limnology, 2022, 40(1): 128-141.
Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China[J]. 海洋湖沼学报（英文）, 2022,40(1):128-141. DOI： 10.1007/s00343-021-0296-6.

Tangrong HE, Fenfen ZHANG, Yali WANG, et al. Characterization of dissolved organic matter in submarine groundwater from a salt marsh in Chongming Island, China[J]. Journal of Oceanology and Limnology, 2022, 40(1): 128-141. DOI： 10.1007/s00343-021-0296-6.

摘要

Abstract

Salt marshes are research hotspots of the carbon cycle in coastal zones because large amounts of atmospheric carbon dioxide is fixed by salt marshes vegetation and stored in its biomass and soil. Dissolved organic carbon (DOC) in submarine groundwater (well water and pore water) in salt marshes plays an important role in advective exchange between the salt marshes and coastal waters. However

the molecular characteristics of DOC in salt marsh groundwater are poorly understood because of the complex DOC structures and hydrodynamic process. In this study

fluorescent components and refractory DOC (RDOC) in submarine groundwater from a salt marsh (Chongming Island

China) and adjacent coastal water were characterized by fluorescence spectroscopy and nuclear magnetic resonance spectroscopy. The fluorescent components identified by parallel factor analysis indicated that humic-like substances dominated the chromophoric dissolved organic matter in the submarine groundwater. The chromophoric dissolved organic matter and dissolved organic matter in the submarine groundwater had non-conservative behaviors because of additions from terrestrial humic substances. The nuclear magnetic resonance spectra indicated that bioactive substances (carbohydrates) contributed only 13.2%–14.8% of the dissolved organic matter in the submarine groundwater but carboxyl-rich alicyclic molecules (CRAMs)

the main components of RDOC

contributed 64.5% of the dissolved organic matter. Carbohydrates and CRAMs contributed 16.4% and 61.7% of the dissolved organic matter in the coastal water

similar to the contributions for submarine groundwater. The DOC concentration in submarine groundwater was 386±294 μmol/L

which was significantly higher than that in coastal water (91±19 μmol/L). The high DOC concentrations and>60% relative RDOC content suggested that submarine groundwater may be an important source of RDOC to coastal seawater. This information will be helpful for estimating the climate effects of salt marsh blue carbon.

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references

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