|Table of Contents|

Organic Phosphorus Contents, Total Organic Carbon, Total Nitrogen and Their Isotopic Characteristics from Sediments in Jiangsu Coast, China and Source Identification of Organic Matter(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2024年第01期
Page:
67-80
Research Field:
环境与可持续发展
Publishing date:

Info

Title:
Organic Phosphorus Contents, Total Organic Carbon, Total Nitrogen and Their Isotopic Characteristics from Sediments in Jiangsu Coast, China and Source Identification of Organic Matter
Author(s):
YAN Wei-bing1 RAO Wen-bo2* LI Tian-ning2 XU Zu-yang1 YANG Yu-hang2 MAO Chang-ping2
(1. Geological Exploration Technology Institute of Jiangsu Province, Nanjing 210049, Jiangsu, China; 2. School of Earth Sciences and Engineering, Hohai University, Nanjing 211100, Jiangsu, China)
Keywords:
sediment organic matter organic phosphorus organic carbon total nitrogen stable isotope material source Jiangsu
PACS:
X55; P76
DOI:
10.19814/j.jese.2023.06026
Abstract:
The distribution and source of sediment organic matter are a key and difficult issue in the studies of the sea-land transition biogeochemical cycle and coastal ecological environments, and have been widely concerned. The Jiangsu coast was chosen as a study area, 61 surface sediment samples were collected in 2016, the organic phosphorus(OP)contents, total organic carbon(TOC), total nitrogen(TN), and the isotopic compositions of organic carbon and total nitrogen(δ13Corg, δ15Ntot values)were investigated to identify the sources of organic matter from sediments in Jiangsu coast. The results show that the significant correlations between OP contents, TOC, and TN in sediments and particle sizes, which are significantly influenced by the hydrodynamic effects. The qualitative analysis of the element ratios and isotopes show that the sediment organic matter is mainly provided by marine organisms and is also supplied by terrestrial inputs to some extent. The calculated results of the isotope mixing model further find that the contribution proportion of the marine source to sediment organic matter of Jiangsu coast is averagely 56.9%, followed by terrestrial C3 plants, soil, and agricultural fertilizers with an average contribution proportion of 38.5%, and domestic sewage contributes only 4.6%. Marine organic matter is transported to Jiangsu coast through oceanic currents and tidal waves, and river input and coastal aquaculture might be important patterns of terrestrial input. Terrestrial input is not the main contributor to the organic matter of sediments in Jiangsu coast, but is probably a driving factor for coastal eutrophication. The findings are helpful in deeply understanding the biogeochemistry cycle in the land-sea transition zone, and provide a theoretical guidance for the prevention and control of coastal organic pollution.

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Last Update: 2024-01-25