A large artificial dyke greatly alters partitioning of sulfate and iron reduction and resultant phosphorus dynamics in sediments of the Yeongsan River estuary, Yellow Sea SCIE SCOPUS

Cited 8 time in WEB OF SCIENCE Cited 10 time in Scopus
Title
A large artificial dyke greatly alters partitioning of sulfate and iron reduction and resultant phosphorus dynamics in sediments of the Yeongsan River estuary, Yellow Sea
Author(s)
An, Sung-Uk; Mok, Jin-Sook; Kim, Sung-Han; Choi, Jae-Hoon; Hyun, Jung-Ho
KIOST Author(s)
Kim, Sung Han(김성한)
Publication Year
2019-05-15
Abstract
We investigated sediment geochemistry, partitioning of organic carbon (C-org) oxidation by iron reduction (FeR) and sulfate reduction (SR), and benthic phosphorus (P) release, togetherwith the P speciation in the sediments to elucidate the P dynamics in two contrasting sediments (i.e., estuarine vs. limnetic) separated by a large dyke in the Yeongsan River estuary of the Yellow Sea. In the sediments of the Yeongsan River estuary (St. YE), SR dominated the C-org oxidation pathway, accounting for 81.7% of total anaerobic C-org oxidation. Under the SR-dominated condition, H2S derived from SR reacts quickly with iron oxides to form iron sulfides, which ultimately release the P bound to Fe(III) into the pore water. The enhanced benthic P flux (0.24 mmol m(-2) d(-1)) at the YE site accounted for 80% of the P required for primary production in the water column. In contrast, in the limnetic sediments of the Yeongsan Lake (St. YL), where high levels of CH4 accumulated, most P was bound to Fe and Al, which resulted in a low benthic P flux (0.03 mmol m(-2) d(-1)). The results suggest that the frequent discharge of relatively P-depleted freshwater into the estuary via the artificial dyke may result in relatively P-limiting conditions in estuarine ecosystems. As a result, benthic P release from the SR-dominated estuarine sediment is a significant internal source of P in the coastal ecosystem. Our results indicate that the construction of a large dyke at a river mouth greatly alters C-org oxidation pathways and P dynamics in coastal ecosystems. (c) 2019 Elsevier B.V. All rights reserved.
ISSN
0048-9697
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/629
DOI
10.1016/j.scitotenv.2019.02.058
Bibliographic Citation
SCIENCE OF THE TOTAL ENVIRONMENT, v.665, pp.752 - 761, 2019
Publisher
ELSEVIER SCIENCE BV
Subject
CONTINENTAL-MARGIN SEDIMENTS; ORGANIC-CARBON OXIDATION; BENTHIC NUTRIENT FLUX; FRESH-WATER; MARINE-SEDIMENTS; COASTAL; RELEASE; OXYGEN; METHANOGENESIS; AVAILABILITY
Keywords
P dynamics; Sulfate reduction; Iron reduction; Benthic P flux; Benthic-pelagic coupling; Yeongsan River dyke
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER SCIENCE BV
Related Researcher
Research Interests

Marine chemistry,Benthic biogeochemistry,Microbial ecology,해양화학,퇴적물 생지화학,미생물 생태학

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