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Impacts of anthropogenic forcing on source variability of sedimentary organic matter in the Yellow River estuary over the past 60 years.

Abstract：

:To evaluate changes in the source of sedimentary organic matter (OM) in the Yellow River estuary, a sediment core collected in eastern Laizhou Bay was analyzed for total organic carbon (TOC), stable carbon isotopes of TOC, and biomarkers. The results showed a decreasing trend in terrestrial OM (TOM), but an increasing trend in marine OM (MOM) over the past 60 years. TOM was subdivided into soil OM and plant OM in a three end-member mixing model. The soil OM gradually decreased over the past 60 years, with a significant decline since the 1980s, while the plant OM gradually increased. This reveals that the reduction in TOM was caused mainly by the decreased input of soil OM. The reduced TOM contribution can be attributed primarily to dam construction and a decline in precipitation, whereas the elevated MOM contribution was caused by enhanced marine productivity driven by a rise in nutrient inputs.

journal_name

Mar Pollut Bull

journal_title

Marine pollution bulletin

authors

Xiao R,Wu X,Du J,Deng B,Xing L

doi

10.1016/j.marpolbul.2019.110818

subject

Has Abstract

pub_date

2020-02-01 00:00:00

pages

110818

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(19)30974-9

journal_volume

151

pub_type

杂志文章

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