

FOLLOWUS
1.Institute of Marine Geology and Resources, Ocean College, Zhejiang University, Zhoushan 316021, China
2.Ministry of Water Resources of the People's Republic of China, Beijing 100054, China
3.Key Laboratory of Marine Ecosystem Dynamics, Second Institute of Oceanography, Ministry of Natural Resources, Hangzhou 310012, China
4.Department of Oceanography, Sun Yat-sen University, Kaohsiung 80424, China
zilongli@zju.edu.cn
psloh@zju.edu.cn
Received:21 November 2022,
Online First:20 July 2023,
Published:01 May 2024
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HUANG Dongqin,LI Xiaolong,LI Zilong,et al.Biogeochemistry of sedimentary organic matter in the Yongjiang River estuary in the southern part of Hangzhou Bay, China, since the Late Pleistocene[J].Journal of Oceanology and Limnology,2024,42(03):772-786.
A sediment core (YJK19-02) collected from the southern outlet of Hangzhou Bay near the Yongjiang River estuary in East China was analyzed for grain size
lignin
bulk elemental composition
stable carbon isotope
and rare earth elements (REEs) to determine the sources and diagenesis of sedimentary organic matter (OM) of the estuary and adjacent areas since the Late Pleistocene. δ
13
C values (24.80‰–23.60‰)
total organic carbon/total nitrogen (TOC/TN) molar ratios (8.00–12.14)
and light rare earth el
ement/heavy rare earth element ratios (LREE/HREE=8.34–8.91) revealed the predominance of terrestrial sources of OM
mainly from the Changjiang (Yangtze) River. The lignin parameters of syringyl/vanillyl (S/V=0.20–0.73) and cinnamyl/vanillyl (C/V=0.03–0.19) ratios indicate the predominance of nonwoody angiosperms
and the vanillic acid/vanillin ratios [(Ad/Al)
V
=0.32–1.57
]
indicate medium to high degrees of lignin degradation. An increasing trend of
Λ
(total lignin in mg/100-mg OC) values from ca. 14 500 a BP to ca. 11 000 a BP reflected the increase in temperature during the Late Pleistocene. However
a time lag effect of temperature on vegetation abundance was also revealed. The relatively higher and stable
Λ
values correspond to the higher temperature during the mid-Holocene from ca. 8 500 a BP to ca. 4 500 a BP.
Λ
values decreased from ca. 4 000 a BP to the present
corresponding to historical temperature fluctuations during this time. Our results show that the vegetation abundance in the Yongjiang River Basin since the Late Pleistocene was related to the temperature fluctuation duo to climate change.
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