首页|Biogeochemistry of sedimentary organic matter in the Yongjiang River estuary in the southern part of Hangzhou Bay,China,since the Late Pleistocene
Biogeochemistry of sedimentary organic matter in the Yongjiang River estuary in the southern part of Hangzhou Bay,China,since the Late Pleistocene
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国家科技期刊平台
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NSTL
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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.δ13C values(-24.80‰--23.60‰),total organic carbon/total nitrogen(TOC/TN)molar ratios(8.00-12.14),and light rare earth element/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(SN=0.20-0.73)and cinnamyl/vanillyl(CN=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 A(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 A values correspond to the higher temperature during the mid-Holocene from ca.8 500 a BP to ca.4 500 a BP.A 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.
Yongjiang River estuarysedimentary organic matterligninenvironmental changeLate Pleistocene
Institute of Marine Geology and Resources,Ocean College,Zhejiang University,Zhoushan 316021,China
Ministry of Water Resources of the People's Republic of China,Beijing 100054,China
Key Laboratory of Marine Ecosystem Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China
Department of Oceanography,Sun Yat-sen University,Kaohsiung 80424,China
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China Institute of Water Resources and Hydropower ResearchWater Conservancy Bureau of Yunyang CountyEcological Forestry Development Center of Lishui CityAsia-Pacific Network for Global Change Research
国家科技期刊平台
NSTL
万方数据
