Response of high-resolution heavy metals records to human activities after considering the influence of early diagenesis in the East China Sea over the last 70 years

IF 2.2 3区地球科学 Q2 OCEANOGRAPHY

Continental Shelf Research Pub Date : 2026-04-01 Epub Date: 2026-01-02 DOI:10.1016/j.csr.2026.105638

Xiaolin Ren , Dejiang Fan , Judong Mao , Peng Cheng , Xin Zhang , Xueshi Sun

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Abstract

The records of heavy metals in sediments have been widely used as an indicator for reconstructing human activities, whereas whether early diagenesis influenced the heavy metal records remained uncertain. This study was based on the collection of sediment core from the East China Sea to identify the influence of early diagenesis on heavy metals in sediments through a contrast of heavy metals in sediments (HM_sed) and porewater (HM_pw), to explore the response of the heavy metal records to human activities in the last hundred years. The results demonstrated that the physicochemical conditions (grain size, Eh, pH) of the core were relatively stable and that HM_pw were primarily influenced by the degradation of organic matter and the reduction of iron (Fe) and manganese (Mn) oxides. The comparison between HM_pw and HM_sed indicated that the exchange of heavy metals between sediments and porewater was insignificant to HM_sed. The linear regression of aluminum (Al) to heavy metals (zinc, arsenic, and lead) allowed for the quantitative distinction of the contributions of natural and anthropogenic sources. Since 1950, anthropogenic heavy metals have increased rapidly, with significant phased changes. They are closely related to the percentage of secondary industry value in GDP. This study demonstrates that early diagenesis has a negligible effect on HM_sed and the secondary industry percentage is a comprehensive indicator to reflect anthropogenic heavy metals’ release.

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70年来考虑早期成岩作用影响的东海高分辨率重金属记录对人类活动的响应

沉积物中重金属记录已被广泛用作重建人类活动的指标，但早期成岩作用是否影响重金属记录仍不确定。本研究以东海沉积物岩心采集为基础，通过对比沉积物中重金属（HMsed）和孔隙水（HMpw），确定早期成岩作用对沉积物中重金属的影响，探讨近百年来重金属记录对人类活动的响应。结果表明，岩心的理化条件（粒径、Eh、pH）相对稳定，HMpw主要受有机物降解和铁、锰氧化物还原的影响。HMpw与HMsed的比较表明，沉积物与孔隙水之间的重金属交换对HMsed影响不显著。铝（Al）对重金属（锌、砷和铅）的线性回归允许对自然和人为来源的贡献进行定量区分。自1950年以来，人为重金属快速增加，并有明显的阶段性变化。它们与第二产业产值占GDP的比重密切相关。研究表明，早期成岩作用对重金属释放的影响可以忽略不计，第二产业百分比是反映人为重金属释放的综合指标。

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来源期刊

Continental Shelf Research 地学-海洋学

CiteScore

4.30

自引率

4.30%

发文量

136

审稿时长

6.1 months

期刊介绍： Continental Shelf Research publishes articles dealing with the biological, chemical, geological and physical oceanography of the shallow marine environment, from coastal and estuarine waters out to the shelf break. The continental shelf is a critical environment within the land-ocean continuum, and many processes, functions and problems in the continental shelf are driven by terrestrial inputs transported through the rivers and estuaries to the coastal and continental shelf areas. Manuscripts that deal with these topics must make a clear link to the continental shelf. Examples of research areas include: Physical sedimentology and geomorphology Geochemistry of the coastal ocean (inorganic and organic) Marine environment and anthropogenic effects Interaction of physical dynamics with natural and manmade shoreline features Benthic, phytoplankton and zooplankton ecology Coastal water and sediment quality, and ecosystem health Benthic-pelagic coupling (physical and biogeochemical) Interactions between physical dynamics (waves, currents, mixing, etc.) and biogeochemical cycles Estuarine, coastal and shelf sea modelling and process studies.