Persistent impact of human activities on trace metals in the Yangtze River Estuary and the East China Sea: Evidence from sedimentary records of the last 60 years 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Science of the Total Environment
年/卷/期
2019 / 654 /
页码
878-889
ISSN号
0048-9697
作者单位
Ocean Univ China, MOE, Key Lab Submarine Geosci & Technol, Qingdao 266100, Peoples R China;Ocean Univ China, MOE, Key Lab Submarine Geosci & Technol, Qingdao 266100, Peoples R China;Ocean Univ China, MOE, Key Lab Submarine Geosci & Technol, Qingdao 266100, Peoples R China;Ocean Univ China, MOE, Key Lab Submarine Geosci & Technol, Qingdao 266100, Peoples R China;Ocean Univ China, MOE, Key Lab Submarine Geosci & Technol, Qingdao 266100, Peoples R China;
作者
Tian, Yuan;Sun, Xueshi;Fan, Dejiang;Liu, Ming;Liao, Huijie;
摘要
Three sediment cores taken from the Yangtze River Estuary (YRE) and the East China Sea (ECS) in 2016 were analyzed for trace metals (Pb, Zn, Cu, Cr and As), major elements (Al, Fe and Mn), sediment composition, chemical properties (Eh and pH), and natural/artificial radionuclides (Pb-210/Cs-137) to decipher the high-resolution historical variation in anthropogenic metals over the past 60 years. The results showed that anthropogenic Pb was primarily derived from atmospheric deposition, while anthropogenic Zn, Cu and As were carried out by fluvial discharge. In the YRE, the recent decrease in sedimentary metals could be largely a result of intensified erosion, which was triggered by the construction of dams in particular the Three Gorges Dam (TGD) in 2003 and soilconservation projects. In comparison, sedimentary records in the deposition-dominated environment of the ECS showed that anthropogenic Pb and Cr began to gradually increase following 1970, but a remarkable increase in anthropogenic Zn and Cu occurred in 1990, probably reflect the different origins and dispersion pathways of these elements. Anthropogenic Pb and Cr exhibited a sharp decrease near early 2000s due to increasing investment in treating pollution. Being sensitive to the substantial reduction in riverine particulate flux of Zn and Cu from the Yangtze River, the concentrations of anthropogenic Zn and Cu in the cores decreased by 5-27% in 2005-2016. Furthermore, a prominent increase trend of As record after 1990, probably due to the excessive pesticides used in agricultural activity. (C) 2018 Elsevier B.V. All rights reserved.
机翻摘要
暂无翻译结果,您可以尝试点击头部的翻译按钮。
关键词/主题词
Sedimentary record;Anthropogenic metals;Human activities;Fast China Sea;
若您需要申请原文,请登录。

最新评论

暂无评论。

登录后可以发表评论

意见反馈
返回顶部