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首页> 外文期刊>Journal of Paleolimnology >Sedimentary geochemical record of recent environmental changes around Lake Middle Marviken, Sweden
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Sedimentary geochemical record of recent environmental changes around Lake Middle Marviken, Sweden

机译：瑞典中马尔维肯湖附近近期环境变化的沉积地球化学记录

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摘要

Geochemical properties of sediments deposited in Lake Middle Marviken over the last 185 years record the impacts of a succession of environmental changes that have occurred in the watershed. Clear-cutting of forests for wood and charcoal and extensive water harnessing to support the local iron mills from 1897 to 1957 is recorded by low C/N ratios, high black carbon, and low TOC and Ntotal accumulation rates. Larger δ13C and δ15N values in sediments deposited during this period imply higher productivity. Fluctuations in Ntotal and Ptotal accumulation rates show that the lake chemistry has varied between P or N-depleted systems that affected the δ15N values. Organic matter in the sediments is predominantly immature terrestrial material. Furthermore, hydrocarbon CPI, TAR, and Paq values conform with the observed geochemical trends, variations in organic matter sources, and changes in the watershed. Accumulation rates of Cd, Pb, Zn, and S remained mostly unchanged throughout the period of mining, but an increase from 1957 to 1980 is most likely associated with air-borne industrial and fossil fuel emissions from regional urbanization. In situ microbial processes, such as iron and manganese reduction, also appear to be important in carbon cycling and in affecting the sediment and water chemistry of this lake.
机译：在过去的185年中，沉积在中马维肯湖中的沉积物的地球化学特性记录了该流域内一系列环境变化的影响。低碳/氮比，高黑碳，低TOC和Ntotal累积率记录了从1897年到1957年的森林砍伐，木材和木炭砍伐以及广泛的水资源利用以支持当地的钢铁厂。在此期间沉积的沉积物中较大的δ13 C和δ15 N值意味着较高的生产率。 Ntotal 和Ptotal 累积速率的波动表明，在影响δ15 N值的P或N贫化系统之间，湖泊化学变化很大。沉积物中的有机物主要是未成熟的陆地物质。此外，碳氢化合物的CPI，TAR和Paq 值符合观测到的地球化学趋势，有机物来源的变化以及流域的变化。在整个采矿期间，Cd，Pb，Zn和S的积累率基本保持不变，但从1957年到1980年的增长很可能与区域城市化带来的航空工业和化石燃料排放有关。原位微生物过程（例如铁和锰的还原）在碳循环以及影响该湖的沉积物和水化学方面似乎也很重要。

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