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Prediction of Holocene Mercury Accumulation Trends by Combining Palynological and Geochemical Records of Lake Sediments (Black Forest, Germany)

机译：利用湖泊沉积物的Palynological和地球化学记录来预测全茂汞累积趋势（黑森林，德国）

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摘要

Forest vegetation plays a key role in the cycling of mercury (Hg) and organic matter (OM) in terrestrial ecosystems. Litterfall has been indicated as the major transport vector of atmospheric Hg to forest soils, which is eventually transported and stored in the sediments of forest lakes. Hence, it is important to understand how changes in forest vegetation affect Hg in soil and its biogeochemical cycling in lake systems. We investigated the pollen records and the geochemical compositions of sediments from two lakes (Schurmsee and Glaswaldsee) in the Black Forest (Germany) to evaluate whether long-term shifts in forest vegetation induced by climate or land use influenced Hg accumulation in the lakes. We were particularly interested to determine whether coniferous forests were associated with a larger export of Hg to aquatic systems than deciduous forests. Principal components analysis followed by principal component regression enabled us to describe the evolution of the weight of the latent processes determining the accumulation of Hg over time. Our results emphasize that the in-lake uptake of Hg during warm climate periods, soil erosion after deforestation and emissions from mining and other human activities triggered changes in Hg accumulation during the Holocene stronger than the changes caused by forest vegetation alone.
机译：森林植被在陆地生态系统中的汞（Hg）和有机物质（OM）循环中起着关键作用。已经表明了落叶的大气HG对森林土壤的主要运输载体，最终被运输并储存在森林湖泊的沉积物中。因此，重要的是要了解森林植被如何影响土壤中的Hg及其在湖泊系统中的生物地球化学循环。我们调查了在黑森林（德国）的两湖（Schurmsee和Glaswaldsee）的花粉记录和地球化学组成，以评估气候或土地利用造成的森林植被中的长期变化是否影响了湖泊中的HG积累。我们特别有兴趣确定针叶林是否与水生系统的较大出口与落叶林有关。主要成分分析随后是主成分回归使我们能够描述确定HG随时间累积的潜在过程重量的演变。我们的成果强调，在温暖的气候期间，湖泊的湖泊的摄取，砍伐森林和其他人类活动的砍伐和排放后的土壤侵蚀，比单独森林植被造成的变化强烈地引发了HG积累的变化。

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