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首页> 外文期刊>Geosciences >Prediction of Holocene Mercury Accumulation Trends by Combining Palynological and Geochemical Records of Lake Sediments (Black Forest, Germany)
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Prediction of Holocene Mercury Accumulation Trends by Combining Palynological and Geochemical Records of Lake Sediments (Black Forest, Germany)

机译：结合湖泊沉积物的孢粉和地球化学记录预测全新世汞的累积趋势（德国黑森林）

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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（OM）循环中起着关键作用。凋落物已被指示为大气中汞向森林土壤的主要运输媒介，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的变化如何影响土壤中的汞及其在湖泊系统中的生物地球化学循环。我们调查了黑森林（德国）中两个湖泊（舒尔姆湖和格拉斯瓦尔德湖）的花粉记录和沉积物的地球化学组成，以评估气候或土地利用引起的森林植被的长期变化是否影响了湖泊中的汞积累。我们特别感兴趣的是要确定针叶林是否与落叶林相比，汞向水生系统的出口量更大。主成分分析和主成分回归分析使我们能够描述潜在过程重量的演变，这些过程决定了汞随时间的积累。我们的研究结果强调，在温暖的气候时期湖中汞的吸收，森林砍伐后的土壤侵蚀以及采矿和其他人类活动的排放触发的全新世时期汞积累的变化比仅由森林植被引起的变化更强烈。

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