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The effect of forest vegetation on the formation of mercury accumulation signals in lake sediments

森林植被对湖泊沉积物汞积累信号形成的影响

基本信息

批准号：
286806412
负责人：
Professor Dr. Harald Biester, Ph.D.
金额：
--
依托单位：
Institut für Ur- und Frühgeschichte und Vorderasiatische Archäologie
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2015
资助国家：
德国
起止时间：
2014-12-31 至 2019-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/286806412?language=en
关键词：
effect forest vegetation formation mercury

项目摘要

The aim of the proposed project is to study how changes in forest vegetation will affect the accumulation of mercury in lake sediments. This approach builds on the hypothesis that different forest vegetation in lake catchments causes different Hg accumulation rates to forest soils. Moreover, forest type affects production, degradation and release of organic matter (OM) from forest soils, and thus also the transport of mercury to lakes. The proposed project will combine the investigation of long (several millennia) sediment records with known vegetation histories (from pollen analyses) taken from four catchment-lake systems, one with deciduous and three with coniferous vegetation. In addition we will investigate the contemporary relation between OM quality and quantity and Hg sedimentation in the study lakes through POM and DOM analyses. As chemical characteristics of organic matter in soils and assumingly also in sediments are strongly influenced by forest vegetation, we will use a qualitative approach where the OM quality (as defined by Fourier-transform infrared spectroscopy and Pyrolysis-GC-MS) will be related to changes in forest vegetation as derived from the tree pollen distribution in the sediments. Moreover, we will use multivariate statistical approaches to disentangle to which extent the influence of changes in forest vegetation on Hg accumulation in the lake sediments can be distinguished from other processes affecting the Hg load. A deeper understanding of this relationship is seen as the basis to predict the release auf Hg from the widely contaminated surface soils in the Northern Hemisphere to aquatic systems under changing land use or climatic conditions.

拟议项目的目的是研究森林植被的变化将如何影响湖泊沉积物中汞的积累。这一方法建立在这样的假设之上，即湖泊流域不同的森林植被对森林土壤的汞积累速率不同。此外，森林类型影响森林土壤有机质(OM)的产生、降解和释放，从而影响汞向湖泊的迁移。拟议的项目将结合对长期(几千年)沉积物记录的调查和已知植被历史(来自花粉分析)，这些历史来自四个集水-湖泊系统，一个是落叶植被，三个是针叶植被。此外，我们还将通过POM和DOM分析来研究研究湖泊中有机质和有机质的数量与汞沉积的当代关系。由于土壤和沉积物中有机质的化学特性受到森林植被的强烈影响，我们将使用定性方法，即有机质质量(由傅立叶变换红外光谱和热解-GC-MS定义)将与森林植被的变化有关，而森林植被的变化来自于沉积物中树木花粉的分布。此外，我们将使用多元统计方法来区分森林植被变化对湖泊沉积物中汞积累的影响与其他影响汞负荷的过程的区别程度。对这种关系的深入了解被视为预测在不断变化的土地利用或气候条件下，北半球被广泛污染的表层土壤向水生系统释放auf Hg的基础。