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Catchment soils as a factor of trace metal accumulation in sediments of the reservoir Klingenberg(eastern Ore Mountains, Germany)

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Journal of Environmental Sciences 2019年第12期31卷 1-14页

作者： jens hahn Christian Opp Raphael Ganzenmuller Anntke Ewert Birgit Schneider Nina Zitzer Gabriela Laufenberg Philipps-University of Marburg Working Group for Hydro-and Soil GeographyDeutschhausstr.1035037 MarburgGermany University of Leipzig Institute of GeographyPhysical GeographyJohannisallee 19a04103 LeipzigGermany Philipps-Uniuersity o/Marbitrg Mass SpectrometryMarbacher Weg 6-1035037 MarburgGermany

The release and accumulation dynamics of trace metals in soils and aquatic sediments were exemplarily investigated in the catchment area of the Reservoir Klingenberg(Germany).Catchment soils were examined for mobilizable and total concentrations of arsenic(As),cadmium(Cd),chrome(Cr),iron(Fe),manganese(Mn),nickel(Ni),lead(Pb),and zinc(Zn)and compared with trace metal quantities accumulated in riverbed and reservoir *** comparison of all samples showed relatively small variations of Cr(7.96–46.0 mg/kg),Fe(7.79–40.4 g/kg),and Ni(6.06–56.5 mg/kg),while stronger differences were found for As(11.2–164 mg/kg),Cd(0.14–30.5 mg/kg),Mn(0.08–1.84 g/kg),Pb(20.7–183 mg/kg),and Zn(69.1–916 mg/kg).The catchment soils were slightly enriched by Cd,Pb,and *** Cd and Zn were characterized by large mobilizable *** mean trace metal concentrations in riverbed sediments were higher than in catchment soils,while reservoir sediments accumulated the highest amounts of the analyzed *** enrichment of trace metals in reservoir sediments was generally determined by the sedimentation of fine particles,while the distribution of As,Fe,and Mn was additionally impacted by redox *** Cd and Zn,which in comparison were most enriched in riverbed and reservoir sediments,a significant release from soils by leaching processes was *** accumulation of As and Pb in reservoir sediments was influenced to a greater extent by soil erosion and by anthropogenic or chalcogen sources in the catchment.

关键词： Trace metals Exchangeable forms Soil Sediment Catchment Sources

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Heavy Metal Concentrations in Pores and Surface Waters during the Emptying of a Small Reservoir

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Journal of Geoscience and Environment Protection 2015年第10期3卷 66-72页

作者： Christian Opp jens hahn Nina Zitzer Gabriela Laufenberg Department of Hydrology and Soil Science Faculty of Geography University of Marburg Marburg Germany Department of Geography Faculty of Mathematic and Natural Science University of Koblenz-Landau Koblenz Germany Mass Spectrometry Faculty of Pharmacy University of Marburg Marburg Germany

The impact of reservoir emptying on the concentrations of dissolved heavy metals (As, Cd, Cr, Cu, Fe, Mn, Ni, Pb and Zn) in pore and surface waters was studied in the Aar Reservoir, a small reservoir in central Germany, during and after the emptying process. This study was conducted to observe binding changes within pore waters as well as the input of dissolved heavy metals in waters of the Aar Creek, what becomes possible when the reservoirs water table is removed and lake sediments become exposed. In pore waters, no clear shifting tendencies between dissolved and sorbed heavy metal fractions could be found after the completed sediment exposure. These relatively low dynamics in pore waters can be explained by the fine texture of the lake sediments, which are characterized by a high water holding capacity, what led to high remaining water contents and therefore slowed down the redox changes. A few days after the completed emptying, a general increase of dissolved heavy metal concentrations occurred in running waters of the Aar Creek as a result of pore water drainage. Here, element specific differences in mobilization and transportation abilities were found, what can be reconstructed by the ratio of dissolved heavy metals in pore and surface waters.

关键词： Heavy Metals Reservoirs Sediments Surface Waters

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A new endophytic insect-associated Daldinia species, recognised from a comparison of secondary metabolite profiles and molecular phylogeny

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Fungal Diversity 2013年第3期60卷 107-123页

作者： Sylvie Pažoutová Stefanie Follert jens Bitzer Matthias Keck Frank Surup PetrŠrůtka Jaroslav Holuša Marc Stadler Institute of Microbiology of the ASCR v.v.i.Vídeňská108314220 Prague 4Czech Republic Department Microbial Drugs Helmholtz-Zentrum für Infektionsforschung GmbHInhoffenstrasse 738124 BraunschweigGermany IMD Natural Solutions GmbH Otto-Hahn-Strasse 1544227 DortmundGermany Faculty of Forestry and Wood Sciences Czech University of Life SciencesKamýcká12916521 Prague 6Czech Republic

Xylariaceous endophytes are commonly encountered in plants,and it has recently been found out that insect vectors play a major role in their life cycle,as well as in the apparent host-specificity of the fungal *** this study,a new insect-associated,endophytic anamorph species of Daldinia is recognised from a comparison of (a)morphological and ecological data;(b)molecular phylogenetic data based on rDNA,alpha-actin and beta-tubulin genes;and (c)secondary metabolite profiles based on high performance liquid chromatography/diode array/mass spectrometry(HPLC-DAD/MS)and gas chromatography/mass spectrometry(GC-MS)in comparison with authentic strains of Daldinia and other *** new species,Daldinia hawksworthii,is a symbiont of the willow woodwasp,Xiphydria prolongata,which is in turn preferentially associated with Salix.A comparison of HPLCDAD/MS profiles from standardised cultures revealed the presence of a specific compound,which was not encountered in any of the ca.250 Daldinia strains studied for *** compound was isolated after fermentation of the fungus in 10 l scale by preparative *** elucidation by NMR spectroscopy revealed a novel pyrone,for which the name dalsymbiopyrone is *** compound showed weak antimicrobial and cytotoxic effects and might be a signal molecule involved in the trilateral ecological interaction between the host plant,the insect,and its fungal symbiont.

关键词： Fungi Endophytes Evolution Xylariales Bioactive metabolites Natural products Alpha-pyrones

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