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The role of ground vegetation in the uptake of mercury and methylmercury in a forest ecosystem

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Schwesig, David ; Krebs, Ortrun:
The role of ground vegetation in the uptake of mercury and methylmercury in a forest ecosystem.
In: Plant and Soil. Bd. 253 (2003) Heft 2 . - S. 445-455.
ISSN 1573-5036
DOI: https://doi.org/10.1023/A:1024891014028

Abstract

Litterfall fromtrees has been identified as an important pathway for deposition of mercury (Hg) and methylmercury (MeHg) in forested catchments, but very little is known about the role of ground vegetation in deposition andcycling of Hg compounds. This study was conducted to identify the origin of Hg compounds in the groundvegetation, and to estimate the role of its litterfall with respect to pools and fluxes of Hg in a coniferous forestin the German Fichtelgebirge mountains. Above and below ground biomass of the dominant ground vegetation(Vaccinium myrtillus, Deschampsia flexuosa and Calamagrostis villosa) were sampled at several plots successively during the growing season. The fluxes to the soil via litterfall of the ground vegetation were calculated using contents of Hg and MeHg in the annual fractions of aboveground biomass. With fluxes of 0.4 – 7.8 mg Hgtotal ha−1 a−1 and 0.01 – 0.04 mg MeHg ha−1 a−1 (depending on the plant species) this pathway contributes only a few percent to the total deposition of both compounds in the catchment. To identify the uptake pathways of Hg compounds, the same plant species were grown in a pot experiment with addition of isotope labelled Hg compounds(202Hg2+, Me198Hg) to a clean sand substrate. Only small proportions of 202Hg and Me198Hg in the substrate weretaken up by the plants, but in all cases the proportion translocated into aboveground biomass after uptake wasgreater in case of Me198Hg. Thus, internal recycling in the plant-soil system is a source especially forMeHg in theground vegetation. However, as compared to the input of Hg compounds by tree litterfall and storage in the forestfloor, Hgtotal and MeHg in ground vegetation are of minor importance. High volatilization of added Hg isotopesraises the question of a re-emission of Hg compounds by the transpiration flux of the ground vegetation.

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Publikationsform: Artikel in einer Zeitschrift
Begutachteter Beitrag: Ja
Zusätzliche Informationen: BAYCEER9548
Institutionen der Universität: Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Bodenökologie
Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER
Fakultäten
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften
Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften
Forschungseinrichtungen
Forschungseinrichtungen > Forschungszentren
Titel an der UBT entstanden: Ja
Themengebiete aus DDC: 500 Naturwissenschaften und Mathematik
Eingestellt am: 09 Okt 2015 05:56
Letzte Änderung: 09 Okt 2015 05:56
URI: https://eref.uni-bayreuth.de/id/eprint/20252