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Enhanced silicon availability leads to increased methane production, nutrient and toxicant mobility in peatlands

Title data

Reithmaier, Gloria ; Knorr, Klaus-Holger ; Arnhold, Sebastian ; Planer-Friedrich, Britta ; Schaller, Jörg:
Enhanced silicon availability leads to increased methane production, nutrient and toxicant mobility in peatlands.
In: Scientific Reports. Vol. 7 (2017) Issue 1 . - No. 8728.
ISSN 2045-2322
DOI: https://doi.org/10.1038/s41598-017-09130-3

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Abstract in another language

Peatlands perform important ecosystem functions, such as carbon storage and  nutrient retention, which are affected, among other factors, by vegetation and peat decomposition. The availability of silicon (Si) in peatlands differs strongly, ranging from -1. Since decomposition of organic material was recently shown to be accelerated by Si, the aim of this study was to examine how Si influences decomposition of carbon and nutrient and toxicant mobilization in peatlands. We selected a fen site in Northern Bavaria with naturally bioavailable Si pore water concentrations of 5 mg/L and conducted a Si addition experiment. At a fourfold higher Si availability, dissolved organic carbon, carbon dioxide, and methane concentrations increased significantly. Furthermore, dissolved nitrogen, phosphorus, iron, manganese, cobalt, zinc, and arsenic concentrations were significantly higher under high Si availability. This enhanced mobilization may result from Si competing for binding sites but also from stronger reducing conditions, caused by accelerated respiration. The stronger reducing conditions also increased reduction of arsenate to arsenite and thus the mobility of this toxicant. Hence, higher Si availability is suggested to decrease carbon storage and increase nutrient and toxicant mobility in peatland ecosystems.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER141635
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Professorship Environmental Geochemistry Group > Professorship Environmental Geochemistry - Univ.-Prof. Dr. Britta Planer-Friedrich
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 10 Jan 2018 08:43
Last Modified: 20 Aug 2018 09:39
URI: https://eref.uni-bayreuth.de/id/eprint/41244