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Peatlands in a eutrophic world : Assessing the state of a poor fen-bog transition in southern Ontario, Canada, after long term nutrient input and altered hydrological conditions

Title data

Berger, Sina ; Gebauer, Gerhard ; Blodau, Christian ; Knorr, Klaus-Holger:
Peatlands in a eutrophic world : Assessing the state of a poor fen-bog transition in southern Ontario, Canada, after long term nutrient input and altered hydrological conditions.
In: Soil Biology & Biochemistry. Vol. 114 (November 2017) . - pp. 131-144.
ISSN 0038-0717
DOI: https://doi.org/10.1016/j.soilbio.2017.07.011

Abstract in another language

Excessive nutrient supply may threaten the carbon storage function of nutrient limited peatlands. We conducted a detailed study in a bog ecosystem (Wylde Lake peatland, Canada), which was once ombrotrophic and since AD 1954 borders a water reservoir, which is enriched with nutrients. Our objective was to elucidate whether the inner peatland parts maintain typical characteristics of a pristine bog. To achieve this goal, along a transect of study sites, we dated peat cores, determined nutrient concentrations and N input and mapped the vegetation. The peatland's central part showed large N input rates of ~4.3 g N m-2 y-1, but even greater rates of 5.90 ± 0.10 g N m-2 y-1, were found in the pe-riphery. Elements essential for plant growth, such as N, P, S, Ca, Mg, Mn, Fe, Cu and Zn were increased in concentration upwards in the profile of all peat cores, especially near the reservoir, presumably due to supply by the reservoir water. Also, a more graminoid dominated vegetation near the reservoir indicated a transformation of the once ombrotrophic bog into a poor fen. To our surprise and in contrast to pre-vious studies the peatland did not seem to decay after long-term excessive nutrient load, instead it accelerated peat accumulation, leading to maximum growth rates of up to 500 g C m-2 y-1 immediately after flooding of the reservoir. Peatland functioning in terms of carbon storage appeared maintained.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER141664
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 04 Jan 2018 09:33
Last Modified: 04 Jan 2018 09:33
URI: https://eref.uni-bayreuth.de/id/eprint/41150