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Differential response of carbon cycling to long-term nutrient input and altered hydrological conditions in a continental Canadian peatland

Peatlands play an important role in global carbon cycling, but their responses to long-term anthropogenically changed hydrologic conditions and nutrient infiltration are not well known. While experimental manipulation studies, e.g., fertilization or water table manipulations, exist on the plot scale, only few studies have addressed such factors under in situ conditions. Therefore, an ecological gradient from the center to the periphery of a continental Canadian peatland bordering a eutrophic water reservoir, as reflected by increasing nutrient input, enhanced water level fluctuations, and increasing coverage of vascular plants, was used for a case study of carbon cycling along a sequence of four differently altered sites. We monitored carbon dioxide (CO2) and methane (CH4) surface fluxes and dissolved inorganic carbon (DIC) and CH4 concentrations in peat profiles from April 2014 through September 2015. Moreover, we studied bulk peat and pore-water quality and we applied 13C–CH4 and 13C–CO2 stable isotope abundance analyses to examine dominant CH4 production and emission pathways during the growing season of 2015. Our study  illustrates accelerated carbon cycling in a strongly altered peatland with consequences for CO2 and CH4 budgets. However, our results suggest that long-term excess nutrient input does not necessarily lead to a loss of the peatland carbon sink function.

Titel: Differential response of carbon cycling to long-term nutrient input and altered hydrological conditions in a continental Canadian peatland
Verfasser: Berger, Sina GND
Praetzel, Leandra GND
Goebel, Marie
Blodau, Christian
Knorr, Klaus-Holger GND
Dokumenttyp: Artikel
Medientyp: Text
Erscheinungsdatum: 12.02.2018
Publikation in MIAMI: 14.02.2018
Datum der letzten Änderung: 14.02.2018
Quelle: Biogeosciences 15 (2018) 3, 885-903
Schlagwörter: Moore; Methan; Treibhausgase; Nährstoffe; Kanada
Peatlands; methane; greenhouse gases; nutrients; Canada
Fachgebiete: Geowissenschaften, Geologie
Lizenz: CC BY 3.0 DE
Sprache: Englisch
Format: PDF-Dokument
URN: urn:nbn:de:hbz:6-59159527681
Permalink: https://nbn-resolving.org/urn:nbn:de:hbz:6-59159527681
DOI: 10.5194/bg-15-885-2018
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