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Conversion of biomass to charcoal and the carbon mass balance from a slash-and-burn experiment in a temperate deciduous forest

University of Zurich, Department of Geography, Winterthurerstrasse 190, 8057 Zurich, Switzerland, eckmeier{at}geo.unizh.ch

Manfred Rösch

Landesamt für Denkmalpflege im Regierungspräsidium Stuttgart, Fischersteig 9, 78343 Gaienhofen-Hemmenhofen, Germany

Otto Ehrmann

Münster 12, 97933 Creglingen, Germany

Michael W.I. Schmidt

University of Zurich, Department of Geography, Winterthurerstrasse 190, 8057 Zurich, Switzerland

Wolfram Schier

Freie Universität Berlin, Institut für Prähistorische Archäologie, Altensteinstrasse 15, 14195 Berlin, Germany

Renate Gerlach

Landschaftsverband Rheinland, Rheinisches Amt für Bodendenkmalpflege, Endenicher Strasse 133, 53115 Bonn, Germany

Anthropogenic burning, including slash-and-burn, was deliberately used in (pre)historic Central Europe. Biomass burning has affected the global carbon cycle since, presumably, the early Holocene. The understanding of processes and rates of charcoal formation in temperate deciduous forests is limited, as is the extent of prehistoric human impact on the environment. We took advantage of an experimental burning to simulate Neolithic slash-and-burn, and we quantified the biomass fuel and charcoal produced, determined the resulting distribution of the charcoal size fractions and calculated the carbon mass balance. Two-thirds of the charcoal particles (6.71 t/ha) were larger than 2000 µm and the spatial distribution of charcoal was highly variable (15—90% per m²). The conversion rate of the biomass fuel to charcoal mass was 4.8%, or 8.1% for the conversion of biomass carbon to charcoal carbon, and 58.4 t C/ha was lost during the fire, presumably as a component of aerosols or gases.

Key Words: Slash-and-burn experiment • temperate deciduous forest • charcoal • carbon mass balance • biomass burning.

The Holocene, Vol. 17, No. 4, 539-542 (2007)
DOI: 10.1177/0959683607077041


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