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DIVISION S-7—FOREST & RANGE SOILS

Nitrous Oxide Emission and Methane Consumption Following Compaction of Forest Soils

^a Institute of Soil Science and Forest Nutrition, Univ. of Göttingen, Büsgenweg 2, 37077 Göttingen, Germany
^b Dep. of Environmental Chemistry, Univ. of Kassel, Nordbahnhofstr. 1a, 37213 Witzenhausen, Germany

^* Corresponding author (rteepe{at}gwdg.de).

Fluxes of the greenhouse gases, N₂O and CH₄, were measured across a skid trail at three beech (Fagus sylvatica L.) forest sites with soils of different texture. At each site three skid trails were established by applying two passes with a forwarder. Soil compaction in the middle of the wheel track caused a considerable increase of N₂O emissions with values elevated by up to 40 times the uncompacted ones. Compaction reduced the CH₄ consumption at all sites by up to 90%, and at the silty clay loam site its effect was such that CH₄ was even released. These changes in N₂O and CH₄ fluxes were caused by a reduction in macropore volume and an increase of the water-filled pore space (WFPS). Additionally, the slipping of the forwarder's wheels led to a mixing of the humus layer with the mineral soil, which resulted in a new layer. This layer reduced gas exchange between the soil and the atmosphere. Trace gas fluxes were altered in the trafficked soil and in the adjacent areas. Despite the significant changes in the trace gas fluxes on the skid trails, the cumulative effect of the two gases on the atmosphere was small with respect to total emissions. However, if soil trafficking is not restricted to the established skid trail system the area of compaction and consequently the atmospheric load by greenhouse gases may increase with every harvesting operation.

Abbreviations: GWP, global warming potential • TS_M, compacted soil in the middle of the trafficked soil • TS_B, compacted soil at the border of the trafficked soil • US_M, uncompacted soil between the two wheel tracks (middle of the skid trail) • US_B, uncompacted soil at the border of the trafficked soil • WFPS, water-filled pore space

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