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Thermal and Aeration Properties of Mor Layers in Finland

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Thermal conductivity (KT), air permeability (Ka) and relative diffusivity of oxygen (ratio of oxygen diffusion coefficient in the soil to the oxygen diffusion coefficient in free air, D/D0) were measured from undisturbed mor samples taken from low-fertility (CT) Scots pine (Pinus sylvestris L.) sites and medium-fertility (MT) Norway spruce (Picea abies (L.) Karst.) sites. K T was determined with respect to matric potential (), whereas Ka and D/D0 were determined as a function of air-filled porosity (A). K T() and D / D 0(A) were slightly greater on the MT sites than on the CT sites, whereas Ka(A) did not differ statistically between the site types studied. KT() and Ka(A) were similar to those values reported in the literature for other organic soils, but D/D0(A) was slightly lower. Among the MT sites, the parameters for the KT(), Ka(A) and D/D0(A) models correlated with the water-retention characteristics. Among the CT sites, the parameters for Ka(A) and D/D0(A) models correlated with bulk density, layer thickness and distance from the nearest trees.
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Document Type: Research Article

Affiliations: Faculty of Forestry, University of Joensuu, P.O. Box 111, FIN-80101, Joensuu, Finland

Publication date: 2000-11-16

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