Thermal and Aeration Properties of Mor Layers in Finland
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