Acidity patterns in Swedish forest soils - regional patterns and implications for forest liming
1988
Nilsson, S.I. (Sveriges Lantbruksuniv., Uppsala (Sweden). Inst. foer Ekologi och Miljoevaard)
The chemical status within a subset of Swedish forest soils representing Spodosols and acid Entisols and Inceptisols at mesic sites is reported. Three regions which differ in climate and deposition, southwestern (SW), southeastern (SE) and northern (N) Sweden are compared. Most of the soils are located on acid siliceous bedrock. The three regions differ in the percentage of sample plots where the value of a given variable exceeds the mean calculated for the whole country. The order of decreasing frequency in the 0 and B horizons is N greater than SE greater than SW for base saturation, calcium saturation and magnesium saturation, and N greater than SW greater than SE for potassium saturation. For aluminium saturation the order is SW=SE greater than N in the 0 horizon and SE greater than SW greater than N in the B horizon. The regional difference is especially pronounced with respect to the calcium saturation in the B horizon. The percentage figure is 13, 37 and 45 in SW, SE and N respectively. 33 and 38 % of the sample-plots in SE and N respectively have a calcium saturation less than 1 % of CEC, the corresponding figure for SW being 73 %. Different liming criteria and the possible need for forest liming are discussed.
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