%0 Article
%T Podzolization as studied from terraces of various ages in two river valleys, Northern Finland.
%A Koutaniemi, Leo
%A Koponen, Raimo
%A Rajanen, Kyösti
%D 1988
%J Silva Fennica
%V 22
%N 2
%R doi:10.14214/sf.a15502
%U https://silvafennica.fi/article/5345
%X <p>The study was made in the Ivalojoki and Oulankajoki valleys, consisting of terraces of well sorted sandy material aged 9500–300 B.P. The vegetation is characterized by dry and moderately dry forest types with Scots pine (<em>Pinus sylvestris</em> L.) as the dominant tree species. The study included: forest types, particle size and sorting of mineral horizons, thickness of horizons, amount of organic material, pH, electrical conductivity, and NH<sub>4</sub>OAc (pH 4.56) extractable Fe, Al, P, K, Mg, Mn and Zn concentrations. The principal aim was to study the interrelationships between all these properties with special reference to the age of the soil.</p>
<p>The results allowed a distinction to be made between the following categories: (1) features typical of podsolization (e.g. increase in leaching of Fe and Al with age of soil from the A<sub>2</sub>), (2) certain factors showing higher values in the north (Ivalo) than in the south (Oulanka), principally Fe and Mg, (3) declining trends in P, Mg, Mn and Zn concentrations with age, which may partly be due to the geological history, and (4) declining trends in amount of organic material and electrical conductivity with age, these both being factors arising from the geological history rather than from podzolization.</p>
<p>The PDF includes a summary in Finnish.</p>