Site Characteristics of Scots Pine Stands Infected by Gremmeniella abietina in Central Finland : I. Mineral Soil Sites

Helsinki

1990

27 S.

11 Abb., 8 Tab., zahlr. Lit. Ang.

Bandaufführung

2623

36957

Mineral soil sites where Scots pine (Pinus sylvestris) were suffering from Gremmeniella abietina die-back were characterized and classified in Central Finland. The tree stand, ground vegetation, soil type and site topography were described on 163 sample plots in 16 stands. The sites were classified according to the Cajander forest classification system and also numerically, using Twinspan analysis based on the ground vegetation. The site topography of severely damaged stands was checked from colour infrared aerial photographs. The disease was most severe in depressions and frost pockets. Apart from topography no significant correlations were found between disease severity and site factors. No typical vegetational pattern or forest site type of the severely affected stands could by detected. Most of the stands were growing on medium-coarse, unfertile soil with a rather thick humus layer.