Die Eignung der Hochdruck-Saftverdrängung zum Holzschutz bei waldfrisch behandelten Fichten- und Kiefernpfählen

Abstract

The concentration and radial distribution of copper, chromium, arsenic (CCA), and the depth of radial checking in U.K. grown, field exposed sitka and Norway spruce and Scots and Corsican pine poles treated by high pressure sap-displacement are examined. The concentration of CCA elements at a depth of 10 mm are significantly lower in sitka spruce. Norway spruce has similar concentrations of chromium to Scots and Corsican pine but has significantly lower concentrations of arsenic than both pine species and a lower concentration of copper than Scots pine. The slopes of metal concentration against radial depth are similar in Norway spruce and Scots pine but are significantly larger (steeper) and smaller (less steep) respectively in sitka spruce and Corsican pine. Checking is more severe in sitka spruce than in the other species and penetrates the preservative treated annulus thus greatly facilitating decay since micro-organisms have access to untreated non durable wood. The results suggest that high pressure sap-displacement is suitable for the treatment and protection of Scots and Corsican pine and probably Norway spruce but is madequate for the protection of sitka spruce.