Zum Tränkverhalten verschiedener Kiefernarten

Lignification and cell wall thickening of ray parenchyma cells in Scots pine sapwood

“…Nakaba et al (2008) reported lignification and cell wall thickening in ray parenchyma cells of Pinus densiflora and Pinus nigra before heartwood formation, and this development started in ray parenchyma cells adjacent to ray tracheids. The appearance of thickened cell walls in ray parenchyma cells in Scots pine sapwood was reported earlier by Bauch et al (1983) and Nyrén and Back (1959). In the sapwood of Radiata pine (Pinus radiata), only 7 % of parenchyma cells lignify before heartwood formation (Bamber et al 1983).…”

“…Tulik et al 2019, and not with sapwood areas close to the bark or earlier in the sapwood. The presence of thick and lignified ray parenchyma cell walls in Scots pine sapwood is noted by Bauch et al (1983), and also Nyrén and Back (1959) described parenchyma cells with thick walls within the non-pit areas alongside thin-walled ones in Northern European pulp fibers. Nyrén and Back (1959) found that 32% of parenchyma cells were thin-walled in sapwood, while a proportion of 20% thin-walled parenchyma cells was found in the heartwood.…”

“…The presence of many thick-walled and lignified ray parenchyma cells early in the sapwood can influence the treatability of Scots pine sapwood with impregnation fluids (Zimmer et al 2014a) since radial flow through the parenchyma cells within the ray would be reduced. Bauch et al (1983) conducted a treatability test with different Pine species and the refractory softwood species Picea abies [Karst.]. P. abies has a ray structure where all ray parenchyma cells are having thickened and lignified cell walls.…”

“…P. abies has a ray structure where all ray parenchyma cells are having thickened and lignified cell walls. In the study of Bauch et al (1983), it was shown that the species with higher proportions of unlignified and thin-walled ray parenchyma cells, in addition to larger cross-field pits, were easier to impregnate. Different patterns of lignification and cell wall thickening can cause variations in the performance of the material in practice and are particularly relevant for impregnation treatments with protection agents.…”

Untersuchung der kapillaren Transportwege im Weißtannenholz

“…Im Gegensatz zu Kiefer, deren heterogene Holzstrahlen einen wesentlichen Beitrag zur radialen Flüssigkeitsbewegung leisten (Buro, Buro 1959;Wardrop, Davies 1961;Bauch et al 1983;Trenard, Gueneau 1984), kommt den homogenen Holzstrahlen der Weißtanne nur eine geringe, lokal sogar keine Bedeutung als Transportwege für Imprägnierflüssigkeiten zu. Dies belegen auch die Befunde von Trenard und Gueneau (1984), die für Tanne nach einer Galliumimprägnierung bei 16 bar neben vollständig gefüllten Tracheiden nur wenige Tropfen des Metalls in den Holzstrahlzellen nachwiesen.…”