Variability of Bark Anatomical Characteristics between and within Norway Spruce, Picea abies (L.) Karsten, in Upper Belgium

1989

S. 85-95

6 Abb., 2 Tab., 13 Lit. Ang., Fr, Zfsg. En, Fr

Unselbständiges Werk

200014648

This paper gives the results of a quantitative analysis of the bark anatomical structures of the Norway spruce (Picea abies (L.) Karst.). The aim of the research was to find links between the different levels in the attack intensity by the bark beetles Ips typographus L. and the variability of the bark structure between and within trees. The structure were quantified on 19 trees of 2 spruce stands located in the belgian Ardennes. Bark samples were taken from 3 heights (1.5-3-6m) and 2 faces (north and south). On 40 thick microscopic preparations, we quantified the different tissular groups, the resiniferous system, the secondary phloem sclerenchyma and the crystal cells. All the analysed characteristics showed a marked variability between trees. Nevertheless, the importance of the resiniferous system was not significantly different among the spruces; this appeared only in one stand studied. The 3 heights were a significant source bark structure variability except for the transversal resiniferous system section and the crystal cell frequency. No differences were found between the 2 orientations, except for the sclerenchyma volume. But in this case, the difference was lower than between the individuals or between the levels at which the samples were taken; furthermore, this difference existed only in one site. In conclusion, the variability in bark structures between the trees appears to be important and further research on the insect's attacks is required.