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Wood biological investigations on norway spruce clones of different levels of sensitivity to fumigation with hydrogen fluoride



Wood biological investigations on norway spruce clones of different levels of sensitivity to fumigation with hydrogen fluoride



Angewandte Botanik 59(1-2): 81-94



The quantity and quality of the wood of fumigated Norway spruce trees (Picea abies (L.) Karst.) were investigated on the basis of 30 clones, 6 ramets each, derived from a fumigation experiment with HF. The radial increment was studied in the year of fumigation (1978) as well as in that before (1977) and after fumigation (1979), using tree-ring analysis, X-ray densitometry, histometrical analysis, and various statistical evaluations. The spruce trees were of different sensitivity to the fumigation that was performed at the end of July 1978. In the tree rings of 1977 no anatomical differences could be detected. The latewood formation in 1978 was also not influenced by the fumigation, although it was not yet completed. In the year after fumigation (1979) some significant differences occurred in the earlywood, but not in the latewood. The relationship between tree-ring width and latewood percentage was also investigated. A negative influence of air pollution on this wood-quality criterion could not be found for any of the 3 rings. Factor anlaysis demonstrated that the essential wood characteristics after fumigation can be adequately estimated on the basis of needle damage assessment. Increment reduction in the Norway spruce can be caused by HF -pollution. There are no indications of a decrease in wood quality.

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