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Chemical Studies on Tue Wood of Declining Conifers

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The soluble components in the wood of conifers (Picea abies, Pinus sylvestris) of different damage c1asses from various sites in Bavaria have been studied. Fresh sapwood wassqueezed and the sap analysed for the amounts of carbohydrates as weil as for the pH value. The investigation of the alkali extracts included the determination of carbohydrates and lignin. Changes in the composition related to tree disease can only be observed in strongly damaged or dead trees. In these cases the pH value and the amounts of the main sugars (fructose, glucose) decrease and the amount of the oligosaccharides increases. In some spruce trees of high damage classes the alkali-soluble lignin also increases. The ex ternal appearance of a tree does not reflect its in temal condition in all cases.


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