Within-tree variations, whole-tree values and the representative heights for the whole-tree contents of extraneous components were analysed for
Eucalyptus camaldulensis and
E. globulus for the quality breeding using an increment core without cutting the tree. Three kinds of extraneous components were examined as extractives extracted by Soxhlet apparatus, alkali-extractives, and total-extractives which was sum of them.
Within-tree variation of extractives content in
E. camaldulensis was observed as higher in lower part, and the contents of alkali-extractives and total-extractives were higher in pith side and lower part. The parts, high in extractives were almost same as the colored heartwood. In contrast, all extractives contents in
E. globulus were very uniform in a tree Consequently, lower parts in a tree of
E. camaldulensis would have lower pulp yield and digestability than other parts.
The whole-tree contents of extraneous components had the difference between species and between trees in
E. camaldulensis.
Representative heights, the whole-tree contents ± 5%, of all extractives were calculated to be below 3.3 m height for sampling of an increment core. The results were 2.3 m for
E. camaldulensis, and 2.8 m for
E. globulus, regardless the whole-tree height and the difference of within-tree variation of contents in extraneous components.
It is expected that whole-tree pulp properties are predicted by the increment core taken from these representative heights.
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