ユーカリの材質育種における選抜指標抽出に関する研究 (第5報)
E. camaldulensis, E. globulus における容積重, および材形質含量の樹幹内変異と標準値を示す位置について
1995 年 49 巻 8 号 p. 1227-1234
詳細
1995 年 49 巻 8 号 p. 1227-1234
Within-tree variations, whole-tree values and the representative heights for the whole tree value of basic density, and contents of wood components per volume were analysed for two trees of Eucalyptus camaldulensis and E. globulus respectively, grown at the seed orchard in Western Australia to do quality breeding.
Within-tree variation of E. camaldulensis was rather uniform as 500±40, 532 ±34 kg/m3, but that of E. globulus was large as 595 ± 69, 616 ± 79 kg/m3 and the basic density was higher in bark side and upper part in the trunk, to be expected to have higher pulp productivity.
The whole-tree values of E. camaldulensis were 501, 520 kg/m3 and those of E. globulus were 594, 640 kg/m3 and the difference of the species was observed.
Representative heights for the whole-tree contents ±5 % were 0.32.8 m on E. camaldulensis, and 0.8 and 2.8 m on E. globulus regardless the differences in the whole-tree height and the within-tree variation when they were chosen below 3.3 m height for sampling an increment core.
Representative heights were also determined for contents of wood components per volume as follows ; for E. camaldulensis, holocellulose : 1.3, 2.8 m, cellulose : 2.83.3 m, hemicellulose : 0.82. 8 m, lignin : 0.81.3, 2.8 m, extractives : 2.3 m, alkali-extractives : 1.3 m, and total-extractives : 2.32.8 m, for E. globulus, 2.8 m, 2.32.8 m, 2.8 m, 0.30.8 m, 2.83.3 m, 2.83.3 m and 2.8 m in the same manner.
It is expected that whole-tree pulp properties including pulp productivity are predicted by the increment core taken from these representative heights.
