Marginal parenchyma bands and crystalliferous chains as indicators of age in African Acacia species
Abstract
Sample discs were taken at approximately breast height from 11 trees, of known age and management history, representing 6 species of Acacia (A. erioloba, A. fleckii, A. karroo, A. nilotica, A. tortilis and Faidherbia [Acacia] albida). 皇冠体育app trees came from Zimbabwe, Malawi, Kenya and Somalia. Radial cross sections of wood were examined for growth rings, which were apparent in most species as narrow bands of marginal parenchyma filled with long crystal chains. 皇冠体育app number of bands formed annually corresponded to the number of peaks in rainfall distribution. Samples from specimens of African Acacia species from the Oxford Forestry Institute's xylarium (FHOw) were also examined for similar crystalliferous chains, which were generally present. 皇冠体育appse results suggest that marginal parenchyma bands and crystalliferous chains define growth phases in African Acacia species, and may therefore be useful for age determination.
Citation
Gourlay, I.D.; Kanowski, P.J. Marginal parenchyma bands and crystalliferous chains as indicators of age in African Acacia species. IAWA Bulletin (1991) 12 (2) 187-194.
Links
Marginal parenchyma bands and crystalliferous chains as indicators of age in African Acacia species