Showing papers on "Eucalyptus camaldulensis published in 1971"
TL;DR: Mapping of both univariate and multivariate results indicated that there are two major ecotypes and some evidence of clinal and ecotypic variation within them and support those of other workers both in natural populations in Australia and in exotic populations elsewhere.
Abstract: Eight morphological characters of leaves were examined in 2-year-old trees of 25 provenances of Eucalyptus camaldulensis Dehn, grown in a replicated trial in Zambia. Provenances differed significantly in leaf length and width, base angle, and oil gland density but significant effects were attributed to trees within provenances. Leaf curvature also varied between provenances, trees, and branches. The tip angle and the number of veins did not vary significantly. Leaf length and oil gland density were related to maximum temperature at seed source rather than to latitude but the reverse occurred for leaf width. Significant amounts of variation were explained by a linear combination of temperature and latitude but not by longitude, altitude, or rainfall. Information on seven traits was combined in principal component analysis in which the first component (a measure of leaf shape) accounted for 36% of total observed variation while the second (weighted largely on leaf length) accounted for 26%. Mapping of both univariate and multivariate results indicated that there are two major ecotypes and gave some evidence of clinal and ecotypic variation within them. The conclusions support those of other workers both in natural populations in Australia and in exotic populations elsewhere.
13 citations
10 citations
TL;DR: In this article, the authors investigated the evolution of Eucalyptus camaldulensis and found that lignotuber occurrence is closely related to the seed origin and has a transient character.
10 citations
TL;DR: The relation of heat resistance to wax deposits, colour, and temperatures of leaf surfaces is examined and the implications of the findings in the phylogeny and ecotypic divergence of the species and its cultivation outside its natural habitats in Australia are discussed.
Abstract: Depending upon the seed provenance, the heat resistance value of leaves of E. carnaldulensis varies from 47.4 to 50.0°C. It is not related to the mean maximum temperature of the hottest month at the seed source. The relation of heat resistance to wax deposits, colour, and temperatures of leaf surfaces is examined. The implications of the findings in the phylogeny and ecotypic divergence of the species and its cultivation outside its natural habitats in Australia are discussed.
9 citations
TL;DR: It is concluded that heart cracks developed in the end faces of small round specimens of red gum independently of drying stresses and other factors such as the impact force of the tree striking the ground.
Abstract: SUMMARY Heart cracks developed in the end faces of small round specimens of red gum (Eucalyptus camaldulensis Dehn) independently of drying stresses and other factors such as the impact force of the tree striking the ground. It is concluded that the cracks were initiated principally as the result of relief of longitudinal growth stresses after crosscutting. When log ends were subjected to very mild drying conditions, heart cracks appeared after only 20 minutes exposure, apparently because of the additional stresses imposed due to shrinkage of the end surface or collapse.
1 citations