Allometric relationships for Eucalyptus nitens (Deane and Maiden) Maiden plantations

Abstract

Allometric relationships between stem, leaf area and crown dimensions were determined for Eucalyptus nitens (Deane and Maiden) Maiden using 81 trees sampled from 13 post-canopy closure sites and 34 trees sampled from 6 pre-canopy closure sites. These sites differed in site quality, stand age, fertiliser treatment, stand density and levels of weed infestation. Overall, tree age ranged from 2 to 13 years, tree height from 1.4 to 26.1 m and diameter at breast height from 0.6 to 38.7 cm. Pre-canopy closure trees exhibited sitespecific relationships which were to some extent confounded with tree age. However, post-canopy closure trees had relationships which were independent of site, age and silvicultural treatments. Strong relationships between structural components were found for both stem and crown. Stem diameter at breast height was non-linearly related to tree height and crown length. Stem sapwood area (breast height or crown base) could be predicted from stem cross-sectional area. For postcanopy closure trees, a functional relationship between sapwood area (breast height and crown base) and leaf area was site-independent. The lack of specificity in terms of both site and management techniques enables these relationships to be applied generally to E. nitens plantations in Tasmania.

The use of Eucalyptus in agroforestry systems of southern Rwanda : to integrate of segregate

“…The obtained models in the current study are reasonably accurate irrespective the high variability in site conditions, stand management, age and cutting cycle for short rotation coppice stands. This, according to Medhurst et al (1999), may imply fitness and the power of the predictive capacity of a model in question.…”

Coupling Fine-Scale Root and Canopy Structure Using Ground-Based Remote Sensing

“…The spatial scale (3.5-4 m) of maximum canopy-root structural correspondence at our sites may approximate the average individual-tree biomass footprint, which generally increases above-and belowground with forest age. For example, mean tree crown length, stem diameter, and root length increased with age in a number of different ecosystems [1,[43][44][45][46]. A second scale of significant coherence at 8 m in the oldest stand is a signal of high variation in individual-tree footprint size within this complex late successional forest, which contains a mosaic of smaller closely-spaced trees and larger mature trees spaced farther apart; in contrast, the younger stands have one primary canopy layer comprised of geometrically less variable trees and, therefore, more uniform in biomass footprint size ( Figure 4, Table 1; [35,37]) …”

Pruning of Eucalyptus grandis x Eucalyptus urophylla planted at low density in Southeastern Brazil

“…The moment of canopy closure is dependent on the planting density and growing conditions (Beadle, 1997;Montagu et al, 2003). For Eucalyptus species, canopy closure usually occurs between the ages of 1 and 4 years (Medhurst et al, 1999;Ryan et al, 2004). At the moment of canopy closure, the tree's lower crown does not contribute much in terms of carbon allocation and tree growth (Montagu et al, 2003), allowing high levels of green crown removal (up to 50%) without affecting tree growth.…”