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Sapwood hydraulic conductivity and leaf area – sapwood area relationships following thinning of a Eucalyptus nitens plantation (2002)

Medhurst, J. L. ; Beadle, C. L.

Oxford, UK : Blackwell Science Ltd

Plant, cell & environment 25 (2002), S. 0

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ISSN: 1365-3040

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: This study tested the hypothesis that the relationship between leaf area (projected, or one-sided) and sapwood area in Eucalyptus nitens (Deane and Maiden) Maiden is affected by thinning treatment. However, no difference in the relationship between leaf area and sapwood area was found 8 years after thinning. This result suggests that a single regression equation can be used to predict the leaf area of trees in thinned and unthinned stands. The relationship was non-linear, implying a causal relationship between growth rate and the ratio of leaf area to sapwood area (Al : As). Sapwood hydraulic conductivity increased by approximately 100% from breast height to crown base, whereas sapwood area decreased by 19%. This implies that the efficiency of water transport through the sapwood increased by 60% along this length. This conclusion is supported by the Al : As relationships which showed that the sapwood area at crown base supported, on average, close to 60% more leaf area than a similar amount of sapwood area at breast height. That large trees in this study had greater hydraulic conductivity and higher Al : As lends support to the argument that resource capture, and hence growth rate, influence sapwood hydraulic conductivity.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1046/j.1365-3040.2002.00880.x

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Allometric relationships for Eucalyptus nitens (Deane and Maiden) Maiden plantations (1999)

Medhurst, J. L. ; Battaglia, M. ; Cherry, M. L. ; [et al.]

Springer

Trees 14 (1999), S. 91-101

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ISSN: 0931-1890

Keywords: Key words Allometry ; Leaf area ; Sapwood area ; Crown structure ; Eucalyptus nitens

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: 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 site-specific 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 post-canopy 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.