Implications of early browsing damage on the long term productivity of eucalypt forests

Wilkinson, Graham; Neilsen, W. A.

doi:10.1016/0378-1127(94)03502-n

Cited by 51 publications

(40 citation statements)

References 6 publications

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“…Normally, S T would be calculated as the percentage of 16 m 2 plots containing at least one seedling, regardless of browsing damage, while S A would be the percentage of plots containing at least one undamaged or substantially undamaged seedling, where substantial damage is defined as the removal of the whole crown (Wilkinson and Neilsen, 1995). Due to different sized plots (15 and 4.37 m 2 ) used in this study, however, we estimated 16 m 2 stocking from an h-factor graph (Lutze, 2003), which represents the relationship between seedling density, heterogeneity (Mount, 1961) and 16 m 2 stocking.…”

Section: Browsing Impactmentioning

confidence: 99%

Interactions between timber harvesting and swamp wallabies (Wallabia bicolor): Space use, density and browsing impact

Stefano

Anson

York

et al. 2007

Forest Ecology and Management

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Section: Browsing Impactmentioning

confidence: 99%

Interactions between timber harvesting and swamp wallabies (Wallabia bicolor): Space use, density and browsing impact

Stefano

Anson

York

et al. 2007

Forest Ecology and Management

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“…Following destructive sampling in May 2000, predicted volumes were found to agree with observed data (no significant difference at 5% and 0.1% levels). Volumes of the remaining trees were calculated using a log(volume) to log(stem basal area) regression relationship, corrected for bias, established from the trees measured for height after the method of Snowdon (1991) and Wilkinson and Neilsen (1995). Stand volume was the sum of stem basal areas corrected to a hectare basis.…”

Section: Volumementioning

confidence: 99%

Physiological basis of spacing effects on tree growth and form in Eucalyptus globulus

Henskens

Battaglia

Cherry

et al. 2001

Trees

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We examine the effects of spacing and layout on the growth and form of 3-to 4-year-old Eucalyptus globulus in a farm forestry context. Four planting layouts were chosen. These represented the range commonly in use in farm forestry: block plantings (2×4 m), triple rows (2×4 m) at 10-m intervals, single rows (2×10 m) and isolated trees (10×10 m). The physiological significance of key results is interpreted in terms of changes in the parameters of a simple plantation growth model. Under conditions where levels of direct light are high, for example during summer, block-planted trees intercepted only 38% of the light intercepted by isolated trees. On a stand basis, however, the combination of incident radiation and ground coverage declined with lower stand densities. While stand leaf area index declined from around 6 to 1 with increased spacing, individual tree leaf areas rose from around 50 m 2 in block plantings to 150 m 2 in isolated trees. The proportion of above-ground biomass found in stems declined with increasing spacing as the mass in foliage and branches increased. Stems accounted for 65% of above-ground biomass in block-planted trees but only 35% in isolated trees. The contributions of leaves and branches correspondingly rose from 19% to 35% and from 16% to 29%, respectively. Changes in biomass distribution were accompanied by increasing branch number, branch thickness, flatter branch angles and the longer retention of lower branches with greater spacing. These changes have implications for the merchantability of the timber. The efficiency of aboveground radiation conversion was constant at 0.67 g MJ -1 irrespective of spacing. We estimated that foliar maintenance respiration (R m ) accounted for about 90% of above-ground R m . On a stand basis R m costs block plantings 23.90 t DM ha -1 year -1 (50% annual above-ground photosynthetic production) compared with 6.22 t DM ha -1 year -1 (40% annual above-ground photosynthetic production) in stands of isolated trees.

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“…These three species are all relatively generalist within their respective feeding niches of mixed feeders and folivores (Statham, 1983;Jarman and Phillips, 1989;Sanson, 1989;McArthur et al, 1991;Sprent and McArthur, 2002). Browsing by these animals can reduce plantation productivity through a reduction in seedling growth rate and survival, and by changing tree form (Wilkinson and Neilsen, 1995;Bulinski and McArthur, 1999). One potential method of reducing browsing damage to seedlings could involve manipulating both seedling palatability and characteristics of other vegetation on plantations in order to modify herbivore feeding behaviour.…”

Section: Introductionmentioning

confidence: 96%

Characteristics of tree seedlings and neighbouring vegetation have an additive influence on browsing by generalist herbivores

Miller

McArthur

Smethurst

2006

Forest Ecology and Management

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Implications of early browsing damage on the long term productivity of eucalypt forests

Cited by 51 publications

References 6 publications

Interactions between timber harvesting and swamp wallabies (Wallabia bicolor): Space use, density and browsing impact

Interactions between timber harvesting and swamp wallabies (Wallabia bicolor): Space use, density and browsing impact

Physiological basis of spacing effects on tree growth and form in Eucalyptus globulus

Characteristics of tree seedlings and neighbouring vegetation have an additive influence on browsing by generalist herbivores

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