Journal articles: 'Eucalyptus delegatensis'

1

Bowman, DMJS, and JB Kirkpatrick. "Establishment, Suppression and Growth of Eucalyptus delegatensis R.T. Baker in Multiaged Forests. I. The Effects of Fire on Mortality and Seedling Establishment." Australian Journal of Botany 34, no. 1 (1986): 63. http://dx.doi.org/10.1071/bt9860063.

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In the dry uneven-aged eucalypt forests of central Tasmania the establishment of seedlings of Eucalyptus delegatensis requires a mitigation of the competition provided by the understorey, regeneration being observed to follow both fire and cultivation. Most of the adult trees of E. delegatensis survive even severe fires, although there can be considerable later mortality associated with mechanical failure of the base of the trunk. E. delegatensis dry forest usually has a distinctive sapling layer. Fire kills most of these saplings, the mortality rate being inversely related to their height and bark thickness.

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2

Hallam, P. M., J. B. Reid, and C. L. Beadle. "Frost hardiness of commercial Eucalyptus species at different elevations." Canadian Journal of Forest Research 19, no. 10 (October 1, 1989): 1235–39. http://dx.doi.org/10.1139/x89-188.

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Six Eucalyptus species, E. regnans F. Muell., E. delegatensis R.T. Bak., E. globulus Labill., E. nitens (Deane & Maid.) Maid., E. pauciflora Sieb. ex Spreng, and E. grandis Hill ex Maid., were sampled for determination of frost hardiness in March (late summer) and August (late winter) 1985 from trial plantings at four elevations in southern Tasmania. In March, there was a statistically significant difference between sites, but not between species or provenances. In August, significant differences between species, and for E. delegatensis between provenances, had developed. The species ranked in order of increasing frost hardiness as follows: E. regnans < E. grandis < E. globules = E. delegatensis (Maydena provenance) < E. pauciflora < E. nitens < E. delegatensis (Guildford provenance). Greatest frost hardiness was developed at the 60-m site (elevation), followed by (in decreasing order) the 650-m site, the 440-m site, and the 240- m site. This order corresponded to the minimum temperatures experienced at the sites. Conversely, greatest growth occurred at the 60-and 240-m sites followed by the 440-m site and then the 650-m site, corresponding to decreasing maximum temperatures. It is argued that good growth and productivity are possible on quite frost prone sites, provided suitable provenances are selected for planting.

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Doherty, Michael D., A. Malcolm Gill, Geoffrey J. Cary, and Mike P. Austin. "Seed viability of early maturing alpine ash (Eucalyptus delegatensis subsp. delegatensis) in the Australian Alps, south-eastern Australia, and its implications for management under changing fire regimes." Australian Journal of Botany 65, no. 7 (2017): 517. http://dx.doi.org/10.1071/bt17068.

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Eucalyptus delegatensis R.T. Baker subsp. delegatensis is an interval-sensitive, fire-killed eucalypt that dominates large tracts of montane forest in the Australian Alps. Although it has been widely accepted in forest management that E. delegatensis takes 20 years to flower and fruit after stand-replacing fire events, recent observations after high intensity fires in the Australian Alps have shown that early flowering and fruiting is occurring from what can be termed ‘precocious’ individuals in some areas. In some instances, early flowering and fruit set is occurring within 6 years after stand-replacing fire. One historical study in the Australian Capital Territory had noted that such seed was viable, but we found no reported experiments documenting this or detailing the degree of viability. Here we discuss the results of a germination experiment undertaken on seed collected from Namadgi National Park from early-maturing alpine ash trees. Although at the low end of known viability estimates for E. delegatensis, seed from these individuals was nonetheless found to be viable, with a mean of 455 (s.d. = 139) germinants per 10 g of chaff and seed mix. We discuss this result in relation to fire management in the Australian Alps and suggest further research that needs to be undertaken to better document and understand the phenomenon.

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Prado D., José Antonio, Juan Carlos Bañados M., and Andrés Bello D. "Antecedentes sobre la capacidad de retoñación de algunas especies del género Eucalyptus en Chile." Ciencia & Investigación Forestal 4, no. 2 (July 6, 1990): 183–90. http://dx.doi.org/10.52904/0718-4646.1990.139.

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Se analiza la capacidad de retoñación de 5 especies del género Eucalyptus, E. delegatensis, E. globulus ssp. globulus, E. nitens, E. regnans y E. viminalis. Un año después de la corta sólo E. regnans no presentaba una retoñación suficiente como para asegurar la siguiente rotación de monte bajo. Las otras especies retoñaron bien, incluso E. nitens y E. delegatensis, especies que tradicionalmente se han considerado con ciertas limitaciones para rebrotar después de la corta.

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Old, KM, R. Gibbs, I. Craig, BJ Myers, and ZQ Yuan. "Effect of Drought and Defoliation on the Susceptibility of Eucalypts to Cankers Caused by Endothia gyrosa and Botryosphaeria ribis." Australian Journal of Botany 38, no. 6 (1990): 571. http://dx.doi.org/10.1071/bt9900571.

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Seedlings, saplings and mature eucalypts were susceptible to infection by Endothia gyrosa and Botryosphaeria ribis. Eucalyptus regnans and E. delegatensis were more susceptible than E. grandis and E. saligna. In trees not subjected to stress, cankers were limited in extent and often healed. When trees were defoliated, either manually or by severe insect attack, stem concentrations of both starch and soluble carbohydrates were reduced and canker development in some pathogen/host combinations was increased. Seedlings subjected to water stress were not predisposed to canker formation. The association of E. gyrosa with branch dieback of rural eucalypts suffering from chronic defoliation suggests that canker fungi contribute to the crown dieback syndrome in south-eastern Australia.

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6

Ilic, J. "Woods of Eucalyptus-Part 1 Distinguishing Three Species from the Ash Group." IAWA Journal 18, no. 1 (1997): 27–36. http://dx.doi.org/10.1163/22941932-90001457.

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In Australia the ash group of eucalypts comprises approximately 35 species of Eucalyptus from the botanical series Obliquae. They are abundant in south-eastern Australia, but timber of commerce comes mainly from Victoria and Tasmania and includes E. regnans F. Muell., E. delegatensis R.T. Baker and E. obliqua L'Hérit. This group produces some of the fastest growing and the highest yielding hardwood species in Australia. The timbers are similar in appearance and can be interchanged for many uses, but there are some important differences. This study found differences between the species in basic density, distinctness of growth rings and pore grouping, ray width, proportion of multiseriate rays, and the height of the multi seriate proportion of the rays. Differences between mainland and Tasmanian provenances were also observed. Growth rings are prominent in E. delegatensis from the mainland, but less so from Tasmania, and least distinct in E. obliqua. Basic density can be used to distinguish E. obliqua when samples are heavier than 605 kg/ m3, and E. regnans for samples less than 390 kg/m3. Height of the multiseriate portion of the rays is 1-9, mostly 5 cells in E. obliqua, whereas it is 1-5, mostly 1-2(-4) cells high in the other two species; maximum height of the multi seriate portion of the rays is 3-12, mostly 4-8 cells in E. obliqua, 1-6, mostly 1-2 cells in E. delegatensis, and 1-8, mostly 1-3 cells in E. regnans; width of individual ray cells 10-30 µm, mostly 15-20 µm in E obliqua, and 5-16 µm, mostly 8-12 µm in the other two species. A key for separation between the species is given and the similarities to other species are discussed. Other commercially important species will be dealt with subsequently.

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7

Schimleck, L. R., R. Evans, and J. Ilic. "Estimation of Eucalyptus delegatensis wood properties by near infrared spectroscopy." Canadian Journal of Forest Research 31, no. 10 (October 1, 2001): 1671–75. http://dx.doi.org/10.1139/x01-101.

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The use of calibrated near infrared (NIR) spectroscopy for the prediction of a range solid wood properties is described. The methods developed are applicable to large-scale nondestructive forest resource assessment and to tree breeding and silvicultural programs. A series of Eucalyptus delegatensis R.T. Baker (alpine ash) samples were characterized in terms of density, longitudinal modulus of elasticity (EL), microfibril angle (MFA), and modulus of rupture (MOR). NIR spectra were obtained from the radiallongitudinal face of each sample and used to generate calibrations for the measured physical properties. The relationships were good in all cases, with coefficients of determination ranging from 0.77 for MOR through 0.90 for EL to 0.93 for stick density. In view of the rapidly expanding range of applications for this technique, it is concluded that appropriately calibrated NIR spectroscopy could form the basis of a "universal" testing instrument capable of predicting a wide range of product properties from a single type of spectrum obtained from the product or from the raw material.

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8

McBride, Timothy C., Aaron Organ, and Elizabeth Pryde. "Range extension of Leadbeater's possum (Gymnobelideus leadbeateri)." Australian Mammalogy 42, no. 1 (2020): 96. http://dx.doi.org/10.1071/am18025.

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We report spotlight and camera-trap observations of Leadbeater’s possum (Gymnobelideus leadbeateri) at six locations up to 15km east of its described range. Half of our records occurred in fire-affected, mixed-species forest, with a tree species and seral stage composition that differs markedly from its predominant habitat: late-mature forests dominated by Eucalyptus regnans, E. delegatensis and E. nitens.

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Suter, Stephanie G., Gavin N. Rees, Garth O. Watson, Phillip J. Suter, and Ewen Silvester. "Decomposition of native leaf litter by aquatic hyphomycetes in an alpine stream." Marine and Freshwater Research 62, no. 7 (2011): 841. http://dx.doi.org/10.1071/mf10268.

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Despite the recognised significance of hyphomycetes in the degradation of leaf litter in streams, few studies have been carried out in alpine environments and none in Australian alpine streams. We hypothesised that the fungal communities responsible for leaf decomposition would change over immersion time, and would respond differently at different sites and on different types of vegetation. Leaf bags containing Epacris glacialis (F. Muell.), Eucalyptus pauciflora (Sieber ex. Spreng) and Eucalyptus delegatensis (R.T. Baker) were deployed at different sites in a stream in the Victorian Alpine National Park, south-eastern Australia. Leaf colonisation was delayed for 2 weeks and decay constants for E. pauciflora and E. delegatensis were 0.004–0.005 and 0.006 respectively. Maximum fungal biomass on leaves was similar to that in previous published studies, whereas sporulation rates were two or three orders of magnitude lower, indicating a reduced reproductive effort. Sporulation and DNA-based studies combined showed that fungal communities on the decomposing leaf material changed over time and exhibited significant preferences for leaf type and study site. We have shown that aquatic hyphomycetes can degrade physically tough leaves of Australian alpine plant species, potentially contributing to pathways for particulate carbon to enter alpine-stream food webs.

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10

Battaglia, M., and JB Reid. "Ontogenetic Variation in Frost Resistance of Eucalyptus delegatensis R. T. Baker." Australian Journal of Botany 41, no. 1 (1993): 137. http://dx.doi.org/10.1071/bt9930137.

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The frost resistance of Eucalyptus delegatensis is shown to vary with seedling age over the first 6 months of development. Much of this variation is a result of the differing sensitivity of leaves originating from different leaf nodes, although older leaves from the same node may be more frost resistant than recently expanded leaves. Newly emergent seedlings appear to be the most susceptible stage of the tree's lifecycle to death by frost.

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11

Battaglia, M. "Seed Germination Physiology of Eucalyptus delegatensis R. T. Baker in Tasmania." Australian Journal of Botany 41, no. 1 (1993): 119. http://dx.doi.org/10.1071/bt9930119.

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The seed germination response of seedlots from five geographically disparate provenances of Eucalyptus delegatensis to temperature, stratification, soil matric potential, relative humidity and interrupted imbibition was examined. The species was found to have a distinct temperature optimum of between 15 and 20°C, and a minimum temperature for germination of approximately 2°C. Short periods of exposure to high temperatures did not substantially affect germination performance. Stratification greatly increased the range of temperatures over which a high proportion of the seed germinated. Increases in the rate of germination with stratification are related to accrued thermal time during stratification. Pre-imbibing seeds at water potentials down to -2 MPa increased the rate of germination; however, no advantage was found after pre-imibibing at -3 MPa. This increased germination rate was associated with a shortening of the time to commencement of germination and more synchronous germination. Germination rate and germination capacity were impeded by soil matric potentials below -0.01 MPa, and germination was totally inhibited by soil matric potentials below -0.5 MPa. Soil matric potential and temperature interacted in their effects on germination capacity, and seeds germinating at near optimum temperatures were less sensitive to soil moisture stress. Seeds survived dehydration within 60 h of the commencement of imbibition, but were increasingly affected by dehydration thereafter. The rate of imbibition was influenced by the ambient temperature and solution water potential. At modest levels of water stress, imbibition was not impeded and the reduction in germination capacity was probably due to the inhibition of growth related processes. Differences in germination response were detected between the seedlots and these could be related to the geographic origin of the seedlots.

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12

Bowman, DMJS, and JB Kirkpatrick. "Establishment, Suppression and Growth of Eucalyptus delegatensis R.T. Baker In Multiaged Forests .II. Sapling Growth and Its Environmental Correlates." Australian Journal of Botany 34, no. 1 (1986): 73. http://dx.doi.org/10.1071/bt9860073.

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Seedling and sapling regrowth occupies gaps and includes part of the understorey in the multiaged Eucalyptus delegatensis dry forests of central Tasmania. This regrowth is even-aged for any particular area. Variation in sapling height is symmetrical across east to west sections of gaps, 20-50 m diam., but asymmetrical in the north to south sections, where the tallest seedlings are found to the south. Density, height, diameter and wet weight of E. delegatensis regrowth are highly positively correlated with the distance to the nearest tree but are only related to solar radiation in the gaps. Concentrations of most major plant nutrients in the surface soil, and soil moisture-holding capacity, have no strong relationship with the various growth measures. Thus, adult trees suppress sapling growth independent of incident solar radiation, while sapling growth outside the influence of adult trees increases with increasing incident solar radiation.

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13

Moran, GF, JC Bell, and S. Prober. "The utility of isozymes in the systematics of some Australian tree groups." Australian Systematic Botany 3, no. 1 (1990): 47. http://dx.doi.org/10.1071/sb9900047.

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The utility of isozyme analysis in elucidating the relationship between Australian tree taxa is reviewed. Although little exploited to date, isozyme analysis is shown to be a rapid and relatively powerful method of examining relationships, if used at an appropriate taxonomic level. For Eucalyptus and Acacia, isozymes appear to be the most informative at the lower taxonomic levels. In Eucalyptus delegatensis and Casuarina cunninghamiana, isozyme data strongly support subspecies erected on the basis of morphological characteristics. In Acacia holoserocea, isozyme data predicted the existence of two subspecies, which prediction as later supported by morphological characters. An isozyme study of the phylogenetic relationships within the 'green ash' group of eucalypts yielded a phylogenetic hypothesi comparable to one derived from morphological characters, but also highlighted areas of discrepancy requiring further research. At the generic level, isozyme data for the Australian species of Litsea and Neolitsea successfully separated the two genera and allowed phylogenetic relationships within genera to be hypothesised. For the larger tree genera such as the Eucalyptus and Acacia, however, the utility of isozymes at the higher taxonomic levels is likely to be low, because of the difficulty in establishing homologies between taxa, or insufficient phylogenetic information when taxa being compared have few alleles in common.

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14

Battaglia, M., and JB Reid. "The Effect of Microsite Variation on Seed-Germination and Seedling Survival of Eucalyptus delegatensis." Australian Journal of Botany 41, no. 2 (1993): 169. http://dx.doi.org/10.1071/bt9930169.

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The correlation between microsite and seedling numbers was determined in field sowings, and the impact of microsites on germination and seedling survival tested in artificial seedbeds in the glasshouse. Small scale variation in soil conditions, at the scale of tens of centimetres, markedly affected the germination and establishment of Eucalyptus delegatensis R.T.Baker seeds and seedlings. Under conditions of limiting soil moisture, microsites that afforded protection, and probably resulted in increased humidity, caused a marked increase in germination number and rate. The mean survival time was significantly higher on these protected microsites than on less protected microsites, or on microsites that restricted root penetration. The importance of this variability in microtopography was strongly influenced by season and the level of environmental stress, and was diminished as seedlings aged. Due to the different requirements for seed germination and seedling growth, a favourable microsite for germination was not necessarily a favourable site for seedling survival. A comparison of seed and seedling responses to water stress indicated that for E. delegatensis, at least, selection due to microsite differences at the time of germination may not have an impact on the developmental characteristics of the seedlings.

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Schimleck, L. R., R. Evans, J. Ilic, and A. C. Matheson. "Estimation of wood stiffness of increment cores by near-infrared spectroscopy." Canadian Journal of Forest Research 32, no. 1 (January 1, 2002): 129–35. http://dx.doi.org/10.1139/x01-176.

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The use of calibrated near-infrared (NIR) spectroscopy for predicting the radial variation of the longitudinal modulus of elasticity (EL) of increment cores is described. Sets of Eucalyptus delegatensis R.T. Baker (alpine ash) and Pinus radiata D. Don (radiata pine) samples were characterized in terms of EL(SS) (estimated stiffness based on a combination of SilviScan-2 diffractometric data and measured density (R. Evans and J. Ilic. 2001. For. Prod. J. 51(3): 5357)). NIR spectra, obtained from the radiallongitudinal face of each sample, were used to develop EL(SS) calibrations for the E. delegatensis and P. radiata sample sets and the two sets combined. The relationships between laboratory-determined EL(SS) and NIR-fitted EL(SS) were good in all cases. EL(SS) was estimated in separate test sets and found to correlate well with measured EL. NIR spectra were obtained in 15-mm sections from the radiallongitudinal face of two intact P. radiata increment cores. EL(SS) of each section was estimated using the P. radiata and the combined P. radiata and E. delegatensis calibrations. NIR estimates of EL(SS) were in good agreement with SilviScan-2 determined stiffness indicating that NIR spectroscopy can be successfully used to estimate radial variation in wood stiffness of increment cores.

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16

Schimleck, L. R., R. Evans, and J. Ilic. "Estimation of Eucalyptus delegatensis wood properties by near infrared spectroscopy." Canadian Journal of Forest Research 31, no. 10 (2001): 1671–75. http://dx.doi.org/10.1139/cjfr-31-10-1671.

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17

Infante L., Pedro, Roberto Ipinza Carmona, and José Antonio Prado D. "Bases para la mejora genética de las especies del género Eucalyptus en Chile." Ciencia & Investigación Forestal 5, no. 1 (July 6, 1991): 71–95. http://dx.doi.org/10.52904/0718-4646.1991.148.

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El objetivo del programa de mejora genética de InFor es aportar a los cultivadores de eucalipto, en especial a los pequeños y medianos propietarios un conjunto de semillas, clones y cultivares selectos ya sea para la producción de fibra, madera de alta calidad, de energía y otros subproductos del bosque. Tomando como base los resultados obtenidos en el programa de introducción de especies, llevado a cabo por el InFor durante las tres últimas decadas, se escogieron en una primera etapa las siguientes especies: E. camaldulensis, E. globulus ssp. globulus, E. nitens, E. delegatensis y E. regnans.

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18

Close, Dugald C., and Stephen J. Wilson. "Provenance effects on pre-germination treatments for Eucalyptus regnans and E. delegatensis seed." Forest Ecology and Management 170, no. 1-3 (October 2002): 299–305. http://dx.doi.org/10.1016/s0378-1127(01)00768-x.

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19

Ellis, R. C., and P. I. Pennington. "Factors affecting the growth of Eucalyptus delegatensis seedlings in inhibitory forest and grassland soils." Plant and Soil 145, no. 1 (September 1992): 93–105. http://dx.doi.org/10.1007/bf00009545.

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20

WOODS, P. V., and R. J. RAISON. "Decomposition of litter in sub-alpine forests of Eucalyptus delegatensis, E. pauciflora and E. dives." Australian Journal of Ecology 8, no. 3 (July 28, 2006): 287–99. http://dx.doi.org/10.1111/j.1442-9993.1983.tb01326.x.

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21

SINGH, A. P. "Fine Structure of Hydrolysed Primary Walls in Tracheary Elements of Petiolar Xylem in Eucalyptus delegatensis." Annals of Botany 60, no. 3 (September 1987): 315–19. http://dx.doi.org/10.1093/oxfordjournals.aob.a087450.

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22

Mokany, K., R. E. McMurtrie, B. J. Atwell, and H. Keith. "Interaction between sapwood and foliage area in alpine ash (Eucalyptus delegatensis) trees of different heights." Tree Physiology 23, no. 14 (October 1, 2003): 949–58. http://dx.doi.org/10.1093/treephys/23.14.949.

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23

Phonetip, Khamtan, Barbara Ozarska, Gerry Harris, Benoit Belleville, and Graham Ian Brodie. "Quality assessment of the drying process for Eucalyptus delegatensis timber using greenhouse solar drying technology." European Journal of Wood and Wood Products 77, no. 1 (October 22, 2018): 57–62. http://dx.doi.org/10.1007/s00107-018-1364-2.

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24

Ilic, Jugo. "Relationship among the dynamic and static elastic properties of air-dry Eucalyptus delegatensis R. Baker." Holz als Roh- und Werkstoff 59, no. 3 (June 5, 2001): 169–75. http://dx.doi.org/10.1007/s001070100198.

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Lucas, Jessica, and Rebecca M. B. Harris. "Changing Climate Suitability for Dominant Eucalyptus Species May Affect Future Fuel Loads and Flammability in Tasmania." Fire 4, no. 1 (January 7, 2021): 1. http://dx.doi.org/10.3390/fire4010001.

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Fire management is becoming increasingly relevant in our changing climate as fire frequency and intensity increases both on a global scale and locally in Tasmania. The distribution of fuel across the landscape has significant impacts on fire regimes, influencing connectivity and flammability of fuel load. Remote sensing techniques are often used to assess current fuel loads, but projections of future fuel distributions are necessary for longer term planning of fire management. Eucalyptus species are an important, dominant component of many Tasmanian forests, influencing fuel load and flammability. We modelled the current and future climate suitability for two Eucalyptus species (E. delegatensis and E. obliqua), using a suite of species distribution models (SDMs) and global climate models (GCMs) for mid (2041–2060) and end of century (2061–2080) time periods. The implications these changes may have for the distribution of these important fuel species in the future are discussed. All GCMs projected notable changes in potential distribution, with both species contracting substantially in some areas and E. obliqua also exhibiting considerable expansions in the west of Tasmania. On average, suitability for E. delegatensis expanded by 5% ± 1.8% (1658 km2), contracted by 67% ± 22.7% (24,591 km2) and remained unchanged in 26% ± 7.8% (8783 km2) by the end of the century. For E. obliqua suitability expanded by a much greater 17% ± 6.3% (24,398 km2), contracted by slightly less at 55% ± 16.8% (81,098 km2) and remained unchanged in 45% ± 16.8% (63,474 km2) by the end of the century. These changes in climate suitability have the potential to cause changes in the composition and structure of Tasmania’s forests, impacting fuel loads. However, the two species exhibited different responses, reflecting their current distributions and suggesting that generalisations regarding species’ responses to changing climates are not appropriate, even where the species are closely related. These results suggest that future fuel loads and flammability at the landscape scale may change, requiring longitudinal, flexible and adaptive future fire management. Assessing the specific effects of distributional changes and the mechanisms driving different responses to climate change are highlighted as further research opportunities.

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Battaglia, M. "Seed Germination Model for Eucalyptus delegatensis Provenances Germinating under Conditions of Variable Temperature and Water Potential." Functional Plant Biology 24, no. 1 (1997): 69. http://dx.doi.org/10.1071/pp96040.

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This paper develops a population-based threshold model to describe the combined action of sub- and supra-optimal temperatures, water stress and the release of dormancy by cool-moist stratification on the germination of seeds of Eucalyptus delegatensis R.T. Baker. Separate models were fitted for seed samples collected from five climatically differing regions. The model presumes that the time to germination of a given seed fraction is inversely proportional to the difference between the actual level of a given germination factor and the factor threshold. The model then assumes that variation in this factor threshold within a seed population as a whole can be characterised by a normal, or log-normal, distribution. By using physiological time rather than clock time as a metric, the model was extended to describe germination under varying conditions in the field. A number of applications of the model were demonstrated. The correlation of model parameters with regional climate was tested and it was concluded that site temperature affected both the mean and variation in base population sensitivities to stratification-dose but that site rainfall affected only the mean base population sensitivity to water stress with all populations having a common variance. Examination of the model parameters relating to the release of dormancy indicated that the increased germination rate associated with stratification could be accounted for by progress towards germination made at stratifying temperatures. Finally, the model was used to examine the fundamental regeneration niche of E. delegatensis and it was concluded that abundant germination in the field could only be expected when the soil water potential is above –0.4 MPa and temperatures exceed 7.5°C. The model is presented as a flexible framework that allows for the prediction of field germination and as a useful tool for exploring seed germination processes, and the fundamental regeneration niche of the species. The modelling framework is easily modified to include additional factors and factor interactions applicable to other situations and species.

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Raymond, CA, CE Harwood, and JV Owen. "A Conductivity Method for Screening Populations of Eucalypts for Frost Damage and Frost Tolerance." Australian Journal of Botany 34, no. 4 (1986): 377. http://dx.doi.org/10.1071/bt9860377.

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The assessment of frost tolerance of Eucalyptus leaf tissue by an electrical conductivity method is described. Leaf disc samples were exposed to freezing treatments in test tubes within a liquid cold bath with precise temperature control, and the conductivity of the disc leachate measured. Leaf discs were then frozen at -20°C to obtain an absolute conductivity for the tissue. A modified relative conductivity value (RC*) is presented together with calibration against visual observations of leaf damage for seedlings of E. regnans and E. delegatensis. RC* was found to be a reliable indicator of leaf survival status and the RC*-damage relationship was constant across provenances of both species. Provenance and family variation for frost tolerance were examined for both species and significant differences in tolerance levels were found for unhardened E. delegatensis and for hardened seedlings of both species at several test temperatures. Provenance rankings were identical to results from field trials reported in the literature. The effect of the period between frost treatment and conductivity measurement was assessed together with variation between leaves of the same plant and the effect of storage of cut leaves for 24 h prior to exposure to frosting treatments. The absence of any significant effects from storing leaves for 24 h indicates the potential of using the method to screen samples collected in the field. Problems of relating RC*, leaf damage and survival of the whole plant are discussed and the potential use of RC* as a simple screening technique for identifying frost-tolerant families and provenances is examined.

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Kirschbaum, Miko U. F., Heather Keith, Ray Leuning, Helen A. Cleugh, Kris L. Jacobsen, Eva van Gorsel, and R. John Raison. "Modelling net ecosystem carbon and water exchange of a temperate Eucalyptus delegatensis forest using multiple constraints." Agricultural and Forest Meteorology 145, no. 1-2 (July 2007): 48–68. http://dx.doi.org/10.1016/j.agrformet.2007.04.002.

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29

Fest, Benedikt J., Stephen J. Livesley, Matthias Drösler, Eva van Gorsel, and Stefan K. Arndt. "Soil–atmosphere greenhouse gas exchange in a cool, temperate Eucalyptus delegatensis forest in south-eastern Australia." Agricultural and Forest Meteorology 149, no. 3-4 (March 2009): 393–406. http://dx.doi.org/10.1016/j.agrformet.2008.09.007.

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30

Wang, XJ, PJ Smethurst, and GK Holz. "Nitrogen mineralisation indices in ferrosols under eucalypt plantations of North-Western Tasmania: association with previous land use." Soil Research 34, no. 6 (1996): 925. http://dx.doi.org/10.1071/sr9960925.

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Potentially mineralisable N was studied in the laboratory and in the held in ferrosols from eucalypt plantations and pastures in north-western Tasmania. The plantation sites previously supported either Pinus radiata plantations (ex-pine), mixed eucalypt-myrtle forest (ex-mixed), or open Eucalyptus delegatensis forest with a grass understory (ex-dele). Ranges of concentrations of organic C and total N, and C to N ratio, were 6.9-13.6%, 0.297-0.978%, and 10.3-30.4, respectively. The concentration of organic C was independent of previous land use, but rankings for total N, anaerobically mineralisable N, and extractable N in hot KCl were pasture > to ex-dele = ex-mixed > ex-pine. The ratio C:N in theex-pine group (23.6) was higher than ratios in other groups (13.1-15.6). Anaerobically mineralisable N ranged from 49 to 214 �g/g, and was highly correlated with total N and extractable N in hot KCl at 95�C for 16 h (r = 0.83 for both cases, P < 0.001). The C:N ratio was negatively correlated with total N and anaerobically mineralisable N (r = 0.56 and 0.70, P < 0.01). The results indicated that the pasture soils had greater availability of mineral N, and that total N, C:N ratio, and anaerobically mineralisable N may provide useful information for assessing N mineralisation in these soils.

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Close, Dugald C., Neil J. Davidson, and Perry W. Swanborough. "Fire history and understorey vegetation: Water and nutrient relations of Eucalyptus gomphocephala and E. delegatensis overstorey trees." Forest Ecology and Management 262, no. 2 (July 2011): 208–14. http://dx.doi.org/10.1016/j.foreco.2011.03.025.

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Buckley, Thomas N., Tarryn L. Turnbull, Sebastian Pfautsch, Mana Gharun, and Mark A. Adams. "Differences in water use between mature and post-fire regrowth stands of subalpine Eucalyptus delegatensis R. Baker." Forest Ecology and Management 270 (April 2012): 1–10. http://dx.doi.org/10.1016/j.foreco.2012.01.008.

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Hallam, P. M., and W. N. Tibbits. "Determination of frost hardiness of Eucalyptus using the electrical conductivity of diffusate in conjunction with a freezing chamber." Canadian Journal of Forest Research 18, no. 5 (May 1, 1988): 595–600. http://dx.doi.org/10.1139/x88-086.

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An electrical conductivity method for determining frost hardiness of tissue discs punched from Eucalyptus leaves is described. Samples were exposed to convective heat loss in an air-filled chamber. Rates of cooling and desired frost temperatures were electronically controlled and maintained. Supercooling of tissue was effectively eliminated by addition of small amounts of AgI and water. Conductivity of diffusate was measured as a means of quantifying tissue damage following frost. Relative conductivity was determined with reference to subsequent measurements following heating the discs to 70 °C which resulted in maximum conductivity. Exposure of leaf discs to temperatures below the lethal temperature for these species (<−10 °C) resulted in similar maximum conductivity readings. The technique is evaluated to assess its potential to distinguish small differences in frost hardiness caused by genotype and environment. For both E. delegatensis and E. nitens there was no significant difference in frost hardiness expressed in terms of mean lethal temperature when comparing leaf discs with frosting whole seedlings.

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34

Florentine, S. K., P. Milberg, M. Gibson, and M. Westbrooke. "Post-wildfire seedling colonisation patterns in a Eucalyptus delegatensis (Myrtaceae) windthrow site at Snowy River National Park, Victoria." Australian Forestry 71, no. 1 (January 1, 2008): 48–53. http://dx.doi.org/10.1080/00049158.2008.10676270.

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35

Battaglia, M. "Effects of Seed Dormancy and Emergence Time on the Survival and Early Growth of Eucalyptus delegatensis and E. amygdalina." Australian Journal of Botany 44, no. 2 (1996): 123. http://dx.doi.org/10.1071/bt9960123.

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Seed of two tree species, Eucalyptus amygdalina Labill. and E. delegatensis R.T.Baker, was sown on 12 separate dates at two sites close to which both occurred. The species have parapatric distributions but form ecotonal stands. One site was harsh by comparison to the other. Recruitment, survival and growth were recorded at regular intervals following sowing and were related to temperature and soil moisture. The non-dormant seed fraction of both species responded similarly to environmental cues, with rapid emergence occurring when the mean daily temperature exceeded 6°C and the soil moisture index was below 30 mm. Differences in the pattern of emergence between the species resulted from differing degrees of seed dormancy. On the harsh site, spring emergence gave superior survival and growth than did autumn emergence. Consequently, spring emergents were dominant at the end of the experiment. At the milder of the two sites, little difference in survival or growth was observed between emergence times and consequently seedlings emerging in the autumn were dominant at the end of the experiment. Differences between the mortality rate of very young seedlings of each species were detected at some times of year. The combination of differences in seedling mortality, and patterns of emergence as a result of seed dormancy suggest that differences in the regeneration niche may act to reinforce species boundaries, and combined with spatial and temporal variation in regeneration conditions may promote coexistence in ecotonal stands.

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Schimleck, Laurence, Robert Evans, and Jugo Ilic. "APPLICATION OF NEAR INFRARED SPECTROSCOPY TO A DIVERSE RANGE OF SPECIES DEMONSTRATING WIDE DENSITY AND STIFFNESS VARIATION." IAWA Journal 22, no. 4 (2001): 415–29. http://dx.doi.org/10.1163/22941932-90000386.

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The application of near infrared (NIR) spectroscopy to a large number of mixed species that display extremely wide variations in wood chemistry, anatomy and physical properties, is described. The mixed species samples were characterized in terms of density, longitudinal modulus of elasticity and microfibril angle. NIR spectra were obtained from the radial / longitudinal face of each sample and used to generate calibrations for the measured physical properties. The calibrations developed for density and longitudinal modulus of elasticity had the highest coefficients of determination (R2) and demonstrated that it is possible to develop general calibrations for these important wood properties across a wide range of species.The mixed species calibrations were used to estimate wood properties of two species, Eucalyptus delegatensis R.T. Baker and Pinus radiata D.Don. The results obtained for density and longitudinal modulus of elasticity indicated that mixed species calibrations can be used to rank trees. In practice the extreme variation of samples selected for this study would not be required. It is expected that refinement of calibrations, through sample selection, would provide more accurate prediction of physical properties.

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Bowman, DMJS, and JB Kirkpatrick. "Establishment, Suppression and Growth of Eucalyptus delegatensis R.T. Baker In Multiaged Forests .III. Intraspecific Allelopathy, Competition Between Adult and Juvenile for Moisture and Nutrients, and Frost Damage to Seedlings." Australian Journal of Botany 34, no. 1 (1986): 81. http://dx.doi.org/10.1071/bt9860081.

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Field and pot experiments were designed to test the relative roles of allelopathy, competition for moisture and competition for nutrients in the suppression and growth of Eucalyptus delegatensis. In pot experiments litter cover was associated with slightly slower growth rates than in other treatments. A fertilization treatment was associated with increased growth rates in both trenched and untrenched situations in a field experiment, but the effect of fertilization was subdued in comparison with the effects of trenching or of total tree removal in the clear-felling treatment. Saplings and seedlings in the forest were under significantly greater moisture stress, as indicated by xylem pressure potential and stomata1 resistance, than those growing in the adjacent clear-felled areas. Surface soils in clear-felled areas had moisture contents above the level which caused seedling stress while surface soils within the forest were often below this level. These findings suggest that adult trees suppress seedling and sapling regrowth largely through their effect on soil moisture. However, another form of seedling growth suppression also occurs in the open as a result of frost damage.

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Davidson, NJ, and JB Reid. "Frost as a Factor Influencing the Growth and Distribution of Subalpine Eucalypts." Australian Journal of Botany 33, no. 6 (1985): 657. http://dx.doi.org/10.1071/bt9850657.

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An examination was made of the effect of natural frosts on pole stands of eucalypts growing within and surrounding a shallow depression at Snug Plains (alt. approx. 600 m) in south-eastern Tasmania. Marked differences in microclimate occurred between the slopes surrounding the depression and the base of the depression. The most severe frosts were experienced by the site at the base of the depression, and during a cold spell in June 1983 a record minimum temperature of - 22°C was recorded just above the radiating surface at this site. Pronounced vertical stratification of the air occurred (up to 9°C per m) and a difference in minimum temperature of 7.3°C was recorded over a distance of 200 m between a ridge-top site and the site at the base of the depression. Cooling rates of up to 6.5°C per h were recorded during these severe frosts. The effect of frost in determining the distribution of six local species of Eucalyptus was examined by comparing the damage caused to mixed pole stands of five of the six species by the cold spell in June 1983. The order of frost sensitivity for fully hardened pole stands from the most resistant to the most susceptible was E. gunnii > E. coccifera > E. johnstonii > E. delegatensis > E. pulchella. The natural distribution of these species was closely related to the minimum temperature recorded at the various sites. Intense frosts during June 1983 caused marked changes in the dominance of mixed stands even though relatively few individuals were completely killed. These results suggest that rare, exceptionally severe frosts may play an important role in determining the distribution of subalpine eucalypts.

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James, SH, and WJ Kennington. "Selection Against Homozygotes and Resource Allocation in the Mating System of Eucalyptus camaldulensis Dehnh." Australian Journal of Botany 41, no. 3 (1993): 381. http://dx.doi.org/10.1071/bt9930381.

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Allozyme genotypes of seed progeny were determined for an essentially self-pollinating individual of E. camaldulensis heterozygous at the LAP and GPI-2 loci. The seed exhibited a normal 1:1 allelic recovery, and an excess of heterozygotes relative to Mendelian expectations that was significant at the GPI-2 locus (χ2[1] = 58.0, P<0.001). GPI-2 allozyme genotypes were also determined for the seed produced by an open-pollinated E. camaldulensis growing in a mixed clonal plantation. Most of the seed produced by this plant exhibited non-maternal alleles and was the result of cross-pollination. We conclude that post-zygotic seed selection was selectively eliminating genetic homozygotes from the selfed progeny and amplifying the frequency of cross-pollination products in the open-pollinated tree. We also found that the level of selection within fruits of the self pollinated tree was dependent upon the number of seeds and the number of ovules per capsule (P=0.019, r2=0.63 and P=0.008, r2=0.79 respectively using pooled classed data); selection intensities were found to be greater in fruits containing lower numbers of seeds or ovules. This may reflect the level of resources allocated to the fruit by a hormonally controlled positive feedback system. Incorporating the notions of heterosis or selection against recessive homozygotes and resource allocation allowed the presentation of alternative explanations for the low estimates of î found in eucalyptus producing low numbers of flowers and for the temporal heterogeneity in outcrossing rates reported in E. delegatensis.

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Horton, Bryony M., Morag Glen, Neil J. Davidson, David A. Ratkowsky, Dugald C. Close, Tim J. Wardlaw, and Caroline Mohammed. "An assessment of ectomycorrhizal fungal communities in Tasmanian temperate high-altitude Eucalyptus delegatensis forest reveals a dominance of the Cortinariaceae." Mycorrhiza 27, no. 1 (August 22, 2016): 67–74. http://dx.doi.org/10.1007/s00572-016-0725-0.

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Volkova, Liubov, Huiquan Bi, James Hilton, and Christopher J. Weston. "Impact of mechanical thinning on forest carbon, fuel hazard and simulated fire behaviour in Eucalyptus delegatensis forest of south-eastern Australia." Forest Ecology and Management 405 (December 2017): 92–100. http://dx.doi.org/10.1016/j.foreco.2017.09.032.

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Emhart Schmidt, Verónica Ingrid, J. A. Celhay S., Edgardo Velilla, and Alex Medina. "Especies alternativas de Eucalyptus en la Región del Biobío. Resultados de crecimiento a los 14 años de edad." Ciencia & Investigación Forestal 19, no. 3 (July 12, 2013): 27–36. http://dx.doi.org/10.52904/0718-4646.2013.408.

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La producción comercial de especies de Eucalyptus en Chile está basada principalmente en E. globulus ssp globulus y E. nitens. Frente a nuevos desafíos de mercado y condiciones medioambientales, como la presencia de nuevas plagas o el cambio climático, es necesario tener otros materiales genéticos disponibles y evaluados en el patrimonio nacional. El presente estudio se estableció en predios de Forestal Mininco en el año 1997 en suelos trumaos y en rojo arcillosos con riego con la finalidad de evaluar productividad de otras especies de eucalipto alternativas a E. globulus ssp globulus y a E. nitens. Las especies probadas fueron E. badjensis, E. viminalis, E. smithii, E. cypellocarpa, E. urophylla, E. benthamii, E. camaldulensis, E. cinerea, E. delegatensis, E. globulus ssp globulus, E. globulus ssp pseudoglobulus, E. globulus ssp maidenii, E. nitens, Acacia mearnsii, Acacia dealbata y Casuarina equisetifolia. Después de 14 años de crecimiento, dentro de las especies con mayor volumen se encuentran E. badjensis con valores cercanos a los 776 y 887 m3, E. viminalis entre 645 y 760 m3, seguido por E. smithii con 542 y 765 m3 para ambas condiciones de sitio. E. globulus ssp globulus también presenta buenos crecimientos entre 610 a 572 m3, y E. nitens alcanza entre 493 y 603 m3 para las 2 condiciones de sitio. Dado estos resultados y a la edad del ensayo, el siguiente paso será corroborar las características de la madera para proyectar los productos, sean pulpables o sólidos o como biomasa.

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Kambouris, Peter J., Rodney P. Kavanagh, and Kelly A. Rowley. "Distribution, habitat preferences and management of the yellow-bellied glider, Petaurus australis, on the Bago Plateau, New South Wales: a reassessment of the population and its status." Wildlife Research 40, no. 7 (2013): 599. http://dx.doi.org/10.1071/wr13021.

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Context A population of yellow-bellied glider on the Bago Plateau, near Tumbarumba, was listed as an Endangered Population in 2008 under the New South Wales (NSW) Threatened Species Conservation Act 1995. The listing was based on limited data that suggested that the population is geographically and genetically distinct and its habitat in decline. Aims To review the validity of the endangered-population listing following the collection of new data on its distribution, habitat preferences and responses to logging. Methods Surveys for the yellow-bellied glider were conducted at a subset of sites established in 1995 on the Bago Plateau as well as across parts of the neighbouring Kosciuszko National Park, which had not been surveyed previously. The distribution of suitable habitat throughout these areas was evaluated. Key results The yellow-bellied glider was recorded at 29% of 48 sites resurveyed in 2010, 54% of which were previously occupied in 1995. Most changes in glider occupancy occurred at sites that had not been logged during the intervening period. The gliders preferred forest types dominated by montane gums (Eucalyptus dalrympleana, E. viminalis, E. camphora, E. pauciflora and E. stellulata) and used forest types of montane gums mixed with E. robertsonii or E. delegatensis in proportion to their availability across the landscape. The gliders were not observed to use monospecific stands of E. delegatensis. The yellow-bellied glider was also recorded frequently in Kosciuszko National Park. E. dalrympleana was consistently represented in the distribution of this species across the NSW Snowy Mountains. Conclusions Yellow-bellied glider site occupancy was not related to timber harvesting. Its habitat was not restricted by elevation or confined within Bago and Maragle State Forests by the Tumut River Gorge, Blowering and Talbingo Dams, as previously thought. We estimated that there is a large population of the gliders occupying up to 440 000 ha of contiguous habitat across the broader Snowy Mountains region of NSW, extending also into ACT and Victoria. Implications The listing of the Bago Plateau portion of this population as an endangered population appears inconsistent with relevant listing criteria and requires review.

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Gerwin, Melissa R., Rose Brinkhoff, Travis Britton, Meagan Porter, Ruth K. Mallett, and Mark J. Hovenden. "Testing the impact of community composition on the productivity of a cool temperate eucalypt forest: the Australian Forest Evenness Experiment (AFEX)." Australian Journal of Botany 68, no. 4 (2020): 310. http://dx.doi.org/10.1071/bt19131.

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Understanding the factors controlling productivity is crucial for modelling current and predicting future forest growth and carbon sequestration potential. Although abiotic conditions exert a strong influence on productivity, it is becoming increasingly evident that plant community composition can dramatically influence ecosystem processes. However, much of our understanding of these processes in forests comes from correlative studies or field experiments in short-statured, short-lived vegetation. Here, we present the background, design and implementation success of the Australian Forest Evenness Experiment (AFEX), which was designed to investigate the influence of community composition on the processes that contribute to forest productivity. Eighty 25 × 25-m plots, covering 5 ha in a logged, burnt forest coupe in south-eastern Tasmania were sown with four tree species, namely Eucalyptus delegatensis R.T.Baker, E. regnans F.Muell., Acacia dealbata Link and Pomaderris apetala Labill., in varying combinations to provide a range of evenness levels with each of the four species as target dominant. Despite some differences between sown composition and realised composition 1year after sowing, a substantial range of community evenness and local neighbourhood densities and compositions existed in the experiment. Thus, this site provides a unique opportunity to determine the influence of local neighbourhood composition on a range of ecological processes.

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Gessler, Arthur, Claudia Keitel, Naomi Kodama, Christopher Weston, Anthony J. Winters, Heather Keith, Kliti Grice, Ray Leuning, and Graham D. Farquhar. "δ13C of organic matter transported from the leaves to the roots in Eucalyptus delegatensis: short-term variations and relation to respired CO2." Functional Plant Biology 34, no. 8 (2007): 692. http://dx.doi.org/10.1071/fp07064.

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Post-photosynthetic carbon isotope fractionation might alter the isotopic signal imprinted on organic matter (OM) during primary carbon fixation by Rubisco. To characterise the influence of post-photosynthetic processes, we investigated the effect of starch storage and remobilisation on the stable carbon isotope signature (δ13C) of different carbon pools in the Eucalyptus delegatensis R. T. Baker leaf and the potential carbon isotope fractionation associated with phloem transport and respiration. Twig phloem exudate and leaf water-soluble OM showed diel variations in δ13C of up to 2.5 and 2‰, respectively, with 13C enrichment during the night and depletion during the day. Damped diel variation was also evident in bulk lipids of the leaf and in the leaf wax fraction. δ13C of nocturnal phloem exudate OM corresponded with the δ13C of carbon released from starch. There was no change in δ13C of phloem carbon along the trunk. CO2 emitted from trunks and roots was 13C enriched compared with the potential organic substrate, and depleted compared with soil-emitted CO2. The results are consistent with transitory starch accumulation and remobilisation governing the diel rhythm of δ13C in phloem-transported OM and fragmentation fractionation occurring during respiration. When using δ13C of OM or CO2 for assessing ecosystem processes or plant reactions towards environmental constraints, post-photosynthetic discrimination should be considered.

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Rodriguez-Cubillo, Dario, Lynda D. Prior, and David M. J. S. Bowman. "Variation in Eucalyptus delegatensis post-fire recovery strategies: The Tasmanian subspecies is a resprouter whereas the mainland Australian subspecies is an obligate seeder." Forest Ecology and Management 473 (October 2020): 118292. http://dx.doi.org/10.1016/j.foreco.2020.118292.

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47

Bassett, Owen D., Lynda D. Prior, Carolyn M. Slijkerman, Daniel Jamieson, and David M. J. S. Bowman. "Aerial sowing stopped the loss of alpine ash (Eucalyptus delegatensis) forests burnt by three short-interval fires in the Alpine National Park, Victoria, Australia." Forest Ecology and Management 342 (April 2015): 39–48. http://dx.doi.org/10.1016/j.foreco.2015.01.008.

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48

Bilney, Rohan J., Peter J. Kambouris, Jess Peterie, Craig Dunne, Kelly Makeham, Rodney P. Kavanagh, Leroy Gonsalves, and Brad Law. "Long-term monitoring of an endangered population of Yellow-bellied Glider Petaurus australis on the Bago Plateau, New South Wales, and its response to wildfires and timber harvesting in a changing climate." Australian Zoologist 42, no. 2 (April 1, 2022): 592–607. http://dx.doi.org/10.7882/az.2022.035.

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ABSTRACT A population of Yellow-bellied Glider Petaurus australis on the Bago Plateau, on the NSW south-western slopes, was first surveyed across 126 sites in 1995 and this subsequently became the baseline for further population monitoring. A subset of 48 sites was resurveyed in 2010, and about one third of the sites (~40) were surveyed annually on a rotating panel between 2013–2019. Wildfire significantly impacted the Bago Plateau during 2020 and 51 sites were resurveyed post-fire in 2020/21. An occupancy modelling approach was used to estimate trends in occupancy between 1995 and 2020/21, including the influence of various covariates. Initial occupancy was positively associated with the extent of Montane Gums and mixed Wet Peppermint/Montane Gum forest types within a 450 m radius of the survey site. Supported models revealed that colonisation over time was positively associated with the density of hollow-bearing trees at a site, while extinction was positively associated with the extent of high severity wildfire at a site. Despite wide confidence intervals, the long-term occupancy trend showed a stable to slight increase between 1995 and 2019, but a ~26% reduction following wildfire. The increasing trend occurred despite a long-term rainfall deficit that was punctuated by occasional above average years during the survey period. There was no evidence that timber harvesting influenced occupancy by the gliders, although harvesting is predominantly focused within stands containing Alpine Ash Eucalyptus delegatensis, with monospecific stands generally avoided by the glider.

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Gale, Matthew G., and Geoffrey J. Cary. "Stand boundary effects on obligate seeding Eucalyptus delegatensis regeneration and fuel dynamics following high and low severity fire: Implications for species resilience to recurrent fire." Austral Ecology 46, no. 5 (March 15, 2021): 802–17. http://dx.doi.org/10.1111/aec.13024.

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Balasso, Michelle, Andreja Kutnar, Eva Prelovšek Niemelä, Marica Mikuljan, Gregory Nolan, Nathan Kotlarewski, Mark Hunt, Andrew Jacobs, and Julianne O’Reilly-Wapstra. "Wood Properties Characterisation of Thermo-Hydro Mechanical Treated Plantation and Native Tasmanian Timber Species." Forests 11, no. 11 (November 10, 2020): 1189. http://dx.doi.org/10.3390/f11111189.

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Thermo-hydro mechanical (THM) treatments and thermo-treatments are used to improve the properties of wood species and enhance their uses without the application of chemicals. This work investigates and compares the effects of THM treatments on three timber species from Tasmania, Australia; plantation fibre-grown shining gum (Eucalyptus nitens H. Deane and Maiden), plantation saw-log radiata pine (Pinus radiata D. Don) and native-grown saw-log timber of the common name Tasmanian oak (which can be any of E. regnans F. Muell, E. obliqua L’Hér and E. delegatensis L’Hér). Thin lamellae were compressed by means of THM treatment from 8 mm to a target final thickness of 5 mm to investigate the suitability for using THM-treated lamellas in engineered wood products. The springback, mass loss, set-recovery after soaking, dimensional changes, mechanical properties, and Brinell hardness were used to evaluate the effects of the treatment on the properties of the species. The results show a marked increase in density for all three species, with the largest increase presented by E. nitens (+53%) and the smallest by Tasmanian oak (+41%). E. nitens displayed improvements both in stiffness and strength, while stiffness decreased in P. radiata samples and strength in Tasmanian oak samples. E. nitens also displayed the largest improvement in hardness (+94%) with respect to untreated samples. P. radiata presented the largest springback whilst having the least mass loss. E. nitens and Tasmanian oak showed similar dimensional changes, whilst P. radiata timber had the largest thickness swelling and set-recovery due to the high water absorption (99%). This study reported the effects of THM treatments in less-known and commercially important timber species, demonstrating that the wood properties of a fibre-grown timber can be improved through the treatments, potentially increasing the utilisation of E. nitens for structural and higher quality timber applications.

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Journal articles on the topic 'Eucalyptus delegatensis'

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