Water Relations of Rural Eucalypt Dieback.

1988 ◽  
Vol 36 (2) ◽  
pp. 233 ◽  
Author(s):  
DS Crombie ◽  
JA Milburn
Keyword(s):  
Disease Severity ◽  
Water Relations ◽  
New South ◽  
New South Wales ◽  
Leaf Water ◽  
Eucalyptus Species ◽  
Water Potentials ◽  
South Wales ◽  
Individual Trees

The water relations of healthy and dieback-affected individuals of three Eucalyptus species typical of the northern tablelands of New South Wales were compared. Dawn water potentials of healthy and dieback-affected trees were all very similar. Midday water potentials of trees with the most severe dieback symptoms were often lower than those of nearby healthy trees by up to 0.6 MPa. Leaf con- ductances of the most severely dieback-affected trees were usually greater than those of healthy trees. Differences decreased with time and when more trees with less severe symptoms were measured late in the study no significant differences in water relations were found. It seems therefore that the effects of dieback on the water relations of trees are too small for measurements of leaf water potentials or leaf conductances to be useful indicators of disease severity in individual trees.

Bunch covers, leaf number and yield of bananas

1970 ◽  
Vol 10 (47) ◽  
pp. 802 ◽  
Author(s):  
DW Turner
Keyword(s):  
Water Relations ◽  
New South ◽  
New South Wales ◽  
Leaf Length ◽  
Leaf Number ◽  
South Wales ◽  
North Eastern ◽  
Number Of Leaves ◽  
The Relationship

The effects of plastic bunch covers and varying defoliation treatments on bunch weight were measured on Williams bananas at Alstonville in north-eastern New South Wales. Bunch covers did not significantly affect bunch weight. The number of leaves left on the plant at bunch emergence only reduced yield when less than four leaves were present. Leaf length duration was calculated and was positively related to bunch weight. Bunch covers did not alter the relationship between leaf number and yield. The rate of sucker growth and water relations within the plants were altered by defoliation treatments. Both of these effects were greatest when less than three leaves were left on the plant.

The tree species preferences of koalas (Phascolarctos cinereus) inhabiting forest and woodland communities on Quaternary deposits in the Port Stephens area, New South Wales

2000 ◽  
Vol 27 (1) ◽  
pp. 1 ◽  
Author(s):  
Stephen Phillips ◽  
John Callaghan ◽  
Valerie Thompson
Keyword(s):  
Tree Species ◽  
New South ◽  
New South Wales ◽  
Eucalyptus Species ◽  
Quaternary Deposits ◽  
Faecal Pellets ◽  
South Wales ◽  
Species Preferences ◽  
Woodland Communities ◽  
Port Stephens

An assessment of the tree species preferences of koalas inhabiting forest and woodland communities growing on Quaternary deposits in the Port Stephens area, New South Wales, was undertaken between November 1994 and March 1996. Using a plot-based methodology, 3847 trees were sampled, comprising 15 Eucalyptus species and 17 species of non-eucalypt. Evidence of tree use by koalas, specifically the presence of koala faecal pellets, was recorded from beneath 10 Eucalyptus species and 9 species of non-eucalypt. Tree species preferences were determined by analyses of log- likelihood ratios derived from data based on the presence/absence of koala faecal pellets, rather than on gross counts. This approach confirmed significant variation in the levels of utilisation amongst and between different tree species, and that two in particular – swamp mahogany (E. robusta) and drooping red gum (E. parramattensis) – were most preferred. Increases in the levels of use of other tree species were also positively associated with the presence of E. robusta and/or E. parramattensis. Levels of utilisation of E. robusta and E. parramattensis did not alter significantly in response to changes in their respective densities, suggesting that the relative abundance of both was important in terms of understanding the carrying capacity of vegetation communities utilised by koalas. The results have established the success with which an enumerative approach to the interpretation of faecal pellet data can be utilised to clarify the tree species preferences of koalas. Application of the approach for habitat assessment and mapping purposes is also discussed.

Water relations of selected wallum species in dry sclerophyll woodland on the lower north coast of New South Wales, Australia

2013 ◽  
Vol 61 (4) ◽  
pp. 254 ◽  
Author(s):  
Susan Rutherford ◽  
Stephen J. Griffith ◽  
Nigel W. M. Warwick
Keyword(s):  
Water Relations ◽  
Growth Form ◽  
New South ◽  
New South Wales ◽  
Eastern Coast ◽  
North Coast ◽  
Groundwater Extraction ◽  
Xylem Water Potential ◽  
South Wales ◽  
Volume Curve

The present study examined the water relations of wallum dry sclerophyll woodland on the lower north coast of New South Wales (NSW). Wallum is the regionally distinct vegetation of Quaternary dunefields and beach ridge plains along the eastern coast of Australia. Wallum sand masses contain large aquifers, and previous studies have suggested that many of the plant species may be groundwater dependent. However, the extent of this dependency is largely unknown, despite an increasing reliance on the aquifers for groundwater extraction. Fifteen species from five growth-form categories and seven plant families were investigated. The pre-dawn and midday xylem water potential (ψx) of all species was monitored over a 20-month period from December 2007 to July 2009. Pressure–volume curve traits were determined for each species in late autumn 2008, including the osmotic potential at full (π100) and zero (π0) turgor, and bulk modulus of elasticity (ε). Carbon isotope ratios (δ13C) were determined in mid-autumn 2008 to measure water use efficiency (WUE). Comparative differences in water relations could be loosely related to growth forms. A tree (Eucalyptus racemosa subsp. racemosa) and most large shrubs had low midday ψx, π100 and π0, and high ε and WUE; whereas the majority of small and medium shrubs had high midday ψx, π100 and π0, and low ε and WUE. However, some species of similar growth form displayed contrasting behaviour in their water relations (e.g. the herbs Caustis recurvata var. recurvata and Hypolaena fastigiata), and such differences require further investigation. The results suggest that E. racemosa subsp. racemosa is likely to be groundwater dependent, and large shrubs such as Banksia aemula may also utilise groundwater. Both species are widespread in wallum, and therefore have the potential to play a key role in monitoring ecosystem health where aquifers are subject to groundwater extraction.

scholarly journals Susceptibility of provenances of spotted gums to Ramularia shoot blight

2002 ◽  
Vol 55 ◽  
pp. 68-72 ◽  
Author(s):  
N.M. Self ◽  
E.A.B. Aitken ◽  
M.D. Dale
Keyword(s):  
Disease Susceptibility ◽  
New South ◽  
New South Wales ◽  
Field Conditions ◽  
Eucalyptus Species ◽  
Major Disease ◽  
Resistant Species ◽  
South Wales ◽  
Shoot Blight ◽  
Eucalyptus Maculata

Shoot blight of spotted gums (Eucalyptus maculata Hook E citriodora Hook and E henryi ST Blake) caused by Ramularia pitereka Unger has recently emerged as the major disease problem of spotted gum plantations in Queensland and Northern New South Wales A difference in disease susceptibility was demonstrated between provenances of spotted gums inoculated with Ramularia spores under field conditions A number of other Eucalyptus species inoculated with Ramularia showed no susceptibility The potential for breeding from resistant provenances and for creating resistant hybrids using crosses with resistant species such as Eucalyptus torelliana FMuell is discussed

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