scholarly journals Changes in evapotranspiration components following replacement of Eucalyptus regnans with Acacia species

2017 ◽  
Vol 32 (2) ◽  
pp. 241-252
Author(s):  
Sandra N.D. Hawthorne ◽  
Richard G. Benyon ◽  
Patrick N.J. Lane
Keyword(s):  
Eucalyptus Regnans ◽  
Acacia Species

Role of Acacia Spp. In Nutrient Balance and Cycling in Regenerating Eucalyptus regnans F. Muell. Forests. I. Temporal Changes in Biomass and Nutrient Content

1984 ◽  
Vol 32 (2) ◽  
pp. 205 ◽  
Author(s):  
MA Adams ◽  
PM Attiwill
Keyword(s):  
Nutrient Balance ◽  
Nutrient Content ◽  
N Fixation ◽  
Eucalyptus Regnans ◽  
Acacia Species ◽  
Large Numbers ◽  
Calcium Magnesium ◽  
Slash Burning ◽  
Nutrient Conservation

Following severe fire in high-rainfall Eucalyptus regnans forests, several Acacia species may germinate in large numbers. Large amounts of nitrogen, calcium, magnesium and potassium are immobilized in the Acacia biomass, much of which is returned to the soil after canopy closure. Within 3 years of a regeneration burn, 280 kg N ha-1 was in the above-ground Acacia biomass and litter layer. The relative abundance of nitrogen in Acacia spp. is a result of N fixation. The probable rate of N fixation appears significant in relation to losses of nitrogen associated with slash-burning. It is concluded that the Acacia spp. may be important in the secondary succession through nutrient conservation, replacement and redistribution.

The effect of season of growth on the chemical composition of cambial saps of Eucalyptus regnans trees

Oecologia ◽  
1973 ◽  
Vol 12 (4) ◽  
pp. 349-372 ◽  
Author(s):  
C. M. Stewart ◽  
J. F. Melvin ◽  
N. Ditchburne ◽  
S. H. Tham
Keyword(s):  
Chemical Composition ◽  
Eucalyptus Regnans

Factors affecting post-fire seedling establishment of selected mallee understorey species

2000 ◽  
Vol 48 (1) ◽  
pp. 59 ◽  
Author(s):  
J. S. Cohn ◽  
R. A. Bradstock
Keyword(s):  
Large Scale ◽  
Prescribed Burning ◽  
New South ◽  
Eucalyptus Species ◽  
Factors Affecting ◽  
Acacia Species ◽  
Introduced Herbivores ◽  
South Wales ◽  
Rabbit Grazing ◽  
Seedling Germination

Factors affecting the survival of post-fire germinants in mallee communities, in central western New South Wales, were examined. Experiments compared the relative effects of native and introduced herbivores (kangaroos, goats, rabbits), after small- and large-scale fires (20–50 and > 10 000 ha, respectively), with particular emphasis on edge effects, seedling clustering, topography and eucalypt canopy presence. The experiments (1985–1997) focused on common understorey species Acacia rigens Cunn. ex Don, A. wilhelmiana F.Muell. and Triodia scariosa N.T.Burb. subsp. scariosa, in mallee dominated by Eucalyptus species. Following a large fire (1985), high spring rainfall and rabbit grazing on A. rigens only, survival of Acacia species and T. scariosa remained relatively high 4 years later (60–70%). After small burns (1987, 1988), low spring rainfall and grazing by rabbits and kangaroos, survival of Acacia species declined to between 0 and 30% of the germinants by the second summer. In most cases, local extinction had occurred within 8 years. After small burns (1988, 1989) and low spring rainfall, the survival of T. scariosa declined to between 0 and 35% of germinants by the second summer (effect of grazing unknown). No consistent effect of edge, topography and eucalypt canopy was found. Survival of clustered Acacia seedlings was between 10 and 20% lower than unclustered seedlings. Given the high frequency of low rainfall and its interaction with grazing, prescribed burning of mallee for wildfire control and nature conservation may require the local elimination of rabbits and a reduction in kangaroo numbers, especially in the first spring and summer following seedling germination.

scholarly journals Precipitation of Calcium, Magnesium, Strontium and Barium in Tissues of Four Acacia Species (Leguminosae: Mimosoideae)

PLoS ONE ◽  
2012 ◽  
Vol 7 (7) ◽  
pp. e41563 ◽  
Author(s):  
Honghua He ◽  
Timothy M. Bleby ◽  
Erik J. Veneklaas ◽  
Hans Lambers ◽  
John Kuo
Keyword(s):  
Acacia Species ◽  
Calcium Magnesium

Temperature and moisture content behaviour in microwave heated wood prior to bending – Mountain Ash (Eucalyptus regnans)

2008 ◽  
Vol 67 (2) ◽  
pp. 237-239 ◽  
Author(s):  
Beat Studhalter ◽  
Barbara Ozarska ◽  
Graeme Siemon
Keyword(s):  
Moisture Content ◽  
Eucalyptus Regnans ◽  
Mountain Ash

Reproductive success of Acacia longifolia (Fabaceae, Mimosoideae) in native and invasive populations

2015 ◽  
Vol 63 (5) ◽  
pp. 387 ◽  
Author(s):  
Marta Correia ◽  
Sílvia Castro ◽  
Susana Rodríguez-Echeverría
Keyword(s):  
Reproductive Success ◽  
Seed Size ◽  
Fruit Set ◽  
Lower Number ◽  
Open Pollination ◽  
Native Range ◽  
Reproductive Assurance ◽  
Acacia Species ◽  
Self Compatibility ◽  
Selfing Ability

The reproductive biology of exotic species affects their capacity to become naturalised and invasive in non-native areas. Selfing is a common trait in many invasive plants probably because it provides reproductive assurance under low availability of pollination vectors and sexual partners. Nonetheless, the predominantly self-incompatible Australian Acacia species are among the most aggressive plants worldwide. To address whether there have been changes in selfing ability and natural reproductive success of A. longifolia during invasion, we compared one population in the invaded area (Portugal) with one population in the native range (Australia). We specifically assessed floral traits, fruit set and offspring traits for selfing and open-pollination treatments. Within each pollination treatment, no differences were found between areas, suggesting that the level of self-compatibility has not changed during invasion. However, the number of aborted seeds and seed size were significantly different between pollination treatments in Australia but not in Portugal. There were significant differences in the number of seeds per pod and in seed weight between ranges. A lower number of aborted seeds, a higher number of fully developed seeds and a greater seed size were found in the invaded area for both pollination treatments. In spite of the low selfing ability of A. longifolia in the invaded area, there was an increase in the quantity and size of the seeds produced in the new region, even for self-pollinated fruits, which might contribute to A. longifolia invasiveness.

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