Relevant bibliographies by topics / Harpophylla

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  2. Dissertations / Theses

Academic literature on the topic 'Harpophylla'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Harpophylla"

1

Dwyer, John M. "Reproductive size thresholds and seedling survival in Acacia harpophylla (Mimosaceae)." Australian Journal of Botany 65, no. 5 (2017): 438. http://dx.doi.org/10.1071/bt17051.

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Acacia harpophylla F.Muell. ex Benth. (brigalow) forests and woodlands formerly occupied at least 8.7 M ha of Queensland and New South Wales, but less than 10% persists in isolated fragments and linear strips within a matrix of exotic beef pasture and dryland cropping. Given the relatively rapid and widespread clearing of brigalow forests, recent research has focussed on restoration via naturally resprouting vegetation. However, our understanding of A. harpophylla sexual reproduction and seedling recruitment remains poor. This study, undertaken following a widespread masting event in late 2007, aimed to (1) quantify initial densities of A. harpophylla germinants; (2) estimate subsequent seedling survival during the first year; and (3) determine minimum size thresholds for sexual reproduction in A. harpophylla. Initial densities averaged >46 000 seedlings ha–1, but only 438 seedlings ha–1 (<1%) were estimated to remain after a year. Although mortality was high, seedling recruitment is probably still sufficient to replace senescing stems and augment population genetic diversity to some extent. A reproductive size threshold of 10 cm diameter was identified, providing useful information to predict when naturally resprouting stands will begin to participate in masting events.
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2

SCANLAN, J. C. "Woody overstorey and herbaceous understorey biomass in Acacia harpophylla (brigalow) woodlands." Austral Ecology 16, no. 4 (December 1991): 521–29. http://dx.doi.org/10.1111/j.1442-9993.1991.tb01081.x.

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3

Dwyer, John M., and Riah Mason. "Plant community responses to thinning in densely regenerating Acacia harpophylla forest." Restoration Ecology 26, no. 1 (May 29, 2017): 97–105. http://dx.doi.org/10.1111/rec.12536.

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4

Reichman, S. M., S. M. Bellairs, and D. R. Mulligan. "The effects of temperature and salinity on Acacia harpophylla (brigalow) (Mimosaceae) germination." Rangeland Journal 28, no. 2 (2006): 175. http://dx.doi.org/10.1071/rj06027.

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Acacia harpophylla F. Muell. (brigalow) used to naturally occur over a range of about 50 000 km2 in Queensland and New South Wales, Australia. Large scale clearing for agriculture has reduced the area to less than 20 000 km2 and it is estimated that 20–25% of vertebrate fauna living in brigalow communities will become locally extinct as a result of the current clearing induced loss of habitat. Some coal mining companies in central Queensland have become interested in providing habitat for the endangered bridle nail-tailed wallaby that lives in brigalow vegetation. However, there is little known about establishment techniques for brigalow on mine sites and other disturbed ground; an understanding of brigalow biology and ecology is required to assist in the conservation of this threatened vegetation community and for re-creation of bridled nail-tail wallaby habitat in the post mining landscape. Brigalow is an unusual species of Acacia because it is not hard-seeded and germinates readily without the need to break seed-coat imposed dormancy. Germination trials were undertaken to test the ability of brigalow seed to germinate with a range of temperatures and salinity levels similar to those experienced in coal mine spoil. Optimum germination was found to occur at temperatures from 15 to 38°C and no germination was recorded at 45°C. Brigalow was very tolerant of high salt levels and germinated at percentages greater than 50% up to the highest salinity tested, 30 dS/m. Germination of greater than 90% occurred up to an electrical conductivity of 20 dS/m. The results indicate brigalow seed can be sown in summer when rains are most likely to occur, however, shading of the seed with extra soil or mulch may ensure the ground surface does not become too hot for germination. Because of its ability to germinate at high salinity levels, brigalow may be suitable for use in saline mine wastes which are common on sites to be rehabilitated after mining.
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Kaur, K., R. K. Jalota, D. J. Midmore, and J. Rolfe. "Pasture production in cleared and uncleared grazing systems of central Queensland, Australia." Rangeland Journal 27, no. 2 (2005): 143. http://dx.doi.org/10.1071/rj05012.

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Clearing land of trees and introducing exotic pastures to enhance pasture and cattle production and hence enterprise financial performance are widely practised in Queensland. The results from many previous studies on tree clearing have emphasised the gains in pasture production, but over periods of less than 10–15 years after clearing. The present study questioned the sustainability of pasture production in cleared systems over a longer time-frame (>10 years of clearing). For this, three different age groups of clearing i.e. 5 year, 11–13 year and 33 year were selected in each of 3 major types of tree communities i.e. Eucalyptus populnea, E. melanophloia and Acacia harpophylla in central Queensland. Paired comparisons of cleared and uncleared (intact) pasture systems were selected for each age group of clearing. The results suggest that the initial gains in pasture production upon clearing were compatible with published studies. However, for longer periods of time since clearing, the gains in pasture production were not sustained and were accompanied by risks of land degradation and loss of pasture plant diversity. For E. populnea and A. harpophylla, the maximum benefits from clearing were achieved at 13–15 years whereas for E. melanophloia, any benefits existed only over a short period of 5–6 years. The study emphasises that each tree community exhibits a specific response with regard to the duration of increased pasture production following clearing. To estimate the total benefits from tree clearing in pasture development, it is important to consider both monetary benefits and non-monetary losses from clearing for different types of tree communities.
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6

Eastwood, Rod, Michael F. Braby, Daniel J. Schmidt, and Jane M. Hughes. "Taxonomy, ecology, genetics and conservation status of the pale imperial hairstreak (Jalmenus eubulus) (Lepidoptera:Lycaenidae): a threatened butterfly from the Brigalow Belt, Australia." Invertebrate Systematics 22, no. 4 (2008): 407. http://dx.doi.org/10.1071/is06028.

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The taxonomic status of Jalmenus eubulus Miskin stat. rev. is revised and considered to be specifically distinct from J. evagoras (Donovan) based on fundamental differences in morphology, ecology and genetics. Miskin’s holotype is fixed by monotypy and illustrated, with type locality Rockhampton, Queensland. Fixed differences in the mitochondrial genomes of J. eubulus and J. evagoras in which the mean pairwise divergence is only 0.85% indicate absence of matrilineal gene flow, whereas allozyme data show significant structure within and between populations of both species consistent with recent diversification. Underlying causes for the observed genetic patterns are investigated. The two species are parapatric, with a narrow range of overlap along the Great Escarpment in south-eastern Queensland. Jalmenus eubulus is restricted to vegetation communities comprising brigalow-dominated old-growth open-forests and woodlands in the Brigalow Belt (with larvae monophagous on Acacia harpophylla F. Muell. Ex Benth), whereas J. evagoras occurs in a range of disturbed eucalypt woodlands/open-forests predominantly in montane and coastal areas east of this bioregion (with larvae polyphagous on Acacia species other than A. harpophylla). The conservation status of J. eubulus is considered to be vulnerable nationally and critically endangered in New South Wales according to International Union for Conservation of Nature (IUCN) criteria. Nationally, the geographic range has an estimated area of occupancy of less than 2000 km2, is severely fragmented, and the extent or quality of its habitat, which is poorly conserved, continues to decline. It is recommended that the taxon be used as an indicator for identification of remnant old-growth forest for conservation planning, as well as a flagship for the conservation of invertebrate biodiversity associated with this threatened ecological community.
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7

Thornton, C. M., B. A. Cowie, D. M. Freebairn, and C. L. Playford. "The Brigalow Catchment Study: II. Clearing brigalow (Acacia harpophylla) for cropping or pasture increases runoff." Soil Research 45, no. 7 (2007): 496. http://dx.doi.org/10.1071/sr07064.

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The Brigalow Catchment Study (BCS) was established to determine the impact on hydrology when brigalow land is cleared for cropping and grazing. The paired catchment study was commenced in 1965 using catchments of approximately 15 ha, with natural vegetation dominated by brigalow scrub (Acacia harpophylla). Three contiguous catchments were selected near Theodore in central Queensland to represent the extensive brigalow bioregion of central and southern Queensland and northern New South Wales (~40 Mha). The hydrology of the 3 catchments was characterised during a 17-year calibration period (1965–81). The catchments were considered hydrologically similar, with sufficient data available for an empirical comparison between catchments. In 1982, two of the catchments were cleared, with one developed for cropping and the other sown to improved pasture. The third catchment was used as an uncleared control. Hydrologic characteristics were then compared for the following 21 years. In their virgin state, the catchments behaved similarly, with average annual runoff being 5% of annual rainfall. Once cleared, total runoff from the cropping catchment increased to 11% of annual rainfall and total runoff from the pasture catchment increased to 9% of annual rainfall; however, timing of the individual runoff events varied between land uses. In order to confirm that changes in hydrology were a function of land use and not just seasonal variability or sampling error, several analytic techniques were used: a simple comparison of runoff totals, comparison of events, comparison of probability of exceedance for daily runoff, and comparison of predicted and observed runoff using a water balance modelling approach.
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Johnson, Robert W., William J. McDonald, Roderick J. Fensham, Clive A. McAlpine, and Michael J. Lawes. "Changes over 46 years in plant community structure in a cleared brigalow (Acacia harpophylla) forest." Austral Ecology 41, no. 6 (April 22, 2016): 644–56. http://dx.doi.org/10.1111/aec.12354.

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9

Le Brocque, Andrew F., and Peter M. Wagner. "Passive brigalow (Acacia harpophylla) woodland regeneration fails to recover floristic composition in an agricultural landscape." Austral Ecology 43, no. 4 (February 6, 2018): 409–23. http://dx.doi.org/10.1111/aec.12578.

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10

Machado, Paulo Fernando Dos Santos, José Newton Cardoso Marchiori, and Anelise Marta Siegloch. "Anatomia da madeira de seis espécies exóticas do gênero Acacia Mill. (Fabaceae)." Balduinia, no. 49 (August 24, 2015): 01. http://dx.doi.org/10.5902/2358198019214.

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As madeiras de Acacia acuminata A. Gray, Acacia cambagei R.T. Baker, Acacia harpophylla F. Muell. Ex Benth., Acacia koa A. Gray, Acacia rhodoxylon Maiden e Acacia richii A. Gray são anatomicamente descritas e ilustradas com fotomicrografias. Todas as seis espécies apresentam os seguintes caracteres de ampla ocorrência em Fabaceae: porosidade difusa; placas de perfuração simples; elementos vasculares com pontoações ornamentadas; parênquima paratraqueal; raios homogêneos; e fibras libriformes não septadas. O último destes caracteres permite distinguir as mesmas do gênero Senegalia Raf., segregado de Acacia Mill. em 2005. Por sua vez, a ausência de grandes raios conspícuos, juntamente com a abundância de séries parenquimáticas axiais com mais de três células de altura, permitem excluir as seis espécies do gênero Vachellia Wight & Arn
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Dissertations / Theses on the topic "Harpophylla"

1

Collard, Stuart J. "Agricultural intensification and ecosystem function in a brigalow (Acacia harpophylla)landscape: implications for ecosystem services." University of Southern Queensland, Faculty of Sciences, 2007. http://eprints.usq.edu.au/archive/00003557/.

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[Abstract]: Agricultural intensification, involving habitat fragmentation and modification, typically leads to a decline in biodiversity and ecosystem function. While most studies concentrate on remnant patches, the less intensively managed components of agricultural landscapes may also provide biodiversity values and ecosystem services. This study examines the contribution of different categories of land management to biodiversity and ecosystem function along a gradient of agricultural intensification. Differences within these land management categories are also examined. Research results are interpreted in the broad context of ecosystem services and their resilience in agro-ecosystems.
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