Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 199.
  1. Library Resource
    Articles et Livres
    décembre, 2013
    Australie

    Atmospheric correction of high spatial resolution (10–30 m pixel sizes) satellite imagery for use in large-area land-cover monitoring is difficult due to the lack of aerosol optical depth (AOD) estimates made coincident with image acquisition. We present a methodology to determine the upper and lower bounds of AOD estimates that allow the subsequent calculation of a biophysical variable of interest to a pre-determined precision. Knowledge of that range can be used to identify an appropriate method for estimating AOD.

  2. Library Resource
    Articles et Livres
    décembre, 2013
    Australie

    Numerous land-cover change detection techniques have been developed with varying opinions about their appropriateness and success. Decisions on the selection of the most suitable change detection method is often influenced by the study region landscape complexity and the type of data used for analysis. For different climatic areas, the method that suits best the seasonal land-cover change identification remains uncertain.

  3. Library Resource
    Articles et Livres
    décembre, 2010
    Australie

    This paper reviews the legislation relating to ownership of feral camels in Australia. We find that, as a general proposition, a feral camel is owned by neither the landowner nor the Government (the Crown), unless State or Territory legislation provides otherwise. This occurs in two limited situations and only for New South Wales and South Australia. Relevant State and Territory legislation can prescribe that feral camels cannot be taken or used without a relevant licence or permit, but only Western Australia and Queensland appear to do this.

  4. Library Resource
    Articles et Livres
    décembre, 2010
    Australie

    Encroachment or densification by woody plants affects natural ecosystems around the world. Many studies have reported encroachment in temperate Australia, particularly in coastal ecosystems and grassy woodlands. However, the degree to which published studies reflect broad-scale changes is unknown because most studies intentionally sampled areas with conspicuous densification.

  5. Library Resource
    Articles et Livres
    décembre, 2012
    Australie

    Most of the plantation impact studies reported in literature normally use either one of the sensitivity-based approach or a hydrological model with few actually comparing the impact results from these different approaches. This paper investigates the impacts of increase or decrease in plantations and climate variability on streamflow using two approaches: the sensitivity-based approach (including a non-parametric model and six Budyko framework based models) and the hydrological modelling approach (using Xinanjiang and SIMHYD models) for three medium sized catchments in Australia.

  6. Library Resource
    Articles et Livres
    décembre, 2014
    Australie

    Adaptation in agro-ecological systems will be important for moderating the impacts of climate change. Vulnerability assessments provide the basis for developing strategies to reduce social vulnerability and plan for climate adaptation. Primary industries have been identified as the most vulnerable industry sector globally. We review how primary producers might be socially vulnerable to climate change and develop a ‘vulnerability typology’ of cattle producers based on survey responses from 240 producers across northern Australia.

  7. Library Resource
    Articles et Livres
    décembre, 2016
    Australie

    Monitoring changes in the terrestrial carbon cycle and vegetation health can only be undertaken over large areas and on a regular basis using ecological indicators derived from satellite-based sensors. Climate conditions in Mediterranean ecosystems have undergone, and are projected to undergo, significant change in the future with marked impacts on forest and shrubland vegetation. In the southwest of Australia (SWAU), endemic tree species have experienced significant declines in health and mortality since the early 1990s primarily due to these climatic changes.

  8. Library Resource
    Articles et Livres
    décembre, 2015
    Australie, Nouvelle-Zélande, Europe

    In New Zealand and Australia, rural landowners believe that local predator control to protect indigenous biota exacerbates European rabbit Oryctolagus cuniculus problems on their land. We assess the validity of their concerns by reviewing the published literature on effects of predators on rabbit abundance. In New Zealand, where rabbits and their predators are introduced, predators appear to have relatively little effect on rabbit numbers compared with other factors leading to mortality, such as disease, flooding of burrows and burrow collapse.

  9. Library Resource
    Articles et Livres
    décembre, 2013
    Australie, Europe, Amérique septentrionale

    The environmental consequences of agriculture are of growing concern. One example of these consequences is the effect of agricultural pollutants on the Great Barrier Reef (GBR), a world heritage-listed ecosystem lying off the tropical north-eastern coast of Australia. Pollutants from agricultural lands (fine sediments and attached nitrogen (N) mainly from grazing lands, and dissolved N and pesticides mainly from cropping) in catchments draining into the GBR lagoon threaten the health and resilience of this ecosystem.

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