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Resultados de la búsqueda

Mostrando ítems 1 a 9 de 156.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    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.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    CONTEXT: Tropical forest regeneration is increasingly prominent as agro-pastoral lands are abandoned. Regeneration is characterised as favouring ‘marginal’ lands; however, observations of its drivers are often coarse or simple, leaving doubt as to spatial dynamics and causation. OBJECTIVES: We quantified the spatial dynamics of forest regeneration relative to marginality and remnant forest cover in a 3000 km² pastoral region in northern tropical Australia.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    Private landholders’ contributions to biodiversity conservation are critical in landscapes with insufficient formal conservation reserves, as is the case in Australia's tropical savannas. This study reports results from a discrete choice experiment conducted with pastoralists and graziers across northern Australia. The experiment was designed to explore the willingness of pastoralists and graziers to sign up to voluntary biodiversity conservation contracts. Understanding preferences for contractual attributes and preference heterogeneity were additional objectives.

  4. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    Ash is generated in every wildfire, but its eco-hydro-geomorphic effects remain poorly understood and quantified, especially at large spatial scales. Here we present a new method that allows modelling the spatial distribution of ash loads in the post-fire landscape, based on a severe wildfire that burnt ~13600ha of a forested water supply catchment in October 2013 (2013 Hall Road Fire, 100km south-west of Sydney, Australia). Employing an existing spectral ratio-based index, we developed a new spectral index using Landsat 8 satellite imagery: the normalised wildfire ash index (NWAI).

  5. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    Native vegetation around the world is under threat from historical and ongoing clearance, overgrazing, invasive species, increasing soil and water salinity, altered fire regimes, poor land management and other factors, resulting in a degradation of natural ecosystem services. Consequently, maintaining and improving native vegetation condition is a target frequently adopted by natural resource managers and government agencies world-wide. Adequate monitoring of vegetation condition remains a prerequisite for environmental decision-making and for tracking progress towards management goals.

  6. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    Hollow-bearing trees provide habitat for diverse taxonomic groups and as such they are recognised for their importance globally. There is, however scant reference to this resource relative within urban forest patches. The functional ecology of habitat remnants along an urbanisation gradient plays an important ecological, social and economic role within urban landscapes. Here we quantify the impacts of urbanisation, landscape, environmental, disturbance (past and present) and stand variables on hollow-bearing tree density within urban forest patches.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    Reports of positive or neutral effects of grazing on plant species richness have prompted calls for livestock grazing to be used as a tool for managing land for conservation. Grazing effects, however, are likely to vary among different response variables, types, and intensity of grazing, and across abiotic conditions. We aimed to examine how grazing affects ecosystem structure, function, and composition. We compiled a database of 7615 records reporting an effect of grazing by sheep and cattle on 278 biotic and abiotic response variables for published studies across Australia.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Australia

    Within current rural research, an ongoing challenge has been to conceptualise the overarching dynamics driving rural transitions in affluent societies, while also recognising diversity and complexity in driving forces and trajectories over time and place. While amenity migration may continue to be influential, more recent research has revealed that there are multiple driving forces leading towards diverse multifunctional rural occupance modes and trajectories.

  9. Library Resource
    Artículos de revistas y libros
    Diciembre, 2016
    Nueva Zelandia

    In Aotearoa New Zealand Māori land is often owned by communities and managed by trusts. Under communal ownership, trust managers are expected to provide for their communities in culturally responsive ways, using alternative land-related paradigms. In the context of Māori trust rural land management, geographic information systems (GIS) are seen as a beneficial resource to plan and support important decisions that have community-wide implications.

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