Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 26.
  1. Library Resource
    Articles et Livres
    décembre, 2007
    Australie

    Offsets (also known as mitigation banks, compensatory habitat, set-asides) is a policy instrument recently introduced in several States in Australia to permit some land clearing while striving for no net loss in the extent and condition of native vegetation overall. Offsetting is criticized with respect to the amount of gain required to compensate for losses from clearing, the equivalence of losses and gains, the time lag between losses and gains and a poor record of compliance.

  2. Library Resource
    Articles et Livres
    décembre, 2015
    Australie

    AIM: Prescribed fire is a common land management for reducing risks from unplanned fires. However, the universality of such effectiveness remains uncertain due to biogeographical variation in fuel types, climatic influences and fire regimes. Here, we explore biogeographical patterns in the effectiveness of prescribed fire by calculating leverage (the reduction in unplanned area burnt resulting from recent previous area burnt) across south‐eastern Australia over a 25 year period. LOCATION: The 30 bioregions of south‐eastern Australia.

  3. Library Resource
    Articles et Livres
    décembre, 2008
    Australie

    Woody plants have been increasing in many woodland and savanna ecosystems owing to land use changes in recent decades. We examined the effects of encroachment by the indigenous shrub Leptospermum scoparium (Myrtaceae) on herb-rich Eucalyptus camaldulensis woodlands in southern Australia. Species richness and compositional patterns were examined under the canopy of L. scoparium and in surrounding open areas to determine the species most susceptible to structural changes. Richness was significantly lower in areas of moderate to high L.

  4. Library Resource
    Articles et Livres
    décembre, 2008
    Nouvelle-Zélande

    1. A spatially-extensive data set of stream macroinvertebrate communities from 49 northern New Zealand sites sampled over a 10-year period was analysed to assess relationships between the environment (catchment land-cover, landscape position and regional-scale weather patterns), and (i) community persistence and stability based on the constancy of species occurrence (presence-absence) and abundance (per cent composition), respectively and (ii) the temporal variability of various community condition metrics. 2.

  5. Library Resource
    Articles et Livres
    décembre, 2009
    Australie

    This paper examines invasion of grasslands on Cape York Peninsula, Australia, by Melaleuca viridiflora and other woody species, and the role of storm-burning (lighting fires after the first wet season rains) in their maintenance. Trends in disturbance features, fuel characteristics, ground layer composition, and woody plants dynamics under combinations of withholding fire and storm-burning over a 3-year period were measured on 19 plots in three landscape settings. Population dynamics of M.

  6. Library Resource
    Articles et Livres
    décembre, 2014
    Australie

    We can effectively monitor soil condition—and develop sound policies to offset the emissions of greenhouse gases—only with accurate data from which to define baselines. Currently, estimates of soil organic C for countries or continents are either unavailable or largely uncertain because they are derived from sparse data, with large gaps over many areas of the Earth. Here, we derive spatially explicit estimates, and their uncertainty, of the distribution and stock of organic C in the soil of Australia.

  7. Library Resource
    Articles et Livres
    décembre, 2008
    Australie

    To address the hypothesis that there has been a substantial increase in woody vegetation cover ('vegetation thickening') during the 100 years after the burning practices of aboriginal hunter-gatherers were abruptly replaced by the management activities associated with pastoralism in north-east Australia. Three hundred and eighty-three sites on 3000 km transect, inland Queensland, Australia. Vegetation structure descriptions from the route notes of the first European exploration of the location by Ludwig Leichhardt in 1844-45 were georeferenced and compiled.

  8. Library Resource
    Articles et Livres
    décembre, 2009
    Australie, Global

    Global climate change is the major and most urgent global environmental issue. Australia is already experiencing climate change as evidenced by higher temperatures and more frequent and severe droughts. These impacts are compounded by increasing land use pressures on natural resources and native ecosystems. This paper provides a synthesis of the interactions, feedbacks and risks of natural climate variability, climate change and land use/land cover change (LUCC) impacting on the Australian continent and how they vary regionally.

  9. Library Resource
    Articles et Livres
    décembre, 2008
    Australie

    1. A large proportion of the world's land surface is extensively managed for livestock production. In areas where livestock systems are becoming more intensive, a major challenge is to predict those plant species likely to decline, persist or increase as a result of agricultural intensification. 2. Most analyses develop inferences for frequent or abundant species, or rely on intensive studies of single species. A promising approach is to identify plant traits related to disturbance to enable inference to be made about changes in plant community composition.

  10. Library Resource
    Articles et Livres
    décembre, 2011
    Australie, Nouvelle-Zélande

    This paper examines the newly constructed geographically scaled economic output measure, Gross Cell Product (GCP), of Australia and New Zealand to quantify the impacts of climate change in the region. The paper discusses advantages of using the GCP instead of the Gross Domestic Product. The paper reveals that the GCP falls sharply as temperature increases in the region. A 1°C increase in temperature would decrease the productivity with an elasticity of −2.4. A 1 per cent decrease in precipitation would decrease productivity with an elasticity of −2.3.

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