Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 3415.
  1. Library Resource
    Articles et Livres
    décembre, 2011
    Iran

    Proteins comprise one of the largest N inputs to soils. There is, therefore, a need to investigate the factors involved in the inputs and fate of proteins in soil. While land use management is expected to influence the amount and diversity of soil proteins, the responses of protein as a source of mineralizable N to land use changes have not yet been studied. We hypothesized that extractable soil protein could be a sensitive indicator in evaluating the effect of stress in ecosystem.

  2. Library Resource
    Articles et Livres
    décembre, 2000
    France, Irlande, Espagne

    The relationship between vegetation and environment was investigated for calcareous grasslands in a region in the west of Spain, France, Britain and Ireland defined by climatic criteria. Vegetation was sampled using objective methods and data collected on soils, land cover, location and management. Climate data were obtained from an available database. Examination of the first axis of vegetation variation as defined by Detrended Correspondence Analysis (DCA) showed a gradient from the Irish and British samples to those from France.

  3. Library Resource
    Articles et Livres
    décembre, 2015

    In a greenhouse study, the effects of vermicompost and arbuscular mycorrhizal fungi (AM fungi) bio fertilizers on soil properties and Medicago polymorpha growth were studied. The experiment was set up in a completely randomized design in a factorial layout with five replications. The vemicompost treatment was applied in six different levels, including 0, 15, 30, 45, 60 and 75% fertilizer. Further, AM fungi treatment was applied in two levels (inoculating with and without AM fungi).

  4. Library Resource
    Articles et Livres
    décembre, 2014

    The vegetation of semi‐arid and arid landscapes is often comprised of mixtures of herbaceous and woody vegetation. Since the early 1900s, shifts from herbaceous to woody plant dominance, termed woody plant encroachment and widely regarded as a state change, have occurred world‐wide. This shift presents challenges to the conservation of grassland and savanna ecosystems and to animal production in commercial ranching systems and pastoral societies.

  5. Library Resource
    Articles et Livres
    décembre, 2014
    Afrique du Sud, Afrique australe

    We examined the effect of changes in land use and land tenure on bush encroachment and vegetation condition. An analysis of aerial photographs from three time steps (1949, 1985 and 2004) was used to document changes in woody plant density in different vegetation types on commonage and an adjacent commercial farm in Fort Beaufort, South Africa. Rangeland condition was assessed in different vegetation units of the area and woody plant density was related to distance from urban settlement.

  6. Library Resource
    Articles et Livres
    décembre, 2014
    République-Unie de Tanzanie

    Population growth near protected areas threatens the capacity of such areas for biodiversity conservation. Protected areas may even encourage growth by providing economic benefits that attract migrants. Consequently, understanding the relationships between human demographics and biodiversity is important for conservation. We studied a community-governed Wildlife Management Area bordering the Selous Game Reserve in Tanzania, set up to benefit local people and the subsistence rural economy. Annual population growth in this area is 5%.

  7. Library Resource
    Articles et Livres
    décembre, 2016
    Australie

    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
    Articles et Livres
    décembre, 2011

    Western North America is experiencing a dramatic expansion of piñon (Pinus spp.) and juniper (Juniperus spp.) (P-J) trees into shrub-steppe communities. Feature extracted data acquired from remotely sensed imagery can help managers rapidly and accurately assess this land cover change in order to manage rangeland ecosystems at a landscape-scale.

  9. Library Resource
    Articles et Livres
    décembre, 2013
    Inde, Asie

    Nomadic pastoralism has thrived in Asia’s rangelands for several millennia by tracking seasonal changes in forage productivity and coping with a harsh climate. This pastoralist lifestyle, however, has come under intense transformations in recent decades due to socio-political and land use changes. One example is of the high-altitude trans-Himalayan rangelands of the Jammu and Kashmir State in northern India: major socio-political reorganisation over the last five decades has significantly impacted the traditional pasture use pattern and resources.

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