Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 39.
  1. Library Resource
    Articles et Livres
    août, 2018
    Afrique australe, Afrique

    Empirical scientific evidence indicates that there is still room for increasing food production by improving land productivity. This study aimed at identifying the key determinants that govern farmers’ decisions to adopt multiple components of integrated soil fertility management (ISFM) in a maize mixed cropping system of the Chinyanja Triangle, Southern Africa.

  2. Library Resource
    Articles et Livres
    décembre, 2007
    République-Unie de Tanzanie

    Livestock encroachment is threatening the populations of large wild mammals in Tanzania. Competition for quality grazing land by domestic stocks is one of the main factors impacting wild species during this encroachment. In the Kilombero Game Controlled Area (KGCA), extensive livestock husbandry is negatively associated with wildlife populations, especially outside the hunting season. This study assessed the relationship between livestock number and the abundance of three wild species: puku, buffalo and elephant.

  3. Library Resource
    Articles et Livres
    décembre, 2011
    Madagascar, Kenya, Afrique

    Protected Areas (PAs) form a core component of efforts to conserve biodiversity, but are designated for a variety of reasons. We assessed the effectiveness of PAs in covering the ranges of 157 globally threatened terrestrial bird species in mainland Africa and Madagascar. To reduce commission errors, rather than using Extent of Occurrence (EOO) as a measure of distribution, we estimated the Extent of potentially Suitable Habitat (ESH) for each species within its EOO, using data on habitat preferences and land cover.

  4. Library Resource
    Articles et Livres
    décembre, 2009
    République-Unie de Tanzanie

    To highlight and examine apparent paradoxes in assessing the effectiveness of different forms of land-use for biodiversity conservation. Tanzania. We compare and contrast the findings of two recent and seemingly conflicting studies on the effectiveness of conservation protection strategies in Tanzania. We evaluate these studies in the context of a wider body of evidence relating to the problem of determining protected area performance.

  5. Library Resource
    Articles et Livres
    décembre, 2009
    Ouganda

    The paper is based on an on-going 3-year study in the wetland communities of Kampala. The study uses participatory methods and aims to contribute to (i) the development of low-income wetland communities, (ii) to prepare these communities to become less dependent on wetlands without receding into poverty, and (iii) the better management of the wetlands. The communities in direct dependence and intimate interaction with Nakivubo wetlands are mainly poor, live and work under hazardous conditions, and their activities pose a threat to the ecological function of the wetlands.

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

    AIM: We map estimated historical population declines resulting from species‐specific models of sensitivity to habitat fragmentation for three forest‐dependent chameleons. LOCATION: East Usambara Mountains, Eastern Arc Mountains, Tanzania. METHODS: We surveyed three chameleon species (Rhampholeon spinosus, Rhampholeon temporalis and Trioceros deremensis) along 32.2� km of transects and used a hierarchical, distance‐sampling model to estimate densities. The model included habitat characteristics at the landscape (patch) and local (transect) scales while accounting for detectability.

  7. Library Resource
    Articles et Livres
    décembre, 2009
    Afrique du Sud, Afrique australe, Afrique

    Evidence is accumulating of a general increase in woody cover of many savanna regions of the world. Little is known about the consequences of this widespread and fundamental ecosystem structural shift on biodiversity. South Africa. We assessed the potential response of bird species to shrub encroachment in a South African savanna by censusing bird species in five habitats along a gradient of increasing shrub cover, from grassland/open woodland to shrubland dominated by various shrub species.

  8. Library Resource
    Articles et Livres
    décembre, 2009
    République-Unie de Tanzanie

    While the decrease in flow is obvious in the Kikuletwa River, the mechanism leading to the decrease is unclear. We assessed the influence of vegetation cover change on dry season flow in the Kikuletwa River. The combined cover of closed and open forests decreased by 68% while closed and open forests decreased by 56% and 64% respectively. Land under agroforestry decreased by 25%, while that under annual crops increased by 41%. Grasslands increased by 116% and riverine vegetation decreased by 53%.

  9. Library Resource
    Articles et Livres
    décembre, 2009
    Afrique du Sud, Afrique australe

    This study determined the effects of land-use practice had on the rate and extent of bush encroachment in a mesic savanna in KwaZulu-Natal, South Africa. Changes in woody cover were measured for 1 km² sites in areas under communal, commercial and conservation land-use systems for the period between 1937 and 2000. Land users from each area were interviewed to gain the histories of each area and to determine how the changes in woody cover had impacted them and whether anything was being done to counteract the spread of trees and shrubs on their land.

  10. Library Resource
    Articles et Livres
    décembre, 2007
    Afrique du Sud, Afrique australe

    This article analyzes debates over tenure reform policy in post-apartheid South Africa, with a particular focus on the controversial Communal Land Rights Act of 2004. Land tenure systems in the 'communal areas' of South Africa are described as dynamic and evolving regimes within which a number of important commonalities and continuities over time are observable.

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