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Mostrando ítems 1 a 9 de 160.
  1. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014
    Papua Nueva Guinea

    An unprecedented increase in oil palm developments may be underway in Papua New Guinea (PNG) through controversial “special agricultural and business leases” (SABLs) covering over two million hectares. Oil palm development can create societal benefits, but doubt has been raised about whether the SABL developers intend establishing plantations. Here, we examine the development objectives of these proposals through an assessment of their land suitability, developer experience and capacity, and sociolegal constraints.

  2. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014
    Camerún, África, África Central

    Africa is on the verge of a mining boom. We review the environmental threats from African mining development, including habitat alteration, infrastructure expansion, human migration, bushmeat hunting, corruption, and weak governance. We illustrate these threats in Central Africa, which contains the vast Congo rainforest, and show that more than a quarter of 4,151 recorded mineral occurrences are concentrated in three regions of biological endemism—the Cameroon‐Gabon Lowlands, Eastern DRC Lowlands, and Albertine Rift Mountains—and that most of these sites are currently unprotected.

  3. Library Resource
    Artículos de revistas y libros
    Diciembre, 2011

    Although sustainable land management (SLM) is widely promoted to prevent and mitigate land degradation and desertification, its monitoring and assessment (M&A) has received much less attention. This paper compiles methodological approaches which to date have been little reported in the literature. It draws lessons from these experiences and identifies common elements and future pathways as a basis for a global approach. The paper starts with local level methods where the World Overview of Conservation Approaches and Technologies (WOCAT) framework catalogues SLM case studies.

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

    The limited amount of studies addressing the long‐term effectiveness of restoration actions to combat land degradation is a constraint for current landscape restoration planning and implementation. Remote sensing data provide a unique opportunity for gathering information on the spatial and temporal variability of restoration processes and may contribute to fill this knowledge gap.

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

    The role of land registration in reducing rural poverty has been debated for several decades. This article analyses the impacts of land registration on land rentals, security of land tenure, disputes over land, use of credit facilities from formal financial institutions and gender access and control over land. Our findings are based on data collected between April and December 2011 in irrigation systems in three regional states of Ethiopia using in‐depth interviews and field surveys.

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

    The flow–sediment relationship is important to understand the soil erosion and land degradation processes in severe eroded areas. This study researches on variations of streamflow, sediment load, and flow–sediment relationship on multi‐temporal scales (annual, flood season and, monthly scales) in a highly erodible catchment of Chinese Loess Plateau.

  7. Library Resource
    Artículos de revistas y libros
    Diciembre, 2012
    Argelia

    The use of groundwater in irrigated agriculture is often regarded as an effective way of increasing farm productivity. However, the effects of differential access to groundwater by farmers have rarely been studied at the microeconomic scale, particularly the possibly negative effects of marginalization of small farmers. During the hydraulic crisis that has affected Algerian irrigation schemes since the 1980s, groundwater has become a major source of irrigation for farmers. A process of farm differentiation occurred linked to farmers' access to groundwater, causing social inequity.

  8. Library Resource
    Artículos de revistas y libros
    Diciembre, 2010
    Irán

    The main objective of this research was to compare the suitability of land for surface and drip irrigation methods according to a parametric evaluation system in the plains west of the city of Shush, in south‐west Iran. After analysing and evaluating soil properties, suitability maps were generated for both methods by means of remote sensing (RS) and a geographic information system (GIS). The results showed that 9031 ha (21.5%) of the studied area was highly suitable for surface irrigation methods, whereas 32 500 ha (77.5%) of the study area was highly suitable for drip irrigation methods.

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

    BACKGROUND: Soil organic carbon (SOC) is fundamental for mitigating climate change as well as improving soil fertility. Databases of SOC obtained from soil surveys in 1981 and 2011 were used to assess SOC change (0–20 cm) in croplands of Heilongjiang Province in northeast China. Three counties (Lindian, Hailun and Baoqing) were selected as typical croplands representing major soil types and land use types in the region. RESULTS: The changes in SOC density (SOCD) between 1981 and 2001 were −6.6, −14.7 and 5.7 Mg C ha⁻¹ in Lindian, Hailun and Baoqing Counties respectively.

  10. Library Resource
    Artículos de revistas y libros
    Diciembre, 2014
    China

    Comprehensive evaluation of farmland infrastructure plays a significant role in utilizing water resources fully and ensuring a high and stable yield of crops. This study was conducted in the Shiyang River Basin, the arid region of north‐west China. The evaluation hierarchy of farmland infrastructure, including objective, criterion, sub‐criterion and attribute levels, was established. The weights of evaluation indices at different levels of the evaluation system were calculated using the analytic hierarchy process.

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