Résultats de la recherche | Land Portal

Résultats de la recherche

Showing items 1 through 9 of 161.
  1. Library Resource
    Articles et Livres
    décembre, 2014

    The first few years of tropical forest restoration can be expensive, especially when applied to expansive areas. In light of this, passive restoration has been recommended as a considerably cheaper or even free alternative. There are, however, both direct and indirect costs associated with passive restoration. First, the longer recovery time that is typically required in passive restoration can be perceived as project failure, especially when compared with nearby active restoration efforts.

  2. Library Resource
    Articles et Livres
    décembre, 2014
    États-Unis d'Amérique

    BACKGROUND: Recent evidence indicates that some populations of European corn borer (ECB), Ostrinia nubilalis (Hübner), have declined to historic lows owing to widespread adoption of Bt corn hybrids. To understand current ECB populations in Pennsylvania field corn, the authors assessed larval damage in Bt and non‐Bt corn hybrids at 29 sites over 3 years. The influence of Bt adoption rates, land cover types and moth activity on levels of ECB damage was also considered.

  3. Library Resource
    Articles et Livres
    décembre, 2016
    Italie

    Italy has always had a long dramatic history of extreme events such as landslides, flooding, land degradation and drought. Much has been done in terms of prevention and monitoring but still there is much left to do, in particular introducing innovative alert systems based on the integration of real‐time weather forecasting with national alert and protection systems.

  4. 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.

  5. Library Resource
    Articles et Livres
    décembre, 2011
    Éthiopie

    A study was conducted in the Ambo district of western Ethiopia in 2006 to understand the poverty reduction impacts of small-scale irrigation development, using the Indris irrigation system as a case study. The study was based on a survey of representative farm households with and without access to irrigation. The total sample size for the study was 222 (107 households with access to irrigation and 115 without). Data were analysed using descriptive statistics, the Foster, Greer and Thobeck poverty indices, and Heckman's selectivity model.

  6. Library Resource
    Articles et Livres
    décembre, 2014
    Canada

    The hydrology of boreal regions is strongly influenced by seasonal snow accumulation and melt. In this study, we compare simulations of snow water equivalent (SWE) and streamflow by using the hydrological model HYDROTEL with two contrasting approaches for snow modelling: a mixed degree‐day/energy balance model (small number of inputs, but several calibration parameters needed) and the thermodynamic model CROCUS (large number of inputs, but no calibration parameter needed).

  7. Library Resource
    Articles et Livres
    décembre, 2014
    Éthiopie

    The objective of this study was to quantify the impacts of land use/land cover (LULC) change on the hydrology of the Jedeb, an agricultural dominated mesoscale catchment, in the Abay/Upper Blue Nile basin, Ethiopia. Two methods have been used. First, the trends of certain daily flow variability parameters were evaluated to detect statistical significance of the change of the hydrologic response. Second, a conceptual monthly hydrological model was used to detect changes in the model parameters over different periods to infer LULC change.

  8. Library Resource
    Articles et Livres
    décembre, 2016
    États-Unis d'Amérique

    One challenge in the effort to conserve biodiversity is identifying where to prioritize resources for active land management. Cost–benefit analyses have been used successfully as a conservation tool to identify sites that provide the greatest conservation benefit per unit cost. Our goal was to apply cost–benefit analysis to the question of how to prioritize land management efforts, in our case the application of prescribed fire to natural landscapes in Wisconsin, USA.

  9. Library Resource
    Articles et Livres
    décembre, 2015
    Chine

    Irrigation in northern China is exposed to declining groundwater resources and institutional issues. As a response, authorities have developed measures that include differentiated resource allocation and charging, collective and individual water rights, a block pricing system, prepaid access to water, and real‐time monitoring of resource and use. This paper analyses this alternative management model and its implications at the farm and system levels, using institutional, technical and economic analyses of case studies from Qingxu County, northern China.

  10. Library Resource
    Articles et Livres
    décembre, 2014
    Canada

    Mining disturbs large forested areas around the world, including boreal forests after oil sands mining in Canada. Industrial companies are expected to reclaim degraded land to ecosystems with equivalent land capability. This research showed the value of woody debris for reclamation of dramatically disturbed landscapes with a forest ecosystem end land use. Adding woody debris during reclamation can facilitate recovery of flora, soil nutrient cycling and water and nutrient holding capacity.

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