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Showing items 1 through 9 of 504.-
Library ResourceArticles et Livresdécembre, 2011
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Library ResourceArticles et Livresdécembre, 2013Afrique du Sud, Afrique australe, Afrique
The adoption of crop-livestock integration (CLI) among smallholder farmers in the developing countries is no doubt one of the solutions to food security, risk management, and poverty alleviation in sub-Saharan Africa. However, adequate assessment on the current status of CLI becomes necessary for the development and its evolution among smallholder farmers. This article presents a basic and multi-objective linear programming (LP) model to determine enterprise combinations of crop and livestock activities that maximize total gross margin (TGM) among small farms in the Eastern Cape Province.
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Library ResourceArticles et Livresdécembre, 2014États-Unis d'Amérique
The status of grazinglands in the USA is increasingly dynamic with large areas being converted to cropland in response to demands for increased crop production. Here we focus on two types of grazinglands: rangelands and pasturelands. Rangelands are usually defined as natural ecosystems in which the native vegetation is predominantly grasses, grass-like plants or shrubs, and are generally used for grazing livestock and wildlife. Pasturelands are areas specifically managed for the production of forage (native or introduced) for grazing livestock.
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Library ResourceArticles et Livresdécembre, 2008Namibie
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Library ResourceArticles et Livresdécembre, 2014
Tree and shrub abundance has increased in many grasslands, causing changes in ecosystem carbon and nitrogen pools that are related to patterns of woody plant distribution. However, with regard to spatial patterns, little is known about (i) how they develop; (ii) how they are influenced by grazing; or (iii) the extent to which intraspecific interactions dictate them. We addressed these questions by quantifying changes in the spatial distribution of Prosopis velutina (mesquite) shrubs over 74 years on grazed and protected grasslands.
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Library ResourceArticles et Livresdécembre, 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.
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Library ResourceArticles et Livresdécembre, 2013
Communities in Tigray, Northern Ethiopia, have established exclosures on formerly degraded grazing lands and other land uses to promote natural regeneration of plants. Village bylaws devised by communities govern the management of exclosures. We analysed the effectiveness of village bylaws that are used to manage exclosures in addressing forest degradation, resolving conflicts among users over natural resource use, and meeting high expectations of users to realise economic benefits from exclosures through enhancing revenue from sale of grass and dry wood.
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Library ResourceArticles et Livresdécembre, 2015Éthiopie
In Ethiopia, exclosures in landscapes have become increasingly important to improving ecosystem services and reversing biodiversity losses. The present study was conducted in Gomit watershed, northern Ethiopia, to: (i) investigate the changes in vegetation composition, diversity and aboveground biomass and carbon following the establishment of exclosures; and (ii) analyse the economic returns of aboveground carbon sequestration and assess the perception of local communities on land degradation and exclosures.
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Library ResourceArticles et Livresdécembre, 2009Chine
Artemisia ordosica Krasch. is a semishrub native to the Ordos Plateau of Inner Mongolia, northern China, and forms a unique and dominant vegetation type in the sandland of the region. To determine the variation of productivity in A. ordosica rangeland, we investigated net primary production (NPP), fine root turnover, soil microbial C (Cmic), and soil organic carbon density (SOCd) on sand dunes differing in mobility (i.e., fixed, semifixed, and shifting sand dunes) in Mu Us sandland.
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Library ResourceArticles et Livresdécembre, 2013États-Unis d'Amérique
Woody encroachment affects the biohydrology of rangelands worldwide and can increase evapotranspiration by increasing plant rooting depth, increasing the duration of the growing season, or by initiating a process of hydrologic recovery in formerly overgrazed landscapes. Eastern redcedar (Juniperus virginiana) is encroaching rapidly into rangelands in the Southern Great Plains of the USA, and beyond, including Oklahoma. However, the degree to which increasing growing season duration causes higher evapotranspiration after encroachment is not known.
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