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Displaying 3625 - 3636 of 5264

Monitoring of Livestock Grazing Effects on Bureau of Land Management Land

Journal Articles & Books
Décembre, 2014
États-Unis d'Amérique

Public land management agencies, such as the Bureau of Land Management (BLM), are charged with managing rangelands throughout the western United States for multiple uses, such as livestock grazing and conservation of sensitive species and their habitats. Monitoring of condition and trends of these rangelands, particularly with respect to effects of livestock grazing, provides critical information for effective management of these multiuse landscapes.

Plant use and management in homegardens and swiddens: evidence from the Bolivian Amazon

Journal Articles & Books
Décembre, 2010
Bolivie

Amazonian plant management is perhaps nowhere as intense as in homegardens and swiddens. A quantitative ethnobotanical study was conducted in Indigenous Territory and National Park Isiboro-Sécure, Bolivia, to investigate plant use and management in homegardens and swiddens by local Yuracaré and Trinitario ethnic groups. Ethnobotanical data of plants were obtained from 11 Yuracaré and 11 Trinitario participants through semistructured interviews.

Traditional perennial crop-based agroforestry in West Java: the tradeoff between on-farm biodiversity and income

Journal Articles & Books
Décembre, 2010

Agroforestry systems have been re-evaluated with a renewed scientific interest as appropriate models for achieving sustainable production while maintaining planned and associated biodiversity and agroecosystem functioning. Traditional bamboo-tree gardens in West Java are known to play substantial ecological and socioeconomic roles. In this study, we attempted to elucidate the relationship between income generation and biodiversity by studying 83 bamboo-tree gardens that varied in species composition and degree of commercialization.

effect of fireline intensity on woody fuel consumption in southern Australian eucalypt forest fires

Journal Articles & Books
Décembre, 2011
Australie

SummaryThe relationship between woody fuel consumption and fireline intensity was assessed using data collected at controlled fires and wildfires in south-western Western Australia, central Victoria and south-eastern New South Wales. The combined dataset consisted of fires in a range of dry eucalypt forests. Fire behaviour varied from slow, self-extinguishing prescribed burns to intense, fast—moving fires burning under conditions of extreme fire danger. Fireline intensity ranged from 50 kW m⁻ˡ to

Assessing the effects of agricultural management practices on carbon fluxes: Spatial variation and the need for replicated estimates of Net Ecosystem Exchange

Journal Articles & Books
Décembre, 2010

Replicated measurements of Net Ecosystem CO₂ Exchange (NEE) were made on four arable plots using two eddy covariance (EC) towers that were moved at regular intervals. Replicated plots were created by dividing a large arable field into four approximately equal areas (∼2.5ha). Regular adjustments of the EC measurement height (1.5-1.9m) due to seasonal changes in canopy height ensured that the analyzed fluxes were derived from the individual plots. This was sufficient to make high-quality flux measurements with the energy balance accounting for up to 96% of the available energy in the system.

Managing water by managing land: Addressing land degradation to improve water productivity and rural livelihoods

Journal Articles & Books
Décembre, 2010

The premise of this paper is that the key to effective water resources management is understanding that the water cycle and land management are inextricably linked: that every land use decision is a water use decision. Gains in agricultural water productivity, therefore, will only be obtained alongside improvements in land use management. Expected increases in food demands by 2050 insist that agricultural production - and agricultural water use - must increase.

Enjeux fonciers, exploitation des ressources naturelles et Forêts des Communautés Locales en périphérie de Kinshasa, RDC

Journal Articles & Books
Décembre, 2011
République démocratique du Congo

Land issues, exploitation of natural resources, and Forests of Rural Communities in the periphery of Kinshasa, DRC. Peri-urban forests are under strong anthropic pressure. Any activity needs a previous identification of stakeholders, landscape perception, socio-economic trends in local communities and their relationships with land and natural resources. Kinshasa (capital of Democratic Republic of Congo, DRC) is a 10 millions inhabitants city with rapid growth and increasing impacts on surrounding villages linked with forest natural resources.

Detecting changes in biomass productivity in a different land management regimes in drylands using satellite‐derived vegetation index

Journal Articles & Books
Décembre, 2014

We investigated the use of a satellite‐derived vegetation index to detect changes in biomass productivity in different land management regimes in drylands of the Northern Negev. Two well‐documented management regimes, conservation and afforestation using a contour trenching technique were monitored. Biomass data on annual vegetation were collected from field survey and compared to a time series of the Normalized Difference Vegetation Index (NDVI). A significant relationship between NDVI and biomass (r� =� 0.83, P�

Do ecological networks in South African commercial forests benefit grassland birds? A case study of a pine plantation in KwaZulu-Natal

Journal Articles & Books
Décembre, 2010
Afrique du Sud
Afrique australe

Grasslands in South Africa have been extensively transformed and fragmented, but are poorly protected. Commercial afforestation poses a particular threat to grassland biodiversity because areas suitable for forestry coincide with those supporting the greatest richness of endemic and threatened biota. To comply with international forestry standards, commercial timber growers leave “ecological networks” of interconnected open corridors within plantations: however, the value of these networks for conservation is unclear.

Intensification of agriculture, landscape composition and wild bee communities: A large scale study in four European countries

Journal Articles & Books
Décembre, 2010
France
Suisse
Belgique
Pays-Bas

The impacts of agricultural practices and landscape composition on bee communities were investigated in 14 sites located in four Western European countries (Belgium, France, the Netherlands and Switzerland). Standardized interviews with farmers assessed agricultural practices in terms of agricultural inputs (nitrogen fertilization and pesticides), livestock density and crop types. The proportion of semi-natural habitats was calculated for each site. We showed negative effects of agricultural intensification on species richness, abundance and diversity of wild bees.

Forest fragments modulate the provision of multiple ecosystem services

Journal Articles & Books
Décembre, 2014
Canada

Agricultural landscapes provide the essential ecosystem service of food to growing human populations; at the same time, agricultural expansion to increase crop production results in forest fragmentation, degrading many other forest‐dependent ecosystem services. However, surprisingly little is known about the role that forest fragments play in the provision of ecosystem services and how fragmentation affects landscape multifunctionality at scales relevant to land management decisions.