Passar para o conteúdo principal

page search

Displaying 9061 - 9072 of 17904

Experience in testing and adapting the LADA methodology for land degradation assessment and mapping in arid regions at the local level

Journal Articles & Books
Dezembro, 2014
Rússia

The LADA methodology (land degradation assessment in drylands) is first used to assess land degradation at the local level for test sites in Russia. The results of the tested methodology are in general positive and, at the same time, indicate the need to adapt it for the assessment of erosion processes, the detailing of mapping categories, and the use of the soil alkalinity indicator. The corresponding recommendations are suggested.

Data at our fingertips, myths in our minds: recent grain price jumps as the ‘perfect storm’

Journal Articles & Books
Dezembro, 2014
Índia
China

The onset of the grain price spikes in late 2007 heralded a heated discussion among economists and policy makers on the source of the problem and appropriate policy responses. The subsequent rounds of price surges hit landless poor consumers hard, and transferred billions of dollars from them to landowners worldwide. Economists offered a list of highly plausible explanations for the recent jumps in grain price levels.

Almost 50� years of monitoring shows that climate, not forestry, controls long‐term organic carbon fluxes in a large boreal watershed

Journal Articles & Books
Dezembro, 2014
Finlândia

Here, we use a unique long‐term data set on total organic carbon (TOC) fluxes, its climatic drivers and effects of land management from a large boreal watershed in northern Finland. TOC and runoff have been monitored at several sites in the Simojoki watershed (3160� km²) since the early 1960s. Annual TOC fluxes have increased significantly together with increased inter‐annual variability. Acid deposition in the area has been low and has not significantly influenced losses of TOC.

Using� spectral analysis� of� Landsat-5� TM� images to map� coastal� wetlands� in the Amazon River mouth, Brazil

Journal Articles & Books
Dezembro, 2014
Brasil

Tropical coastal wetlands form complex and dynamic ecosystems based on a mixture of vegetation, soil, and water components. Optical remotely sensed data have often been used to characterize and monitor these ecosystems, which are among the environments most threatened by climate change and anthropogenic activity worldwide.

role of tree domestication in green market product value chain development

Journal Articles & Books
Dezembro, 2014
África

Internationally, there is interest in increasing the trade in ‘green’ market products, such as organic, fair trade, reduction of deforestation and forest degradation/reduction of deforestation and forest degradation+ for reduced deforestation and mitigation of climate change, and environmental goods and services. This crucially needs to be extended to the many poor, hungry and marginalized smallholder farmers in developing countries.

HERBIVORE‐DRIVEN LAND DEGRADATION: CONSEQUENCES FOR PLANT DIVERSITY AND SOIL IN ARID SUBTROPICAL THICKET IN SOUTH‐EASTERN AFRICA

Journal Articles & Books
Dezembro, 2014
África

Investigations were made of plant and soil responses to severe degradation through heavy grazing and browsing in arid, succulent, subtropical thicket. Severe degradation of thicket is of major concern in terms of threatened biodiversity, unsustainable utilization and collapse of other ecosystem services. We used a natural, field contrast, case‐study approach, sampling within plots under lightly and heavily stocked conditions.

Spatio-Temporal Change in Crowned (Propithecus coronatus) and Decken's Sifaka (Propithecus deckenii) Habitat in the Mahavavy-Kinkony Wetland Complex, Madagascar

Journal Articles & Books
Dezembro, 2014
Madagáscar

The crowned sifaka (Propithecus coronatus) and Decken's sifaka (Propithecus deckenii) are Endangered lemurs endemic to west and central Madagascar. Both have suffered habitat loss and fragmentation throughout their ranges. The goal of this study, conducted in the Mahavavy-Kinkony Wetland Complex (MKWC) in northwestern Madagascar, was to assess the effects of historical change in the species' habitats, and to model the potential impact of further land-use change on their habitats.

DECADAL MODELLING OF RAINFALL EROSIVITY IN BELGIUM

Journal Articles & Books
Dezembro, 2014
Alemanha
Bélgica
Europa

Hydrological extremes are major weather related disasters, but little is known about their long‐term patterns in the context of environmental change. Better understanding of damaging rainfall (e.g. rainfall‐erosivity events) occurring at different time‐scales has important implications for hydrological and land degradation management. The study of the interdecadal variations may help in understanding some of the consequences of abrupt environmental changes over long time periods.

SOIL EROSION IN THREE GRAZED PLANT COMMUNITIES IN NORTHEASTERN PATAGONIA

Journal Articles & Books
Dezembro, 2014

Grazing has been identified as the main cause of land degradation in Patagonia. However, land degradation is highly variable among areas, even within the same paddock. This strongly suggests that different plant communities differ in their resistance to land degradation. In this study, we have evaluated soil erosion at both microsite and community scales in coexisting plant communities subject to sheep grazing in northeastern Patagonia. Three plant communities coexist in the area: two shrub steppes dominated by Chuquiraga avellanedae Lorentz and Nassauvia ulicina (Hook.

Spatio-temporal variation of rhizosphere soil microbial abundance and enzyme activities under different vegetation types in the coastal zone, Shandong, China

Journal Articles & Books
Dezembro, 2014
China

In coastal sandy soils, the establishment of a plant cover is fundamental to avoid degradation and desertification processes. A better understanding of the ability of plants to promote soil microbial process in these conditions is necessary for successful soil reclamation. The current study was to investigate the ability of four different plant species to regenerate the microbiological processes in the rhizosphere soil and to discuss which species were the most effective for the reclamation of the coastal zone.

Irrigation Access and Vulnerability to Climate‐Induced Hydrological Change in the Ecuadorian Andes

Journal Articles & Books
Dezembro, 2014

Climate change is projected to substantially alter the hydrological cycles of mountainous regions, with pronounced consequences for the human settlements in these areas. Because projections of climatic changes and their environmental and societal impacts in local settings are uncertain, policies to reduce vulnerability and strengthen adaptation should be informed by ongoing processes in sites already exposed to climatic variability and change.

Assessment of rates of deforestation classes in the Paraguayan Chaco (Great South American Chaco) with comments on the vulnerability of forests fragments to climate change

Journal Articles & Books
Dezembro, 2014
Paraguai

A large portion of the Occidental Region of Paraguay consists of a semi-arid territory with vegetation adapted to the features of this region. For just over a decade, a process of intense deforestation has resulted from the expansion of mechanized farming, carried out without any form of land management or planning; this has led to the fragmentation of the forests in this region.