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Displaying 493 - 504 of 1169

Antibiotic resistance profiles of soil bacterial communities over a land degradation gradient

Journal Articles & Books
Diciembre, 2009
Tailandia

This study profiled soils over a land degradation gradient to obtain formulae as integrative measures for describing the gradient as a result of deforestation in Thailand. We applied antibiotic resistance most-probable-number profiling to the soil bacterial communities, and then described the gradient. Soil samples were collected on the gradient represented by dry evergreen forest (the original vegetation), dry deciduous forest (moderately disturbed) and bare ground (the most degraded) in February (dry season), March (shortly after temporal precipitation) and June (rainy season) 2001.

Soil carbon dynamics following land‐use change varied with temperature and precipitation gradients: evidence from stable isotopes

Journal Articles & Books
Diciembre, 2015
China

Knowledge of soil organic matter (SOM) dynamics following deforestation or reforestation is essential for evaluating carbon (C) budgets and cycle at regional or global scales. Worldwide land‐use changes involving conversion of vegetation with different photosynthetic pathways (e.g. C₃ and C₄) offer a unique opportunity to quantify SOM decomposition rate and its response to climatic conditions using stable isotope techniques.

Agricultural adjustment, population dynamics and forests redistribution in a subtropical watershed of NW Argentina

Journal Articles & Books
Diciembre, 2014
Argentina

Patterns of land-use and land-cover change are usually grouped into one of two categories defined by the dominant trend: (1) deforestation resulting from expanding agriculture and (2) forest expansion, usually related to the abandonment of marginal lands. At regional scale, however, both processes can occur simultaneously even in the absence of net change. Given the focus on net change, such redistribution of agricultural and natural and seminatural lands has been generally overlooked.

Fuelwood, deforestation, and land degradation: 10 years of evidence from cebu province, the Philippines

Journal Articles & Books
Diciembre, 2008
Filipinas
África
América central
Asia
América del Sur

A major development concern of the 1970s and 1980s was 'the other energy' or 'woodfuel crisis'. Woodfuel use in developing regions of Africa, Asia, and Latin America was believed to be a key factor in tropical deforestation, and the loss of forests was projected to result in widespread woodfuel shortages. In recent years, however, it has become apparent that woodfuel production is seldom a direct cause of deforestation (although it may be a by-product), and that most woodfuel demand is met by trees and shrubs growing outside of forest areas.

Vegetation change and land tenure in Mexico: A country-wide analysis

Journal Articles & Books
Diciembre, 2013
México

There is an ongoing debate on the effect different property regimes have on the use of natural resources and land conversion (i.e., deforestation or reforestation). Much of the discussion has been centered on the two main forms of tenure regime: common-pool system and private property. Case studies around the world have provided evidence on whether one is more effective at preventing deforestation than the other, but there is not a clear pattern. Part of the problem is that evidence comes from theoretical models or isolated case studies instead of comparative studies across large areas.

Analysis of factors influencing farmers' voluntary participation in reforestation programme in Ghana

Journal Articles & Books
Diciembre, 2015
Ghana

Policy-makers consider participatory reforestation and forest resource management to be the key to reducing the problems of deforestation and forest degradation. In this regard, the government of Ghana introduced a modified taungya system as a mechanism to restore degraded forest reserves under the National Forest Plantation Development Programme to allow landless farmers access to land for temporary crop production and secured tree tenure rights.

Cattle Accumulation and Land Use Intensification by Households in the Brazilian Amazon

Journal Articles & Books
Octubre, 2005
Brasil
América central
América del Sur

In developing countries across the globe the impact of livestock on deforestation levels has
been profound. This paper explores the role of the cattle industry in household decision
making for small landholders in the Brazilian Amazon. Important inquiries raised in the
literature are addressed, including the determinants of the co-evolution of deforestation and cattle herds, the possibility of production specialization, and the role of cattle in household livelihoods. Panel data suggest that households have changed focus from crop

Deforestation and fragmentation of natural forests in the upper Changhua watershed, Hainan, China: implications for biodiversity conservation

Journal Articles & Books
Diciembre, 2015
China

Hainan, the largest tropical island in China, belongs to the Indo-Burma biodiversity hotspot. The Changhua watershed is a center of endemism for plants and birds and the cradle of Hainan’s main rivers. However, this area has experienced recent and ongoing deforestation and habitat fragmentation. To quantify habitat loss and fragmentation of natural forests, as well as the land-cover changes in the Changhua watershed, we analyzed Landsat images obtained in 1988, 1995, and 2005.

Farmers' (local and colonists) perceptions of environmental changes in the forest frontier of the upper Amazon, Peru

Journal Articles & Books
Diciembre, 2014
Perú

Amazon ecosystem degradation profoundly impacts life supporting processes of global importance such as climate regulation, as well as local conditions for livelihoods. In Peru's highland jungle, an expanding deforestation front of forest conversion to agriculture has vastly transformed the landscape. Small–scale farming, the main driver of forest degradation, and consequently household natural resource management affect ecosystem functionality. To investigate farmers' attitudes and priorities to services provided by the ecosystems (ES) we interviewed 51 farmers, both local and colonists.

Deforestation dynamics in Mato Grosso in the southern Brazilian Amazon using GIS and NOAA/AVHRR data

Journal Articles & Books
Diciembre, 2011

Mato Grosso has emerged as the Brazilian state with the highest deforestation rate, and with the most dynamic changes in vegetation and land cover. In this article, we focus on the following two main objectives: (i) to quantitatively assess the extent of vegetation change over the past two decades for more accurate eco-climatic impact analysis; and (ii) to clarify the causes to the changes in this state, with special focus to agro-pastoral activities and roads networks.

Exploring land use changes and the role of palm oil production in Indonesia and Malaysia

Journal Articles & Books
Diciembre, 2011
Indonesia
Malasia

This study compiles and analyses national-level data on land use change (LUC) and its causes in Indonesia and Malaysia over the past 30 years. The study also explores the role that palm oil has played in past LUC and that projected growth in palm oil production may play in LUC until 2020 and suggests strategies to minimize negative effects. Data collection for the study revealed that the quality and quantity of data on LUC on a national scale over time are low.

Fragmentation in the Legal Amazon, Brazil: Can landscape metrics indicate agricultural policy differences?

Journal Articles & Books
Diciembre, 2011
Brasil

Large-scale land conversion for agriculture in Brazilian Amazonia is occurring at persistently high rates. Basin-wide net land use and land cover changes imply substantially different situations between distinct regions and states due to different agricultural policies. This research used eight landscape metrics to quantify and investigate the spatial patterns of cattle pasture and cropland throughout the states of Pará, Mato Grosso, Rondônia, and Amazonas.