نتایج جستجو برای: deforestation

تعداد نتایج: 5221  

Journal: :Philosophical transactions of the Royal Society of London. Series B, Biological sciences 2015
Alexander Pfaff Juan Robalino Catalina Sandoval Diego Herrera

The leading policy to conserve forest is protected areas (PAs). Yet, PAs are not a single tool: land users and uses vary by PA type; and public PA strategies vary in the extent of each type and in the determinants of impact for each type, i.e. siting and internal deforestation. Further, across regions and time, strategies respond to pressures (deforestation and political). We estimate deforesta...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
N Devaraju Govindasamy Bala Angshuman Modak

In this paper, using idealized climate model simulations, we investigate the biogeophysical effects of large-scale deforestation on monsoon regions. We find that the remote forcing from large-scale deforestation in the northern middle and high latitudes shifts the Intertropical Convergence Zone southward. This results in a significant decrease in precipitation in the Northern Hemisphere monsoon...

2013
Thomas K. Rudel

For decades, the dynamics of tropical deforestation in sub-Saharan Africa (SSA) have defied easy explanation. The rates of deforestation have been lower than elsewhere in the tropics, and the driving forces evident in other places, government new land settlement schemes and industrialized agriculture, have largely been absent in SSA. The context and causes for African deforestation become clear...

Journal: :Global change biology 2014
Thomas W Crowther Daniel S Maynard Jonathan W Leff Emily E Oldfield Rebecca L McCulley Noah Fierer Mark A Bradford

The consequences of deforestation for aboveground biodiversity have been a scientific and political concern for decades. In contrast, despite being a dominant component of biodiversity that is essential to the functioning of ecosystems, the responses of belowground biodiversity to forest removal have received less attention. Single-site studies suggest that soil microbes can be highly responsiv...

ژورنال: علوم آب و خاک 2009
اسماعیلی, عبدالکریم, نصرنیا, فاطمه,

Deforestation has been recognized as one of the biggest environmental problems in the world. It is also one of the main elements of land productivity changes and one of the biggest factors which threaten world's environmental diversity. In this study, based on environmental Kuznets theory, factors which may affect deforestation have been investigated. Results obtained from 71 studied countries ...

اسماعیلی, عبدالکریم, نصرنیا, فاطمه,

Deforestation has been recognized as one of the biggest environmental problems in the world. It is also one of the main elements of land productivity changes and one of the biggest factors which threaten world's environmental diversity. In this study, based on environmental Kuznets theory, factors which may affect deforestation have been investigated. Results obtained from 71 studied countries ...

Journal: :Environmental Modelling and Software 2004
Jean-François Mas Henri Puig José Luis Palacio Atahualpa Sosa-López

This study aims to predict the spatial distribution of tropical deforestation. Landsat images dated 1974, 1986 and 1991 were classified in order to generate digital deforestation maps which locate deforestation and forest persistence areas. The deforestation maps were overlaid with various spatial variables such as the proximity to roads and to settlements, forest fragmentation, elevation, slop...

2014
Shanyou Zhu Hailong Zhang Ronggao Liu Yun Cao Guixin Zhang

Sampling designs are commonly used to estimate deforestation over large areas, but comparisons between different sampling strategies are required. Using PRODES deforestation data as a reference, deforestation in the state of Mato Grosso in Brazil from 2005 to 2006 is evaluated using Landsat imagery and a nearly synchronous MODIS dataset. The MODIS-derived deforestation is used to assist in samp...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2017
Andrea A Azevedo Raoni Rajão Marcelo A Costa Marcelo C C Stabile Marcia N Macedo Tiago N P Dos Reis Ane Alencar Britaldo S Soares-Filho Rayane Pacheco

The 2012 Brazilian Forest Code governs the fate of forests and savannas on Brazil's 394 Mha of privately owned lands. The government claims that a new national land registry (SICAR), introduced under the revised law, could end illegal deforestation by greatly reducing the cost of monitoring, enforcement, and compliance. This study evaluates that potential, using data from state-level land regis...

2016
Kelley Lee Natalia Carrillo Botero Thomas Novotny

BACKGROUND Deforestation due to tobacco farming began to raise concerns in the mid 1970s. Over the next 40 years, tobacco growing increased significantly and shifted markedly to low- and middle-income countries. The percentage of deforestation caused by tobacco farming reached 4 % globally by the early 2000s, although substantially higher in countries such as China (18 %), Zimbabwe (20 %), Mala...

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