نتایج جستجو برای: human induced deforestation

تعداد نتایج: 2436176  

2013
X P Song J R Townshend

Deforestation often results in massive carbon emissions and loss of ecosystem services. The objective of this paper is to develop an integrated approach to quantitatively derive changes in forest carbon stock and changes in the economic value of forest carbon due to deforestation. Combining the best available remote sensing and socioeconomic datasets, this approach establishes a comprehensive b...

2013
ALEXANDER PFAFF LUIS DIEGO HERRERA

— For Acre, in the Brazilian Amazon, we find that protection types with differences in governance, including different constraints on local economic development, also differ in their locations. Taking this into account, we estimate the deforestation impacts of these protection types that feature different levels of restrictions. To avoid bias, we compare these protected locations with unprotect...

Journal: :Journal of land use science 2015
Oh Seok Kim Joshua P Newell

This paper proposes a new land-change model, the Geographic Emission Benchmark (GEB), as an approach to quantify land-cover changes associated with deforestation and forest degradation. The GEB is designed to determine 'baseline' activity data for reference levels. Unlike other models that forecast business-as-usual future deforestation, the GEB internally (1) characterizes 'forest' and 'defore...

2017
Thomas K. Rudel

Forests in the dry tropics differ significantly from forests in the humid tropics in their biomass and in their socio-ecological contexts, so it might be reasonable to assume that the dynamics that drive deforestation in these two settings would also differ. Until recently, difficulties in measuring the extent of dry tropical forests have made it difficult to investigate this claim empirically....

2016
Paulo Queiroz Sousa Andrew P. Vayda Eric J. Jokela

Forest conservation efforts through regulatory enforcement routinely failed to prevent large scale deforestation in the Brazilian Amazon. However, a turning point occurred in 2005, when a combination of unfavorable economic conditions and an unprecedented coordinated effort between governmental institutions resulted in a gradual slowdown in deforestation. The continuation of this deforestation ...

2004
Juan A. Robalino Alexander Pfaff

We estimate the effects of neighbors’ deforestation actions on individuals’ deforestation decisions in Costa Rica. We find evidence that neighbors’ effects are positive and significant. To address simultaneity and spatially correlated unobservable factors, we instrument for neighboring deforestation using neighboring land parcel characteristics. Under the presence of interactions, local forest ...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2014
Javier Godar Toby A Gardner E Jorge Tizado Pablo Pacheco

Annual deforestation rates in the Brazilian Amazon fell by 77% between 2004 and 2011, yet have stabilized since 2009 at 5,000-7,000 km(2). We provide the first submunicipality assessment, to our knowledge, of actor-specific contributions to the deforestation slowdown by linking agricultural census and remote-sensing data on deforestation and forest degradation. Almost half (36,158 km(2)) of the...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2006
Douglas C Morton Ruth S DeFries Yosio E Shimabukuro Liana O Anderson Egidio Arai Fernando del Bon Espirito-Santo Ramon Freitas Jeff Morisette

Intensive mechanized agriculture in the Brazilian Amazon grew by >3.6 million hectares (ha) during 2001-2004. Whether this cropland expansion resulted from intensified use of land previously cleared for cattle ranching or new deforestation has not been quantified and has major implications for future deforestation dynamics, carbon fluxes, forest fragmentation, and other ecosystem services. We c...

Journal: :Science 1993
D Skole C Tucker

Landsat satellite imagery covering the entire forested portion of the Brazilian Amazon Basin was used to measure, for 1978 and 1988, deforestation, fragmented forest, defined as areas less than 100 square kilometers surrounded by deforestation, and edge effects of 1 kilometer into forest from adjacent areas of deforestation. Tropical deforestation increased from 78,000 square kilometers in 1978...

2011
Jorge Alberto Achcar Edson Zangiacomi Martinez Vilma Mayumi Tachibana Edilson Ferreira Flores

Introduction: Malaria is a serious problem in the Brazilian Amazon region, and the detection of possible risk factors could be of great interest for public health authorities. The objective of this article was to investigate the association between environmental variables and the yearly registers of malaria in the Amazon region using Bayesian spatiotemporal methods. Methods: We used Poisson spa...

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