Sabiia Seb
PortuguêsEspañolEnglish
Embrapa
        Busca avançada

Botão Atualizar


Botão Atualizar

Ordenar por: RelevânciaAutorTítuloAnoImprime registros no formato resumido
Registros recuperados: 25
Primeira ... 12 ... Última
Imagem não selecionada

Imprime registro no formato completo
A Spatial-Intertemporal Model for Tropical Forest Management Applied to Khao Yai National Park, Thailand AgEcon
Albers, Heidi J..
This paper discusses the application of a spatial-intertemporal model for tropical forest management to Khao Yai National Park in Thailand. This type of model, especially the spatial components, finds different optimal land allocations than do traditional models at empirically relevant levels of benefits. The spatial analysis here suggests that most of this park can be best used as a preserved area and also provides support for expanding the park into an adjacent unpopulated area. The analysis demonstrates that the park's benefits to regional agriculture and villagers are large enough that preservation can proceed without international support, and that local people, as a group, have incentives to maintain most of the area as preserved land. Although the...
Tipo: Working or Discussion Paper Palavras-chave: Parks; Protected areas; People-park conflict; Spatial; Biodiversity; Option value; Resource /Energy Economics and Policy; Q2; Q15; O13.
Ano: 2001 URL: http://purl.umn.edu/10751
Imagem não selecionada

Imprime registro no formato completo
Analysis of Spatial Variation in Flood Risk Perception AgEcon
Atreya, Ajita; Susana, Ferreira.
We use hedonic property models to estimate the spatial variation in flood risk in the city of Albany, GA. In addition to knowing whether a property is in the floodplain, we have a unique dataset with actual inundation maps from tropical storm Alberto that hit Albany in 1994. In the absence of information on the structural damages caused by a flood, having information on the actual inundated area can be useful to tease out information effect of a new flood from potential reconstruction cost. We find that the discount in actually inundated properties is larger which supports our hypothesis that homeowners respond better to what they have visualized (“seeing is believing”) and also the potential reconstruction cost in addition to information effect is...
Tipo: Presentation Palavras-chave: Flood Risk; Inundation; Spatial; Discount; Environmental Economics and Policy; Land Economics/Use; Q; R.
Ano: 2012 URL: http://purl.umn.edu/119738
Imagem não selecionada

Imprime registro no formato completo
Demand-Side Factors in Optimal Land Conservation Choice AgEcon
Ando, Amy Whritenour; Shah, Payal.
The dominant paradigm of conservation-reserve planning in economics is to optimize the provision of physical conservation benefits (measured in units like species protected) given a budget constraint. Large-scale biology-based priority setting implies that the value we place on biodiversity and ecosystem function is not affected by human proximity to that natural capital. There is significant evidence, however, that human willingness to pay (WTP) for conservation declines with distance (e.g. Loomis 2000) – a phenomenon we refer to as “spatial value decay”. This paper begins a new strand of the conservation planning literature that takes demand-side factors – the location of people in the landscape and the degree to which their willingness to pay for an...
Tipo: Conference Paper or Presentation Palavras-chave: Conservation; Endangered species; Optimal reserve-site selection; Spatial; Demand-side; Environmental Economics and Policy; Resource /Energy Economics and Policy; Q24; Q57.
Ano: 2009 URL: http://purl.umn.edu/49209
Imagem não selecionada

Imprime registro no formato completo
Development in the Midst of Drought: Evaluating an Agricultural Extension and Credit Program in Nicaragua. AgEcon
Mullally, Conner.
This paper measures the impact of year one of the Millennium Challenge Corporation’s Rural Business Development program for small rice farming households on the Pacific Coast of Nicaragua. The program was rolled out in the 2009-2010 agricultural year, which was the driest year on record in the region, likely due to an El Niño event. Estimated impacts show that the program at best had no effect, and at worst led to a 10 percent reduction in yields. These impacts are estimated using an econometric model which uses selection on observables as its identifying assumption, and robustness checks suggest that this is a reasonable approach in this case. Inference accounts for spatial correlation across households of the unobserved determinants of agricultural...
Tipo: Conference Paper or Presentation Palavras-chave: Development; Impact evaluation; Agricultural extension; Rural credit; Spatial; International Development.
Ano: 2011 URL: http://purl.umn.edu/103799
Imagem não selecionada

Imprime registro no formato completo
Development in the Midst of Drought: Evaluating an Agricultural Extension and Credit Program in Nicaragua. AgEcon
Mullally, Conner.
This essay is an evaluation of year one of the Rural Business Development (RBD) program for small rice farmers in León, Nicaragua. The RBD program is administered by the Millennium Challenge Corporation, and is designed to deliver agricultural extension advice and affordable credit in the form of inputs to farm households. This essay estimates the average impact of the program on rice yields and revenues utilizing inverse propensity score weighting combined with linear regression. In conducting statistical inference, it also accounts for the fact that agricultural outcomes are likely correlated over space in a small area such as the one studied here. The results suggest that the program had no impact on average, likely due to the presence of a severe...
Tipo: Conference Paper or Presentation Palavras-chave: Development; Extension; Credit; Spatial; Impact evaluation; International Development.
Ano: 2011 URL: http://purl.umn.edu/108723
Imagem não selecionada

Imprime registro no formato completo
Development in the Midst of Drought: Evaluating an Agricultural Extension and Credit Program in Nicaragua. AgEcon
Mullally, Conner.
Abstract: This essay is an evaluation of year one of the Rural Business Development (RBD) program for small rice farmers in León, Nicaragua. The RBD program is administered by the Millennium Challenge Corporation, and is designed to deliver agricultural extension advice and affordable credit in the form of inputs to farm households. This essay estimates the average impact of the program on rice yields and revenues utilizing inverse propensity score weighting combined with linear regression. In conducting statistical inference, it also accounts for the fact that agricultural outcomes are likely correlated over space in a small area such as the one studied here. The results suggest that the program had no impact on average, likely due to the presence of a...
Tipo: Conference Paper or Presentation Palavras-chave: Development; Agriculture; Extension; Credit; Spatial; Propensity score; International Development.
Ano: 2011 URL: http://purl.umn.edu/108498
Imagem não selecionada

Imprime registro no formato completo
Economics of controlling invasive species: a stochastic optimisation model for a spatial-dynamic process AgEcon
Chalak, Morteza; Pannell, David J.; Polyakov, Maksym.
Invasive species are significant threats to biodiversity, natural ecosystems and agriculture leading to large worldwide economic and environmental damage. Spread and control of invasive species are stochastic processes with important spatial dimensions. Most economic studies of invasive species control ignore spatial and stochastic aspects. This paper covers this gap in the previous studies by analysing a spatially explicit dynamic process of controlling invasive species in a stochastic setting. We show how stochasticity, spatial location of infestation and control can influence the spread, control efficiency and optimal control strategies. The main aim of this paper is to analyse the relationship between economic parameters and stochastic spatial...
Tipo: Conference Paper or Presentation Palavras-chave: Spatial; Dynamics; Invasive; Economics; Stochastic; Optimisation; Environmental Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/103325
Imagem não selecionada

Imprime registro no formato completo
Etude des sources d'alimentation potentielles des larves de l'huître perlière à l'échelle d'un lagon des Tuamotu, Ahe (Polynésie Française) ArchiMer
Mazzella, Audrey.
This work is part of a general study aiming at the modelling growth and dispersion of the larvae of Pinctada margaritifera in the lagoon of Ahe atoll (Tuamotu, French Polynesia). The general objective of this study is to set up a model coupling the growth and the dispersal of chlorophyll and particulate matter according to different spatial and temporal scales. Totally 1111 samples were taken in 12 stations from April 21st to May 28th, 2007. The speed and the direction of the wind bad a significant effect on the different parameters. The depth has not influence on the variations of the chlorophyll and the particulate matter that of their quality descriptors (proportion of cells lower than 2 µm, that of the phaeopigments and the organic matter). A...
Tipo: Text Palavras-chave: Ahe; Collectage; Temporel; Spatial; Chlorophylle; Phéopigments; Matières en suspension; Matière minérale; Matière organique.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/00426/53794/54709.pdf
Imagem não selecionada

Imprime registro no formato completo
How Do Homebuyers Value Different Types of Green Space? AgEcon
Bark, Rosalind H.; Osgood, Daniel E.; Colby, Bonnie G.; Halper, Eve B..
It is important to understand tradeoffs in preferences for natural and constructed green space in semi-arid urban areas because these lands compete for scarce water resources. We perform a hedonic study using high resolution, remotely-sensed vegetation indices and house sales records. We find that homebuyers in the study area prefer greener lots, greener neighborhoods, and greener nearby riparian corridors, and they pay premiums for proximity to green space amenities. The findings have fundamental implications for the efficient allocation of limited water supplies between different types of green space and for native vegetation conservation in semi-arid metropolitan areas.
Tipo: Journal Article Palavras-chave: Hedonic model; Locally weighted regression; Spatial; Open space; Golf course; Park; Riparian; Consumer/Household Economics; Land Economics/Use.
Ano: 2011 URL: http://purl.umn.edu/117210
Imagem não selecionada

Imprime registro no formato completo
Insights from the Guatemalan food system: an application of exploratory spatial data analysis techniques for food security analysis AgEcon
Alcaraz V., Gabriela; Zeller, Manfred.
The achievement of food security for all remains one of the main development objectives worldwide. Most commonly, non-spatial models are developed for either explaining the underlying determinants of food insecurity and undernourishment or for predicting their changes, so as for identifying vulnerable groups for targeting support. Such approach ignores geographic determinants and the spatial dependency of food security and nutrition outcomes. This paper seeks to address this issue. We use nationally representative data from Guatemala, which faces high and rising rates of undernourishment and child stunting in spite of the efforts engaged on their reduction. Through exploratory spatial data analysis and overlay techniques, some elements embedded in the food...
Tipo: Conference Paper or Presentation Palavras-chave: Food-system; Spatial; Guatemala; Food Consumption/Nutrition/Food Safety; Food Security and Poverty; Research Methods/ Statistical Methods.
Ano: 2009 URL: http://purl.umn.edu/51488
Imagem não selecionada

Imprime registro no formato completo
ISIS-Fish, a generic and spatially explicit simulation tool for evaluating the impact of management measures on fisheries dynamics ArchiMer
Mahevas, Stephanie; Pelletier, Dominique.
Assessing the impact of management scenarii on multi-species multi-fleet fisheries requires spatially and seasonally explicit simulation tools. No such tools are currently available in fisheries science. This paper presents a software that evaluates the impact of management measures on the dynamics of a complex fishery. The simulation model is generic in order to be used for different types of fisheries. Existing knowledge about each fishery is stored in a database included in the software, and may be easily modified. This includes the parameters describing each population and each fishing activity. Furthermore, the software allows for flexibility in several model assumptions. Both management measures and behaviour of fishermen in reaction to these...
Tipo: Text Palavras-chave: Management measures; Fisheries dynamics; Complex systems; Spatial; Integration of knowledge; Simulation tool.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-1133.pdf
Imagem não selecionada

Imprime registro no formato completo
Managing Fisheries in the context of an integrated policy: the importance of spatial issues ArchiMer
Petitgas, Pierre; Ernande, Bruno; Andonegi, Eider; Fabi, Gianna; Scarcella, Guiseppe; Kapiris, Kostas; Leocadio, Ana.
A variety of conservation policies now frame the management of fishing activity and so do also the spatial planning of different sectorial activities. These framework policies are additional to classical fishery management. There is a risk that the policies applying on the marine system are not coherent from a fisheries point of view. The spatial management of fishing activity at regional scale has the potential to meet multiple management objectives, on a habitat basis. Here we consider how to integrate multiple objectives of different policies into integrated ocean management scenarios. In the EU, European Directives and the CFP are now implementing the ecosystem approach to the management of human activity at sea. In this context, we further identify...
Tipo: Text Palavras-chave: Ecosystem approach; Integration; Spatial; Policy.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00353/46380/46002.pdf
Imagem não selecionada

Imprime registro no formato completo
Measuring Regional Productivity Differences in the Australian Wool Industry: A Metafrontier Approach AgEcon
Villano, Renato A.; Fleming, Euan M.; Fleming, Pauline.
Using panel data, we estimate technology gaps for four distinct sheep-producing regions in Eastern Australia (Northern New South Wales, Central and South-Eastern New South Wales, South-Western New South Wales and South-West Victoria) that reflect spatial environmental and technological differences in wool production. A deterministic stochastic metafrontier production function model is estimated that envelops the stochastic frontiers of the four regions. This metafrontier approach enables us to estimate the environment-technology gap ratio that reflects these spatial differences in the environment and variations in production technologies in the wool enterprise for benchmarked farmers in each region. As a result, a more accurate estimation is possible of...
Tipo: Conference Paper or Presentation Palavras-chave: Efficiency; Productivity; Metafrontier; Technology Gaps; Wool Production; Spatial; Livestock Production/Industries; Productivity Analysis; Research Methods/ Statistical Methods.
Ano: 2008 URL: http://purl.umn.edu/6036
Imagem não selecionada

Imprime registro no formato completo
Measuring the Contribution of Water and Green Space Amenities to Housing Values: An Application and Comparison of Spatially Weighted Hedonic Models AgEcon
Cho, Seong-Hoon; Bowker, James Michael; Park, William M..
This study estimates the influence of proximity to water bodies and park amenities on residential housing values in Knox County, Tennessee, using the hedonic price approach. Values for proximity to water bodies and parks are first estimated globally with a standard ordinary least squares (OLS) model. A locally weighted regression model is then employed to investigate spatial nonstationarity and generate local estimates for individual sources of each amenity. The local model reveals some important local differences in the effects of proximity to water bodies and parks on housing price.
Tipo: Journal Article Palavras-chave: Hedonic model; Locally weighted regression; Park; Spatial; Water bodies; Resource /Energy Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/8630
Imagem não selecionada

Imprime registro no formato completo
Scale and ecosystem services: how do observation, management, and analysis shift with scale—lessons from Québec Ecology and Society
Raudsepp-Hearne, Ciara; McGill University; ciara.rh@gmail.com; Peterson, Garry D; Stockholm Resilience Centre, Stockholm University; garry.peterson@su.se.
Ecosystem service assessment and management are shaped by the scale at which they are conducted; however, there has been little systematic investigation of the scales associated with ecosystem service processes, such as production, benefit distribution, and management. We examined how social-ecological spatial scale impacts ecosystem service assessment by comparing how ecosystem service distribution, trade-offs, and bundles shift across spatial scales. We used a case study in Québec, Canada, to analyze the scales of production, consumption, and management of 12 ecosystem services and to analyze how interactions among 7 of these ecosystem services change across 3 scales of observation (1, 9, and 75 km²). We found that ecosystem service...
Tipo: Peer-Reviewed Reports Palavras-chave: Covariance; Ecosystem service bundles; Mont Saint-Hilaire; Problem of fit; Scaling; Social-ecological; Spatial; Trade-offs.
Ano: 2016
Imagem não selecionada

Imprime registro no formato completo
Simulation de la dynamique de pêcherie : modélisation, complexité et incertitude ArchiMer
Mahevas, Stephanie.
Fisheries are defined by a set of fishermen and of marine populations impacting each other in a spatial-limited marine ecosystem. Within the over-exploitation context and according to ratified sustainable management objectives, my research has been focused on the development and a caution use of a mechanistic model describing fisheries dynamics. This model allows for integrating existing knowledge of fisheries. It aims at improving the understanding of fisheries functioning and at investigating the impact of fishing regulations on fisheries dynamics. This modelling exercise has supported many methodological developments for its parametrisation and its use in uncertainty context. Concerned with promoting a correct use of a complex model (that ambiguity link...
Tipo: Text Palavras-chave: Statistics; Spatial; Management; Optimal complexity; Sensitivity; ISIS Fish; Statistiques; Spatial; Gestion; Complexité optimale; Sensibilité; ISIS Fish.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/these-7302.pdf
Imagem não selecionada

Imprime registro no formato completo
Spatial Disadvantages or Spatial Poverty Traps: Household Evidence from Rural Kenya. AgEcon
Burke, William J.; Jayne, Thomas S..
The goals of this study are: 1) to determine the relative importance of spatial factors in explaining household wealth; 2) to identify the spatial characteristics of the chronically poorest, the consistently well off, and households escaping from poverty as well as descending into poverty; 3) to determine effects of compound disadvantages on the likelihood of chronic poverty; and 4) to assess the evidence of spatial poverty traps (SPTs). Quantitative analysis is conducted using panel data collected from 1275 households, each surveyed four times with a structured questionnaire over an 11 year period from 1997 to 2007. We identified four distinct groups. The chronically poor are defined as households remaining consistently in the bottom third (tercile) of...
Tipo: Report Palavras-chave: Africa; Food security; Kenya; Spatial; Poverty; Food Security and Poverty; Q18.
Ano: 2008 URL: http://purl.umn.edu/54560
Imagem não selecionada

Imprime registro no formato completo
Sponge beta diversity in the Spermonde Archipelago, SW Sulawesi, Indonesia Naturalis
Voogd, N.J. de; Cleary, D.F.R.; Hoeksema, B.W.; Noor, A.; Soest, R.W.M. van.
Sponge assemblages were investigated in the Spermonde Archipelago, southwestern Sulawesi, Indonesia. In this study spatial patterns of sponge similarity among sites were significantly related to remotely sensed environmental variables, the degree of human settlement and depth, but not to the distance between sites. Both oviparous and viviparous species groups responded to similar environmental constraints, and differences in similarity were unrelated to the distance between sites. The degree of human settlement, however, was significantly related to variation in the composition of viviparous, but not oviparous species. Our results demonstrate, most importantly, the utility of remotely sensed data in predicting the spatial turnover of diverse species...
Tipo: Article / Letter to the editor Palavras-chave: Biodiversity; Indonesia; Porifera; Similarity; Spatial; 42.72.
Ano: 2006 URL: http://www.repository.naturalis.nl/record/227743
Imagem não selecionada

Imprime registro no formato completo
The Agglomeration Vickrey Auction for the promotion of spatially contiguous habitat management: Theoretical foundations and numerical illustrations AgEcon
Banerjee, Simanti; Shortle, James S.; Kwasnica, Anthony M..
There is much interest among economists and policy makers in the use of reverse auctions to purchase habitat conservation on private lands as a mechanism for minimizing public expenditures to achieve desired conservation outcomes. Examples are the Conservation Reserve Program (US) and Environmental Stewardship Scheme (UK). An important limitation of these auctions as implemented to date is that there is no explicit consideration of the spatial pattern of participation in the evaluation of bids. In this study we present the structure of a simple auction – the Agglomeration Vickrey Auction that implements a Vickrey-Clarke-Groves mechanism. The auction is designed to attain conservation goals through specific spatial patterns of land management while...
Tipo: Conference Paper or Presentation Palavras-chave: Auctions; Environmental conservation; Spatial; Environmental Economics and Policy; Land Economics/Use.
Ano: 2009 URL: http://purl.umn.edu/49337
Imagem não selecionada

Imprime registro no formato completo
The Cost of Coexistence between Bt Maize and Open Pollinated Maize Varieties in Lowland Coastal Kenya AgEcon
Tumusiime, Emmanuel; De Groote, Hugo; Vitale, Jeffrey D.; Adam, Brian D..
Kenya is currently in the process of introducing genetically modified maize (Bt maize). A major concern is that the Bt gene might cross into local varieties through cross pollination. Current regulatory strategies to ensure coexistence of the two cropping systems at the farm level rely on spatial isolation measures-separation distances and/or buffer zones. However, the interaction of practical measures and costs of spatial isolation with the farmer’s economic incentive to plant a Bt maize crop have not been studied in Kenya. The purpose of this study was to analyze the technical and economic feasibility of the implementation of spatial coexistence measures. Using spatial geo-referenced data from the actual agricultural landscape in lowland coastal Kenya,...
Tipo: Conference Paper or Presentation Palavras-chave: Coexistence; Regulatory; Spatial; Agro-ecological zone; GM crops; Resource /Energy Economics and Policy.
Ano: 2009 URL: http://purl.umn.edu/46726
Registros recuperados: 25
Primeira ... 12 ... Última
 

Empresa Brasileira de Pesquisa Agropecuária - Embrapa
Todos os direitos reservados, conforme Lei n° 9.610
Política de Privacidade
Área restrita

Embrapa
Parque Estação Biológica - PqEB s/n°
Brasília, DF - Brasil - CEP 70770-901
Fone: (61) 3448-4433 - Fax: (61) 3448-4890 / 3448-4891 SAC: https://www.embrapa.br/fale-conosco

Valid HTML 4.01 Transitional