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Registros recuperados: 109
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Forest Amenities and Location Choice in the Southwest AgEcon
Hand, Michael S.; Thacher, Jennifer A.; McCollum, Daniel W.; Berrens, Robert P..
Locations with natural characteristics, such as forest, are thought to be attractive residential locations. This proposition is tested in the Southwest United States, composed of Arizona and New Mexico. This paper presents a conditional logit model of location choice estimated with household observations from the U.S census, geographic information system (GIS) data, and county-level data. Results suggest that forest area, both in one's own location and nearby, increases the probability of choosing a location. But significant heterogeneity in location choices exists; an income effect and life-cycle effects on the demand for forest amenities appear to determine location choices.
Tipo: Journal Article Palavras-chave: Amenities; Conditional logit; Forest; Location choice; Southwest; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/42462
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MODELING ECOLOGICAL CONSTRAINTS ON TROPICAL FOREST MANAGEMENT: COMMENT AgEcon
Barrett, Christopher B.; Batabyal, Amitrajeet A..
We comment on four aspects of Albers' [1] model of ecological constraints on tropical forest management. Albers structures her model in a highly asymmetric manner, with strong, uniform biases against development and in favor of preservation. Despite Albers' repeated claims that her model is "complete" and that it has significant implications for tropical forest management, we contend instead that the results of a truly general, empirically defensible model are inherently ambiguous. Spatial and intertemporal dimensions clearly matter, but they do not point as neatly in favor of preservation as Albers would have us believe. Note: Forthcoming in Journal of Environmental Economics and Management
Tipo: Working or Discussion Paper Palavras-chave: Forest; Interdependence; Irreversibility; Management; Uncertainty; Resource /Energy Economics and Policy; D81; Q15; Q23.
Ano: 1996 URL: http://purl.umn.edu/28371
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Greenhouse Gas Emission Factor Module: Land Use in Rural New Zealand—Climate Version 1 AgEcon
Hendy, Joanna; Kerr, Suzi.
Several different New Zealand economic models produce measures of rural economic activity that have greenhouse gas implications. For climate change analysis, models need to translate economic activity into greenhouse gas emissions. This document estimates functions and creates projections for land-use related greenhouse gas emissions per unit of economic activity that are simple; are based on readily available data and strong science; are consistent with the national inventory in 2002; evolve so that implied net emissions approximately match past inventory totals (1990–2002); and can be linked easily to a variety of models so they can be used in simulations. We estimate dynamic greenhouse gas emission functions for five land uses: dairy, sheep, beef,...
Tipo: Conference Paper or Presentation Palavras-chave: Climate change; Greenhouse gases; Methane; Nitrous oxide; Carbon dioxide; Scrub; Forest; Agricultural and Food Policy; Crop Production/Industries; Environmental Economics and Policy; Food Consumption/Nutrition/Food Safety; International Relations/Trade; Research Methods/ Statistical Methods; Resource /Energy Economics and Policy.
Ano: 2005 URL: http://purl.umn.edu/98501
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Economic Valuation of Forest Ecosystem Services: Methodology and Monetary Estimates AgEcon
Chiabai, Aline; Travisi, Chiara M.; Ding, Helen; Markandya, Anil; Nunes, Paulo A.L.D..
By using ad hoc value transfer protocols, this paper offers a methodological contribution and provides accurate per hectare estimates of the economic value of some selected ecosystem services for all forest biomes in the world, identified following the Millennium Ecosystem Assessment taxonomy MEA. The research also estimates potential total economic losses from policy inaction in year 2050. Final results show that total losses are significant. The total figure is €78 billion, the greatest losses coming from North America and Mexico, followed by Africa, Russia and some Asiatic countries. Most of this loss is attributable to provisioning services and carbon sequestration, while only a minor part is due to loss of cultural services. In terms of biomes the...
Tipo: Working or Discussion Paper Palavras-chave: Forest; Ecosystem Services; Biodiversity; Valuation; Value Transfer; Environmental Economics and Policy; O13; Q23; Q26; Q51; Q54; Q57.
Ano: 2009 URL: http://purl.umn.edu/50361
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Disposition of precipitation: Supply and Demand for Water Use by New Tree Plantations AgEcon
Nordblom, Thomas L.; Finlayson, John D.; Hume, Iain H..
As the greatest rainwater users among all vegetative land covers, tree plantations have been employed strategically to mitigate salinity and water-logging problems. However, large-scale commercial tree plantations in high rainfall areas reduce fresh water inflows to river systems supporting downstream communities, agricultural industries and wetland environmental assets. A bio-economic model was used to estimate economic demand for water by future upstream plantations in a sub-catchment (the 2.8 million ha Macquarie valley in NSW) of the Murray-Darling Basin, Australia. Given four tree-product values, impacts were simulated under two settings: without and with the requirement that permanent water entitlements be purchased from downstream entitlement...
Tipo: Conference Paper or Presentation Palavras-chave: Environmental Economics and Policy; Forest; Environmental services; Catchment; Water sources; Interception; Entitlement; Supply; Demand; Market; Economic surplus; Evapo-transpiration; Urban water; Irrigation; Wetlands..
Ano: 2011 URL: http://purl.umn.edu/101225
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Collective Action to Secure Property Rights for the Poor: A Case Study in Jambi Province, Indonesia AgEcon
Komarudin, Heru; Siagian, Yuliana L.; Colfer, Carol.
This study presents an approach to analyzing decentralized forestry and natural resource management and land property rights issues, and catalyzing collective action among villages and district governments. It focuses on understanding the current policies governing local people’s access to property rights and decision making processes, and learning how collective action among community groups and interaction among stakeholders can enhance local people’s rights over lands, resources, and policy processes for development. The authors applied participatory action research in two villages, one each in the Bungo and Tanjabbar districts of Jambi province (Sumatra), Indonesia, to facilitate identification of priorities through phases of planning, action,...
Tipo: Conference Paper or Presentation Palavras-chave: Decentralization; Natural resource management; Forest; Collective action; Property rights; Action research; Indonesia; Food Security and Poverty; Resource /Energy Economics and Policy.
Ano: 2008 URL: http://purl.umn.edu/44363
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Marion Clawson's Contribution to Forestry AgEcon
Sedjo, Roger A..
Marion Clawson passed away in April 1998 at the age of 92. He was a giant in the field of resource and environmental economics who devoted the last decade and one-half of his professional career to forest and forest related issues. He produced over 30 professional books and hundreds of papers. This paper presents a broad overview of his career as an economist, with a focus on his work in and influence on forestry and forest policy. From the early 1970s through to his last professional book in 1983, and his final professional contributions in the mid 1990s, Clawson devoted most of his professional efforts to forest issues. His influence on forests and forest policy was substantial, especially in the context of public policy toward America's publicly owned...
Tipo: Working or Discussion Paper Palavras-chave: Marion Clawson; Forest; Economics; Resources; Policy; Timber; Recreation; History; Resource /Energy Economics and Policy; B31; Q10; Q20; Q23; Q24; Q26; Q28.
Ano: 1999 URL: http://purl.umn.edu/10755
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Traditional Natural Resources Management Practices and Biodiversity Conservation in Ghana: A Review of Local Concepts and Issues on Change and Sustainability AgEcon
Sarfo-Mensah, Paul; Oduro, William.
This paper reviews the importance of traditional natural resources management practices in Ghana. It highlights the roles of traditional beliefs, taboos and rituals in the management and conservation of key natural resources in the country. The paper is based on desk studies undertaken as part of anthropological studies conducted in the forest-savanna transitional agroecological zone of Ghana to study the spirituality of forests and conservation. Among the major conclusions of the paper is that although the potential of traditional natural resources management for biodiversity conservation in Ghana is enormous, the sustainability of these practices is seriously threatened. This stems from the rapid changes in the belief systems. Both biophysical and...
Tipo: Working or Discussion Paper Palavras-chave: Forest; Savanna transition; Sacred groves; Traditional beliefs; Biodiversity conservation; Change and sustainability; Resource /Energy Economics and Policy; Q2; Q57.
Ano: 2007 URL: http://purl.umn.edu/7440
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Constraints or Cooperation? Determinants of Secondary Forest Cover Under Shifting Cultivation AgEcon
Klemick, Heather.
This study examines the drivers of land use in a shifting cultivation system with forest fallow. Forest fallow provides on-farm soil quality benefits, local hydrological regulation, and global public goods. An optimal control model demonstrates that farmers have an incentive to fallow less than is socially optimal, though market failures limiting crop production can have a countervailing effect by encouraging fallow. An econometric model estimated using data from the Brazilian Amazon suggests that fallowing does not result from internalization of local fallow services but instead is associated with poor market access and labor and liquidity constraints.
Tipo: Article Palavras-chave: Forest; Farms; Fallow; Ecosystem services; Land use; Spatial econometrics; Brazil; Credit; International Development; Land Economics/Use.
Ano: 2011 URL: http://purl.umn.edu/120270
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ON SOME ASPECTS OF THE MANAGEMENT OF A STOCHASTICALLY DEVELOPING FOREST AgEcon
Batabyal, Amitrajeet A..
In this paper I focus on some important biological aspects of the forest management problem. I model a stochastically developing forest as a multidimensional, continuous-time Markov chain. Next, I pose three questions concerning the long-run characteristics of a stationary forest, the stochastic process followed by dying species, and the age of an arbitrary species in the forest. I then (a) characterize a stationary forest probabilistically, (b) describe the stochastic process governing the demise of species in this forest, and (c) provide a method for determining the age of an arbitrary species in the forest. Finally, I discuss the forest management implications of the issues raised in this paper. Note: Published in Ecological Modelling 89(1-3,...
Tipo: Working or Discussion Paper Palavras-chave: Forest; Management; Continuous-time Markov chain; Resource /Energy Economics and Policy.
Ano: 1996 URL: http://purl.umn.edu/28361
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Competitividade do SAG da silvicultura no Mato Grosso do Sul: um enfoque sobre as florestas plantadas de eucalipto AgEcon
Fagundes, Mayra Batista Bitencourt; Schmidt, Vanessa.
The eucalyptus plantations constitute a major segment of the Agribusiness System of Forestry in Mato Grosso do Sul, thus, this study has focused primarily examine the competitiveness of this segment by applying a quantitative methodology for analyzing economic results called Quasi-Income, stating ultimately its competitiveness. Moreover, to capture the information held visiting the institutional actors directly connected to the system, which also allowed the identification of strengths – such as a favorable climate, large areas for forest planting , policy environment, wellstructured and very active, new arrivals agents that complement the chains, rates of return and profitability positive; and negative – failing infrastructure for disposal of raw...
Tipo: Article Palavras-chave: Forest; Quasi Rent; System; Land Economics/Use; Resource /Energy Economics and Policy.
Ano: 2011 URL: http://purl.umn.edu/121298
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Tariff Liberalization, Wood Trade Flows, and Global Forests AgEcon
Sedjo, Roger A.; Simpson, R. David.
This paper examines the question of the likely effects on global forests of a further reduction in wood products tariffs including both solid wood products and pulp and paper, as has been proposed to the World Trade Organization (WTO) by the Asia Pacific Economic Community (APEC). The tariff reductions would be an extension of the tariff reductions associated with the Uruguay Round (Federal Register 1999). The questions include both how international trade is likely to change in response to further tariff reduction and also the implications for timber harvests and forests generally of such trade liberalization in the various forest regions. The paper finds that the evidence suggests further reductions in tariffs on forest products are likely to generate...
Tipo: Working or Discussion Paper Palavras-chave: International trade; Tariffs; Forest; Forest products; World Trade Organization; Resource /Energy Economics and Policy; F01; F21; F13; Q23.
Ano: 1999 URL: http://purl.umn.edu/10557
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The effect of forest land use on the cost of drinking water supply: A spatial econometric analysis AgEcon
Abildtrup, Jens; Garcia, Serge; Stenger, Anne.
Forest land use is often associated with the protection of water resources from contamination and the reduced cost of drinking water supply. This study attempted to measure the value of the forest on the quality of water resources from a contingent market, namely drinking water supply, by estimating variations in drinking water costs as a function of variations in land uses. Spatial correlations were taken into account because of the use of different geographical scales (i.e., water service area and land uses) and the potential existence of organizational and technological spillovers between water services. We found a significant negative effect of forest land use on water costs. We found no evidence of spatial spillovers concerning the management regime...
Tipo: Presentation Palavras-chave: Water quality; Land uses; Forest; Water supply service; Spatial spillovers; Demand and Price Analysis; Land Economics/Use; Resource /Energy Economics and Policy; C21; Q23; Q25; R14.
Ano: 2011 URL: http://purl.umn.edu/120385
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Floristic composition and topographic variation in a tidal floodplain forest in the Amazon Estuary Rev. Bras. Bot.
CATTANIO,JOSÉ H.; ANDERSON,ANTHONY B.; CARVALHO,MANOEL S..
Slight topographic variations appear to exert dramatic effects on the structure of forests subject to inundation. In a late successional tidal floodplain forest near the Amazon port of Belém, Brazil, we examined these effects by studying floristic composition along a topographic gradient. We predicted that, relative to high sites, low sites would be characterized by high representation of life forms and taxa characteristic of inundated sites. We found striking variations in floristic composition along a slight topographic gradient. In comparison with topographically high sites, low sites were characterized by a high representation of Palm trees (Arecaceae), low diversity of trees and lianas, and high plant density. These variations appear to reflect...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Floodplain; Floristic; Forest; Topography; Várzea.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042002012000006
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Alterations in the lipid and soluble sugar content of melanoxylon brauna seeds during natural and accelerated ageing Rev. bras. sementes
Corte,Viviana Borges; Borges,Eduardo Euclydes de Lima e; Gonçalves,José Francisco de Carvalho; Silva,Mirian Sousa.
The decay of seeds is irreversible and at best can only be delayed by applying techniques that reduce the velocity of the metabolic reactions involved. There is little information on the biochemistry of tropical forest tree seeds related to their storability. It was investigated the influence of the composition of lipids and soluble sugars of two storage compartments, the cotyledons and the embryonic axis, of Melanoxylon brauna Schot. (Leguminosae- Caesalpinioideae), a hardwood known as black brauna, seeds stored at 20 ºC for 0, 3, 6, 9 and 12 months (natural ageing) and for 0, 24, 48, 72 and 96 hours at 40 ºC (accelerated ageing). The levels of fatty acids and monosaccharides varied differentially in each of the embryo storage compartments. Changes in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Carbohydrates; Forest; Lipids; Native species; Storage.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-31222010000300017
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Occurrence of diazotrophic bacteria in Araucaria angustifolia Scientia Agricola
Neroni,Rafaela de Fátima; Cardoso,Elke Jurandy Bran Nogueira.
Araucaria angustifolia is an environmentally threatened tree and the whole biota of the Araucaria Forest should be investigated with the aim of its preservation. Diazotrophic bacteria are extremely important for the maintenance of ecosystems, but they have never been studied in Araucaria Forests. In this study, diazotrophic bacteria were isolated from Araucaria roots and soil, when grown in semi-specific, semi-solid media. The diazotrophic character of some recovered isolates could be confirmed using the acetylene reduction assay. According to their 16S rRNA sequences, most of these isolates belong to the genus Burkholderia.
Tipo: Info:eu-repo/semantics/report Palavras-chave: Biological nitrogen fixation; Endophytic bacteria; Rhizosphere; Forest.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162007000300015
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Patterns of diversity and abundance of fungus-growing ants (Formicidae: Attini) in areas of the Brazilian Cerrado Zoologia
Vasconcelos,Heraldo L.; Araújo,Bruna B.; Mayhé-Nunes,Antonio J..
Fungus-growing ants (tribe Attini) are characteristic elements of the New World fauna. However, there is little information on the patterns of diversity, abundance, and distribution of attine species in their native ecosystems, especially for the so-called "lower" genera of the tribe. A survey of attine ant nests (excluding Atta Fabricus, 1804 and Acromyrmex Mayr, 1865) was conducted in a variety of savanna and forest habitats of the Cerrado biome near Uberlândia, Brazil. In total, 314 nests from 21 species of nine genera were found. Trachymyrmex Forel, 1893 was the most diverse genus with 10 species. Eighteen species were found in the savannas, including Mycetagroicus cerradensis Brandão & Mayhé-Nunes, 2001, a species from a recently-described...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biodiversity; Community structure; Forest; Savanna; Trachymyrmex.
Ano: 2008 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752008000300009
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Mamíferos não-voadores do campus "Luiz de Queiroz", Universidade de São Paulo, Piracicaba, Brasil Zoologia
Gheler-Costa,Carla; Verdade,Luciano M.; Almeida,Álvaro F. de.
The remaining portion of the Atlantic Forest within the State of Sao Paulo is highly fragmented and most of the remainders are wrapped up in an essentially agricultural mosaic. This study aims at the local surveying of non-volant mammals, including their distribution and relative abundance within the human-altered environments of campus "Luiz de Queiroz", University of Sao Paulo, Piracicaba, São Paulo State, Brazil, an urbanized area bordered by two highways and the Piracicaba River. The landscape of the study area is characterized by a mosaic of small forest fragments surrounded by pastures, agriculture, and planted forests. Small mammals were captured from February to October, 2001, with an effort of 7056 day-traps, sampling the most representative...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Mammals; Forest; Agricultural mosaic; Landscapes.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752002000600021
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Leaf herbivory on three tree species in a monodominant and two other Terra firme forests on Maracá Island, Brazil Acta Amazonica
NASCIMENTO,Marcelo Τ.; PROCTOR,John.
The aim of this study was to test the hypothesis that the monodominant non-pioneer Peltogyne gracilipes, typically does not suffer density-dependent herbivory (Janzen-Connell model). Two components of intraspecific variation in leaf herbivory were measured: 1) the variation between individuals in the population at the same time and 2) the temporal variation in rates of damage to each individual. The study was carried out on Maracá Island, Roraima, Brazil in three plots (50 m χ 50 m) in each of three forest types: Peltogyne-rich forest (PRF), Peltogyne-poor forest (PPF), and forest without Peltogyne (FWP). Two other non-pioneer species (Ecclinusa guianensis and Pradosia surinamensis) were chosen for comparison because they were fairly abundant and their...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazonia; Density-dependent herbivory; Monodominant forest; Peltogyne; Terra firme; Forest.
Ano: 2001 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672001000100027
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Fruits and frugivores of the Brazilian Cerrado: ecological and phylogenetic considerations Acta Botanica
Kuhlmann,Marcelo; Ribeiro,José Felipe.
ABSTRACT Knowing the morphological and phylogenetic patterns of fruits of a plant community may elucidate plant-frugivore interactions, and analysis of dispersal syndromes is a practical approach to understanding these mutualisms. We investigated different zoochorous fruits and frugivorous animals among Cerrado formations (forest, savanna and grassland), mapped dispersal syndromes on a Cerrado angiosperm phylogeny and tested for phylogenetic signal. For a core region in Cerrado, we found that, among almost a thousand fruit species and 258 fruit-eating vertebrates, 60% of the fruits had an ornithochorous syndrome and that 70% of the frugivores were birds. Most fruit and frugivorous species (~80%) inhabit forest formations, but many of them also occurred in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Cerrado biome; Diaspores; Dispersal syndromes; Forest; Fruit-eating animals; Grassland; Plant-frugivore interactions; Phylogenetic signal; Savanna.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062016000300495
Registros recuperados: 109
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