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Registros recuperados: 32
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Agricultural Resources and Environmental Indicators, 2006 Edition AgEcon
Wiebe, Keith D.; Gollehon, Noel R..
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Tipo: Report Palavras-chave: ERS; AREI; Agricultural economics; Natural resources; Land; Land use; Land values; Land ownership; Water use; Irrigation; Water quality; Genetic resources; Biotechnology; Agricultural research; Agricultural productivity; Global resources; Soil conservation; Soil erosion; Pest management; Nutrient management; Animal agriculture; Organic agriculture; Conventional agriculture; Conservation policy; Land retirement; Working lands; Wetlands; Farmland protection; Environmental quality; Farm structure; Farm ownership; Farm management decisions; Farm business; Environmental Economics and Policy; Resource /Energy Economics and Policy.
Ano: 2006 URL: http://purl.umn.edu/7207
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An Econometric Analysis of the Environmental Benefits Provided by the Conservation Reserve Program AgEcon
Fleming, Ronald A..
Over $1.7 billion has been spent on the Conservation Reserve Program (CRP) since 1985. The purpose of this study is to show that these expenditures have aided the environment. Rather than quantify changes in environmental variables, a spatial econometric model is used to test if CRP enrollments are greater in counties with poorer environmental quality. In seven of nine regions, CRP enrollments are higher in counties with an environmental concern. This positive finding justifies past expenditures by the CRP and supports continued funding as an environmental program. The CRP is targeting current environmental concerns that will lead to future improvement.
Tipo: Journal Article Palavras-chave: Conservation Reserve Program; Econometrics; Environmental quality; Soil erosion; Spatial data; Water quality; Wildlife habitat; Q28; Q58; C31; Q24; Q25.
Ano: 2004 URL: http://purl.umn.edu/43388
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Assessing of biotic integrity of the fish community in a heavily impacted segment of a tropical river in Brazil BABT
Pinto,Benjamin Carvalho Teixeira; Araújo,Francisco Gerson.
A index of biotic integrity (IBI) was applied to assess the ecological health at seven sites of ca. 338 km extension of the Paraíba do Sul river, in bracketing a large urban-industrial complex. The aim was to evaluate the index response to changes in environmental quality during two seasons (winter/dry versus. summer/wet). Eight metrics were selected to IBI in three categories: 1) species richness and habitat composition; 2) indicator species; and 3) trophic structure. The IBI, based on the least impacted regional condition, showed the highest value at the most upstream site (Queluz=km 0) - Acceptable, then decreasing downstream and reaching the lowest record at Volta Redonda (km 125) - Impacted; afterwards there was an increasing quality toward the most...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish community; IBI; Environmental quality; Habitats; Tropical rivers; Biomonitoring.
Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132007000300015
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Benefits of Protecting Rural Water Quality: An Empirical Analysis AgEcon
Crutchfield, Stephen R.; Feather, Peter; Hellerstein, Daniel.
Concerns about the impact of farm production on the quality of the Nation's drinking and recreational water resources have risen over the past 10 years. Because point sources of pollution were controlled first, agricultural nonpoint sources have become the Nation's largest remaining single water-quality problem. Both public and private costs of policies that address the conflict between agricultural production and water quality are relevant, but measuring the off-farm benefits and costs of changing water quality is difficult. Many of the values placed on these resources are not measured in traditional ways through market prices. This report explores the use of nonmarket valuation methods to estimate the benefits of protecting or improving rural water...
Tipo: Report Palavras-chave: Water quality; Nonpoint source pollution; Environmental quality; Agricultural production; Costs; Benefits; Resource /Energy Economics and Policy.
Ano: 1995 URL: http://purl.umn.edu/33949
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Benefits of urban green spaces in noise, air quality and thermal comfort: the case study of Bragança IPB - Escola Superior Agrária
Feliciano, Manuel; Gonçalves, Artur; Ribeiro, A.C.; Nunes, Luís.
Urban green areas provide multiple environmental services, contributing to high-quality environments in our cities. With the purpose of evaluating the influence of urban green spaces in air quality, noise and thermal comfort, a research was developed throughout the last 4 years in the city of Bragança, Portugal. All these aspects were approached from physical and social perspectives. The physical approach involved several studies at urban and green space scales. Field experiments covered such areas as measurements of air pollutants concentrations (ozone, nitrogen dioxide, volatile organic compounds and PM10), sound pressure levels, meteorological and other parameters related to thermal comfort. The social approach consisted in assessing perceptions of...
Tipo: Other Palavras-chave: Urban forest; Environmental quality; Objective evaluation; Subjective evaluation.
Ano: 2010 URL: http://hdl.handle.net/10198/3236
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Cenário mundial dos recursos hídricos subterrâneos. Repositório Alice
GOMES, M. A. F.; PEREIRA, L. C..
Resumo: A escassez de água para consumo humano se faz presente em todo Planeta, representando um risco iminente para a sobrevivência da população mundial, sobretudo para aquela de países menos desenvolvidos. Como as águas superficiais têm sido as mais afetadas, seja pela disponibilidade reduzida, seja pela qualidade cada vez mais crítica, a busca pelas águas subterrâneas tem sido intensificada nas duas últimas décadas, tornando-as também escassas em vários países. Frente a esse cenário de degradação, torna-se urgente a adoção de medidas e ações que viabilizem a proteção dos mananciais subterrâneos, denominados aquíferos. Assim, o presente trabalho faz uma descrição e uma análise crítica desse cenário atual, abordando a situação dos principais aquíferos do...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Recurso Hídrico; Águas Subterrâneas; Water resources; Groundwater; Groundwater extraction; Environmental quality; Water conservation; Water pollution; Aquifers.
Ano: 2020 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1127621
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Demand for Urban Forests and Economic Welfare: Evidence from the Southeastern U.S. Cities AgEcon
Zhu, Pengyu; Zhang, Yaoqi.
This study examines the relationship between urban forests and household income and population density in the 149 cities with populations over 40,000 in nine southeastern states. Our empirical results show that urban forest percentage across the cities has characteristics of the environmental Kuznets curve. We find that household income around $39,000 is a threshold that changes the relationship between income and urban forest coverage from negative to positive, whereas the impact of population density on urban forests is just the opposite, from positive to negative when population density is around 180 persons per square kilometer.
Tipo: Journal Article Palavras-chave: Environmental Kuznets curve; Environmental quality; Income; Land use; Population density; Tree canopy; Community/Rural/Urban Development; Environmental Economics and Policy; Land Economics/Use; C31; Q23; Q56; Q57; R14.
Ano: 2006 URL: http://purl.umn.edu/43758
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Ecological assessment of a southeastern Brazil reservoir Biota Neotropica
Martins,Isabela; Sanches,Barbara; Kaufmann,Philip Robert; Hughes,Robert M.; Santos,Gilmar Bastos; Molozzi,Joseline; Callisto,Marcos.
Reservoirs are artificial ecosystems with multiple functions having direct and indirect benefits to humans; however, they also cause ecological changes and influence the composition and structure of aquatic biota. Our objectives were to: (1) assess the environmental condition of Nova Ponte Reservoir, Minas Gerais state, southeastern Brazil; and (2) determine how the aquatic biota respond to disturbances. A total of 40 sites in the littoral zone of the reservoir were sampled to characterize physical and chemical habitat, land use, and benthic macroinvertebrate and fish assemblages. The predominant type of land cover near the reservoir was natural vegetation. A total of 29 fish species and 39 macroinvertebrate taxa were collected, including eight alien...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reservoirs; Water quality; Bioindicators; Physical habitat; Environmental quality.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032015000100103
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Effects of agricultural and urban impacts on macroinvertebrates assemblages in streams (Rio Grande do Sul, Brazil) Rev. Bras. Zool.
Hepp,Luiz Ubiratan; Milesi,Silvia V.; Biasi,Cristiane; Restello,Rozane M..
This study evaluates the effects of agricultural and urban activities on the structure and composition of benthic communities of streams in the state of Rio Grande do Sul, Brazil. Benthic macroinvertebrates were collected in streams influenced by urbanization and agriculture and in streams with no anthropogenic disturbances (reference streams). Organism density was superior in urban streams when compared with streams in the other two areas. The taxonomic richness and Shannon diversity index were higher in reference streams. The benthic fauna composition was significantly different among land uses. The classification and ordination analyses corroborated the results of variance analyses demonstrating the formation of clusters corresponding to streams with...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biomonitoring; Environmental quality; Land uses.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000100016
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Fast immersion to test the stability of aggregates in water: consequences for interpreting results from tropical soil classes Agronomy
Silva, Rodrigo Fonseca da; Cipriano, Patriciani Estela; Siueia Junior, Matias; Mars, Geslin; Dias Junior, Moacir de Souza.
Aggregates are the primary structural components of soil and have been used as an indicator of soil quality in conservation systems. The objective of this study was to analyse the effect of slow pre-wetting on the results of the aggregate stability test for different classes of tropical soils. Data were arranged in a 2 x 4 factorial design with three replications, in which the first factor comprised the two methods of pre-treatment on soil aggregates: without pre-wetting (WOPW), which considered the moisture of the aggregates in the field, and with pre-wetting (WPW), which considered the slow wetting of aggregates through capillarity on wet filter paper for 24h. The second factor consisted of four soil classes: Typic Dystrustept (Cambissolo Aplico...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Soil structure; Environmental quality; Geometric mean diameter..
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/42453
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Fuzzy modeling in the prediction of climate indices and productive performance of quails kept in climate chamber REA
MARQUES,JORDÂNIO I.; LOPES NETO,JOSÉ P.; LOPES,FERNANDA F. DE M.; FURTADO,DERMEVAL A.; ARAÚJO,TIAGO G. P..
ABSTRACT With the demand in the production at large-scale food, confinement of animals has become a necessity of the productive process because of the increase in production capacity and optimization of the spaces reserved for creations. In this context, the aim of this study was the development and validation of models using fuzzy logic for predicting climate indices and productive performance of European quails kept in a climatic chamber. The model developed was analyzed from two points of view; the first one took into account the prediction of climate indexes where the input variables were the temperature (°C) and relative humidity (%) of the air. In the second, related to the prediction of productive performance, the input variables were air...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Coturniculture; Fuzzy logic; Productivity; Environmental quality.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000400604
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Green Giving: An Analysis of Contributions to Major U.S. Environmental Groups AgEcon
Richer, Jerrell.
Data are compiled from the tax records of 29 major environmental organizations for the period 1980-1994 to identify factors that influence voluntary contributions. I examine the effects of organizational characteristics, such as fundraising expenditures and alternative sources of revenue, along with the impact of general economic conditions and the political climate. I find that government grants to the organizations had a positive and statistically significant impact on voluntary contributions rather than a crowding out effect. Contributions were price inelastic, where the price is defined as the effective cost to the donor of achieving a one-dollar increase in the provision of program services. Resources devoted to fundraising had a strong and positive...
Tipo: Working or Discussion Paper Palavras-chave: Charitable giving; Conservation; Crowding out; Environmental quality; Fundraising; Nonprofit organizations; Public goods; Environmental Economics and Policy; Q0; H8.
Ano: 1995 URL: http://purl.umn.edu/10870
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Heavy metals in equine biological components R. Bras. Zootec.
Souza,Maria Verônica de; Fontes,Maurício Paulo Ferreira; Fernandes,Raphael Bragança Alves.
The objective of this research was to determine the concentration of heavy metals in the blood (Pb, Ni and Cd), serum (Cu and Zn) and hair (Pb, Ni, Cd, Cu and Zn) of horses raised in non-industrial and industrial areas (with steel mill), and to verify the possibility to use these data as indicators of environmental pollution. The samples were collected during summer and winter, aiming to verify animal contamination related to environment and season of the year. Copper and Zn contents determined in the serum and Cd and Ni contents obtained in the blood indicated no contamination effects of industries. For some animals, contents of Pb in the blood were higher than those considered acceptable for the species, but without relationship with industrialization...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Bio-indicators; Environmental monitoring; Environmental quality; Horses; Pollution.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982014000200002
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Histopathological evaluation of seven Amazon species of freshwater ornamental armored catfish. Repositório Alice
FUJIMOTO, R. Y.; NEVES, M. de S.; SANTOS, R. F. B.; CRUZ, C. da; DINIZ, D. G.; EIRAS, J. da C..
Fish commonly known as acaris or plecos are freshwater armored catfish economically important as a food resource and as ornamental fish. Most of these species are captured in the Amazon region. However, despite its economic importance, there is a lack of knowledge about their biological aspects. Thus, this study aimed to characterize and evaluate the histopathological aspects of important organs as gills, liver, integument and kidney of seven species of armored freshwater ornamental catfish from Guamá River, Pará State, Brazil. All organs showed typical characteristics of organs of other teleosts. In some species, gills and liver showed slight histopathological changes: telangiectasis, edema and morphological changes related to the presence of parasites...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Fish; Peixe; Environmental quality; Qualidade ambiental; Histology; Histologia.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1002188
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Histopathological evaluation of seven Amazon species of freshwater ornamental armored catfish Biological Sciences
Fujimoto, Rodrigo Yudi; Embrapa Tabuleiros Costeiros; Neves, Mikaelle de Souza; Universidade Federal do Pará; Santos, Rudã Fernandes Brandão; Universidade Estadual Paulista “Júlio de Mesquita Filho”; Cruz, Claudinei da; Universidade Estadual Paulista “Júlio de Mesquita Filho”; Diniz, Daniel Guerreiro; Universidade Federal do Pará; Eiras, Jorge Costa; Universidade do Porto.
Fish commonly known as acaris or plecos are freshwater armored catfish economically important as a food resource and as ornamental fish. Most of these species are captured in the Amazon region. However, despite its economic importance, there is a lack of knowledge about their biological aspects. Thus, this study aimed to characterize and evaluate the histopathological aspects of important organs as gills, liver, integument and kidney of seven species of armored freshwater ornamental catfish fromGuamáRiver,Pará State,Brazil. All organs showed typical characteristics of organs of other teleosts. In some species, gills and liver showed slight histopathological changes: telangiectasis, edema and morphological changes related to the presence of parasites...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish; Environmental quality; Acaris; Histology Histologia Animal.
Ano: 2014 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/22423
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Impact of High Crop Prices on Environmental Quality: A Case of Iowa and the Conservation Reserve Program AgEcon
Secchi, Silvia; Babcock, Bruce A..
Growing demand for corn due to the expansion of ethanol has increased concerns that environmentally sensitive lands retired from agricultural production into the Conservation Reserve Program (CRP) will be cropped again. Iowa produces more ethanol than any other state in the United States, and it also produces the most corn. Thus, an examination of the impacts of higher crop prices on CRP land in Iowa can give insight into what we might expect nationally in the years ahead if crop prices remain high. We construct CRP land supply curves for various corn prices and then estimate the environmental impacts of cropping CRP land through the Environmental Policy Integrated Climate (EPIC) model. EPIC provides edge-of-field estimates of soil erosion, nutrient loss,...
Tipo: Working or Discussion Paper Palavras-chave: Agricultural markets; Conservation Reserve Program; Environmental quality; Crop Production/Industries; Environmental Economics and Policy.
Ano: 2007 URL: http://purl.umn.edu/9373
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Indicadores de qualidade ambiental: para monitorar impacto de tecnologias ambientais. Repositório Alice
PRIMAVESI, O..
2000
Tipo: Resumo em anais de congresso (ALICE) Palavras-chave: Meio ambiente; Qualidade ambiental; Tecnologias ambientais; Environmental control; Environmental quality.
Ano: 2000 URL: http://www.alice.cnptia.embrapa.br/handle/doc/45148
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Intraindustry Trade and the Environment: Is There a Selection Effect? AgEcon
Aralas, Sarma B.; Hoehn, John P..
Replaced with revised version of paper 08/06/10.
Tipo: Conference Paper or Presentation Palavras-chave: Environment; Trade; Monopolistic Competition; Selection effect; Environmental quality; Panel data; OECD; Pollution; Environmental Economics and Policy; International Development; International Relations/Trade; Q56; Q51; Q53; Q58; F12; F18.
Ano: 2010 URL: http://purl.umn.edu/61367
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Microbiological and chemical attributes of a Hapludalf soil with swine manure fertilization PAB
Couto,Rafael da Rosa; Comin,Jucinei José; Soares,Cláudio Roberto Fonsêca Sousa; Belli Filho,Paulo; Benedet,Lucas; Moraes,Marcel Pires de; Brunetto,Gustavo; Beber,Caetano Luiz.
The objective of this work was to evaluate the microbiological and chemical attributes of a soil with a seven‑year history of urea and swine manure application. In the period from October 2008 to October 2009, soil samples were collected in the 0-10 cm layer and were subjected to the treatments: control, without application of urea or manure; and with the application of urea, pig slurry, and deep pig litter in two doses, in order to supply one or two times the recommended N doses for the maize (Zea mays)/black oat (Avena strigosa) crop succession. The carbon of the microbial biomass (MB‑C) and the basal respiration (C‑CO2) were analyzed, and the metabolic (qCO2) and microbial quotient (qmic) were calculated with the obtained data. Organic matter, pH in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Environmental quality; No‑tillage; Pig slurry; Soil quality; Swine production.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2013000700010
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New Regulations Governing Concentrated Animal Feeding Operations Require New Solutions: Discussion AgEcon
Fleming, Ronald A.; Thomas, Michael H..
This paper discusses the three invited papers presented in the session titled “New Regulations Require New Solutions: Federal Provisions Governing Concentrated Animal Feeding Operations” (i.e., CAFOs). These papers provide an excellent review of current state and federal laws and an excellent summary of what has been and is currently being done with respect to CAFO regulation. The papers present three different policy approaches: i) alternative performance standards, ii) location-specific regulation, and iii) insurance-based underwriting of CAFO discharges. Each approach has its drawbacks; however, blending theses suggested policies into current regulations would result in efficiency gains.
Tipo: Journal Article Palavras-chave: Alternative performance standards; Animal Feeding Operations; Confined Animal Feeding Operations; Environmental quality; Insurance; Livestock; Manure management; Market-based incentives; Regulation; Spatial regulation; D81; K32; Q52; Q55; Q58.
Ano: 2004 URL: http://purl.umn.edu/43349
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