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| Registros recuperados: 311 | |
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| Marques,Jean Dalmo de Oliveira; Luizão,Flávio Jesus; Teixeira,Wenceslau Geraldes; Sarrazin,Max; Ferreira,Sávio José Filgueira; Beldini,Troy Patrick; Marques,Elizalane Moura de Araújo. |
| Organic matter plays an important role in many soil properties, and for that reason it is necessary to identify management systems which maintain or increase its concentrations. The aim of the present study was to determine the quality and quantity of organic C in different compartments of the soil fraction in different Amazonian ecosystems. The soil organic matter (FSOM) was fractionated and soil C stocks were estimated in primary forest (PF), pasture (P), secondary succession (SS) and an agroforestry system (AFS). Samples were collected at the depths 0-5, 5-10, 10-20, 20-40, 40-60, 60-80, 80-100, 100-160, and 160-200 cm. Densimetric and particle size analysis methods were used for FSOM, obtaining the following fractions: FLF (free light fraction), IALF... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fractionation; Soil organic matter; Land use; Soil physical fractions. |
| Ano: 2015 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832015000100232 |
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| Jansson, Torbjorn; Bakker, Martha M.; Le Mouel, P.; Schirmann-Duclos, D.; Verhoog, A. David; Verkerk, P.J.. |
| In this paper we investigate the impacts of abolishing the Common Agricultural Policy (CAP) for the post-2013 European Union (EU) financial perspective and the impacts of re-investing the released funds on research and development (R&D). We apply a linked system of models to analyze the impacts for the EU member states. The linked system consists of five land-use sector models (agriculture, forestry, urban area, tourism and transport infrastructure), which are connected to a macro-econometric model. Additionally, a land cover model is used to disaggregate land use countries to a 1 km² grid. Three scenarios are analysed. In the “baseline” currently decided policies are assumed to be continued until 2025. In the “tax rebate” scenario agricultural support... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: CAP reform; Economical growth; Land use; Agricultural and Food Policy; Land Economics/Use. |
| Ano: 2008 |
URL: http://purl.umn.edu/43640 |
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| Liu, Fei-yue; Wang, Shao-kai. |
| According to the ecological safety evaluation index data of land-use change in Ji’an City from 1999 to 2008, positive treatment on selected reverse indices is conducted by Reciprocal Method. Meanwhile, Index Method is used to standardize the selected indices, and Principal Component Analysis is applied by using year as a unit. FB is obtained, which is related with the ecological safety of land-use change from 1999 to 2008. According to the scientific, integrative, hierarchical, practical and dynamic principles, ecological safety evaluation index system of land-use change in Ji’an City is established. Principal Component Analysis and evaluation model are used to calculate four parameters, including the natural resources safety index of the land use, the... |
| Tipo: Journal Article |
Palavras-chave: Land use; Ecological safety; Principal Component Analysis; Evaluation; China; Agribusiness. |
| Ano: 2010 |
URL: http://purl.umn.edu/93546 |
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| Crivelenti,Rafael C.; Bueno,Célia R. P.; Pires,José S. R.; Francisco,José; Lessi,Bruno F.. |
| ABSTRACT: Since colonial times, Brazilian land use has been made under an extractivist model at the expense of deforestation, increasing soil and vegetation depletion, stream siltation, as well as loss of biodiversity. An ecological-economic zoning (EEZ) has been taken as feasible alternative to guide public policies aimed at city land-use planning. This study focused on designing an EZZ for the city of Altinópolis, in São Paulo state (Brazil), by means of geographical information systems (GIS). Information and maps delineated six land-use areas, in which 30% covered areas under environmental protection, 45% over areas with groundwater recharge potential, which should be intended to restoration. Furthermore, around 70% of the territory show potential to be... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Geographical information systems; Soil and water preservation; Environmental planning; Land use. |
| Ano: 2016 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69162016000601218 |
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| Hyytiainen, Kari; Leppanen, J.; Pahkasalo, T.. |
| Rational land use decisions of private landowners are analysed in the framework of Common Agricultural Policy and other public support schemes effective in Finland in 2003. Net present values are computed for a marginal hectare of a typical Finnish farm. Three alternative land uses are considered: traditional cultivation of oats (Avena sativa L.), cultivation of reed canary grass (Phalaris Arundinacea L.) for energy production, and production of Norway spruce (Picea abies [L.] Karst.) timber. Both arable land and forested land are considered as initial states. Experimental data from 38 afforested stands and distance-independent individual-tree stand growth model are used for computing discounted net returns from forestry. Statistics on market prices,... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Common Agricultural Policy; Energy grass; Incentives; Land use; Resource /Energy Economics and Policy. |
| Ano: 2008 |
URL: http://purl.umn.edu/44178 |
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| AMARAL, E. F. do; BROWN, I. F.; MELO, A. W. F. de. |
| O uso da terra na Amazônia está condicionado ao processo de fragmentação florestal. No Acre, o arco do desmatamento é constituído pela BR-364 e BR-317. Este trabalho tem como objetivo avaliar os efeitos do uso da terra nas características químicas e físicas do solo, em uma cronosseqüência de uso em uma área de grande fazendeiro no sudeste acreano. Foi conduzido na fazenda Ponteio, situada às margens da BR-317, no município de Capixaba, sendo georreferenciadas três unidades amostrais, caracterizando o gradiente de pressão antrópica: pasto, capoeira e floresta. Em cada unidade amostral foram retiradas informações sobre o histórico de uso e coletados dados referentes às seguintes características: densidade aparente, resistência do solo até 60 cm... |
| Tipo: Séries anteriores (INFOTECA-E) |
Palavras-chave: Fragmentação florestal; Arco do Desmatamento; Rodovia BR-364; Rodovia BR-317; Fazenda Ponteio; Capixapa (AC); Acre; Amazônia Ocidental; Western Amazon; Amazonia Occidental; Propiedades químicas del suelo; Uso de la tierra.; Fragmentación de hábitats; Propiedades fìsicas del suelo; Uso da terra; Solo; Propriedade Físico-Química; Land use; Habitat fragmentation; Soil chemical properties; Soil physical properties.. |
| Ano: 2001 |
URL: http://www.infoteca.cnptia.embrapa.br/infoteca/handle/doc/495274 |
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| Morgado,Luiz Balbino; Willey,Robert William. |
| Nitrogen supply and plant population are basic parameters for cereal-legume intercropping. In order to study plant population and nitrogen fertilizer effects on yield and yield efficiency of maize-bean intercropping, a field experiment was established. Three bean plant populations and three nitrogen levels were used. Maize dry matter accumulation decreased with increases in bean plant population. Competitive effect of intercrop beans on maize yields was high at higher plant populations, being decreased by nitrogen fertilizer; application of 50 kg ha-1 N was very efficient in increasing maize cob yield. Intercropping significantly decreased harvest index of beans in all plant population and nitrogen fertilizer situations. The efficiency of intercropping,... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Zea mays; Phaseolus vulgaris; Mixed cropping; Land use. |
| Ano: 2003 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003001100002 |
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| Lubowski, Ruben N.; Bucholtz, Shawn; Claassen, Roger; Roberts, Michael J.; Cooper, Joseph C.; Gueorguieva, Anna; Johansson, Robert C.. |
| This report examines evidence on the relationship between agricultural land-use changes, soil productivity, and indicators of environmental sensitivity. If cropland that shifts in and out of production is less productive and more environmentally sensitive than other cropland, policy-induced changes in land use could have production effects that are smaller-and environmental impacts that are greater-than anticipated. To illustrate this possibility, this report examines environmental outcomes stemming from landuse conversion caused by two agricultural programs that others have identified as potentially having important influences on land use and environmental quality: Federal crop insurance subsidies and the Conservation Reserve Program (CRP), the Nation's... |
| Tipo: Report |
Palavras-chave: Conservation Reserve Program (CRP); Crop insurance; Erosion; Extensive margin; Farm policy; Imperiled species; Land use; Land-use change; Land quality; Nutrient loss; Soil productivity; Environmental Economics and Policy; Land Economics/Use. |
| Ano: 2006 |
URL: http://purl.umn.edu/33591 |
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| López Paniagua, Cristopher. |
| Se realizó un estudio de mercado de los servicios ambientales hidrológicos (SAH) en la cuenca de Tapalpa, Jalisco, México, cuya superficie es de 21,000 ha, donde el 44% es de uso forestal. Para determinar la oferta hidrológica se utilizó el modelo hidrológico SWAT (soil and water assesment tool, herramienta de valoración de suelo y agua) que presentó un buen ajuste (R2 = 0.85) al ser calibrado con la producción de agua en una de las cinco subcuencas que integran el área de estudio. El análisis de demanda indica que existe un superávit del recurso hídrico (19,792,015 m3/año), ya que solamente se aprovecha el 54% (23,171,885 m3/ha) de la oferta total (42,963,900 m3/ha). De ésta, el 93% seutiliza en el sector agrícola, principalmente en la producción de... |
| Tipo: Tesis |
Palavras-chave: Disponibilidad a pagar; Servicios ambientales; Costo de oportunidad; Uso del suelo; Oferta de agua; Maestría; Forestal; Willingness to paid; Environmental services; Opportunity cost; Land use; Supply of water. |
| Ano: 2007 |
URL: http://hdl.handle.net/10521/1606 |
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| Rodrigues, Neyrianne d´Angelis; Batista, Getulio Teixeira; Targa, Marcelo dos Santos. |
| O presente trabalho objetivou avaliar o escoamento superficial da área que engloba os afluentes do Ribeirão Serragem no município de Tremembé, SP no vale do Paraíba do Sul, localizada na parte a montante da barragem da Fazenda Maristela, bem como mapear o uso do solo da mesma para subsidiar possíveis intervenções visando o uso sustentável dessa bacia. Foram empregadas técnicas de geoprocessamento com o uso de ferramentas do SPRING para a caracterização do uso e ocupação do solo, da caracterização física da bacia e para o cálculo da precipitação efetiva. Os resultados indicaram que a bacia do Ribeirão Serragem apresenta um bom estado de conservação, levando em consideração que ocorre o predomínio de florestas em todas as classes de APP com maior predomínio... |
| Tipo: Article |
Palavras-chave: Basin; Flow; Land use; Environmental science. |
| Ano: 2012 |
URL: http://hdl.handle.net/2315/242 |
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| Uchida, Shinsuke. |
| Among multiple slippage effects potentially generated in voluntary land retirement programs, this study attempts to identify one unique source of slippage. Specifically, I examine slippage caused by within-a-farm land conversion from uncultivated land to cropland. With the U.S. Agricultural Census farm-level longitudinal data on land use and enrollment in the Conservation Reserve Program (CRP), I find that an average partial-farm CRP participant converts 25% of noncropland to cropping activities as a consequence of CRP enrollment. Also, an estimated slippage rate varies across farm types and regions. In particular, farms with relatively inelastic crop acreage supply lead to more slippage. Knowledge about the mechanisms through which slippage occurs should... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Conservation Reserve Program; Land use; Land conservation; Slippage.; Agricultural and Food Policy; Land Economics/Use; Q15; Q18; Q24; Q58.. |
| Ano: 2011 |
URL: http://purl.umn.edu/103612 |
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| Registros recuperados: 311 | |
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