7 resultados para Arborização - Aspetos ambientais
em Repositório Científico da Universidade de Évora - Portugal
Resumo:
As paisagens rurais portuguesas construídas e mantidas ao longo dos tempos por sistemas agrícolas tradicionais, estão hoje ameaçadas por motivos tão diversos como o envelhecimento da população, o abandono rural, a intensificação, a homogeneização dos sistemas de produção e a perda de competitividade. Mas apesar destes problemas, estas paisagens agrícolas, suportam ainda várias funções não produtivas, nomeadamente, constituem, um importante suporte de biodiversidade, pelo que a sua manutenção é importante para a conservação destes habitats e espécies. Eventualmente novas formas de gestão destas paisagens devem ser criadas, nomeadamente com base na combinação de várias funções numa perspectiva de multifuncionalidade, através de uma adaptação e integração de políticas públicas. Estando actualmente em discussão o novo programa de Desenvolvimento Rural e a definição das futuras Medidas Agro-Ambientais, e a gestão e o financiamento da Rede Natura 2000, estamos portanto num momento crítico para decisões futuras, que terão forçosamente que interligar, a agricultura, o ambiente e desenvolvimento das zonas rurais portuguesas. Com o intuito de melhor compreender estas problemáticas, em particular, as transformações em curso na paisagem rural, o papel das Medidas Agro-Ambientais e apresentar possíveis soluções, foi efectuado este estudo de caso no concelho de Marvão, concelho típico das áreas marginais agrícolas do interior sul de Portugal. ABSTRACT; The Portuguese rural landscapes built up and kept throughout the times by traditional agricultural systems, are today threatened by so diverse reasons as the ageing of the population, the agricultural abandonment, the intensification, the homogenization of the production systems and the loss of competitiveness. But despite these problems. These agricultural landscapes still support a multitude of non-commodity functions, and particularly they still constitute an important support of biodiversity and thus their maintenance is important for the conservation of these habitats and species. Probably new management forms must be created based on the combination of various functions and the adaptation and integration of public policies. Being currently in discussion the new program of Rural Development and the definition of the future Agri-Environmental Measures, and the management and the financing of the Natura 2000 Network, we are therefore at a critical moment for future decisions that will forcibly have to establish connections, between the agriculture, the environment and the development of the portuguese agricultural areas. With the intention of better understanding these problems and questions, , the transformations taking place in Portuguese peripheric rural areas, and in particular role of the Agri-Environmental Measures, and also for presenting possible solutions, a case study was analyzed in municipality of Marvão, characteristic of the agricultural marginal areas of the interior Southern Portugal.
Resumo:
A produção e qualidade do leite são influenciadas por factores ambientais como a nutrição, factores genéticos como a raça, e factores fisiológicos como a idade a idade ao parto ou o número de ordenhas diárias. Este trabalho teve por objectivo estimar factores de correcção para os efeitos ambientais que influenciam a quantidade e qualidade do leite com vista ao melhoramento genético dos animais. Para isso, foram utilizados os registos de 23897 contrastes leiteiros de vacas de raça Frísia, no período de 6 anos, recolhidos a partir dos dados da ANABLE. De acordo com os resultados, obtidos através do método dos quadrados mínimos, observa-se que para a produção de leite, gordura e proteína, todos os efeitos fixos de variação são significativos nas três características produtivas estudadas, pelo que se conclui que há interacção entre a idade da vaca ao parto e a produção e qualidade do leite, assim como, a época do ano em que ocorre o parto e o número de ordenhas diárias a que o animal está sujeito. ABSTRACT; Cow production and milk quality are influenced by environmental factors such as nutrition, by genetic factors as breed and physiological factors as age at calving or milking frequency. This study aimed to estimate correction parameters for environmental factors with influence on milk production and quality embodying genetic improvement. For this propose, a data base was used with information related to 23987 milk tests collected from official milk recording program. According to the results, where the at least square procedure was adopted, it shows that all the fixed effects of variation significantly affect the productive performances, so it can be concluded that there is a significant interaction between milking frequency, age at calving and season when it occurs, and milk production and quality.
Resumo:
In this chapter, the authors made a survey of the research undertaken by social scientists and their reflections on environmental conflicts in Portugal. In these, a critical discourse has emerged concerning, on the one hand, the weak public environmental awareness, and, on the other, the progressive obliteration of environmental movements and their institutionalization throughout the creation of different environmental groups and the incorporation of the “environment” in legislation and in political discourse. In a brief retrospective, we review several conflicts taking into account different relevant factors: level of mobilization, media attention received, organization, impact, and ideological reference they have had in Portugal since the seventies. We have particularly highlighted the movement against nuclear energy and the construction of dams, the pollution caused by intensive breeding, the expansion of eucalyptus plantations, the conflicts against “wild” forms of mining, the business of toxic waste, the expansion of the economy of the concrete, the installation of landfills, and the defense of the natural heritage. This survey has considered three periods: the 1970s, marked by the emergence and performance of ecological movements of different ideological extraction; the second half of the 1980s, marked by the institutionalization of the environment and the imposition of a new legal framework with impact on environmental policies resulting from the integration into the European Economic Community; and finally, a third period, from the 1990s to present, marked by increasing environmental media coverage, with a particular emphasis on environmental conflicts in a context of an increasing liberalization of economic activities and the expansion of extraction and of the concrete economy. This is also the period where the environment emerges in disputes over the uses of the territory as economic and asset value. Most of these conflicts arise from the activities of local agents or national environmental groups that quickly gain strong local roots and sometimes even have some success. However, their impact on the national and Community legislation seems to be less relevant.
Resumo:
This chapter explores the relationship between environmental conflicts and technical progress, trying to understand, in the case of large mines of the Iberian Pyrite Belt, in Alentejo, how emerging environmental problems conditioned the performance or led to the search for alternative technical solutions, taking as chronological limit for this observation the beginning of World War II. In the absence of the archives of the companies, the research was based on existing administrative documents in the state archives (mining engineers reports, the licensing of mining activities), on reports and documents published in specialized mining press, in particular, the Bulletin of the Ministry of Public Works, Trade and Industry, the Journal of Public Works, Trade and Industry (both in Portuguese), and finally in the local press. Despite that limitation, the information available shows that in global competition markets, the success of the British enterprise in Santo Domingo had the active search for new technical solutions for the creation and adaptation of existing knowledge to local problems in order to maximize the mineral resources available. The early development of the hydrometallurgical processes for the treatment of poor ores, named ‘natural cementation’, can be explained as the way these companies tried to solve problems of competitiveness, boosting economies of scale. Thus, they transferred the environmental costs previously limited to agriculture to more fragile social groups, the poor fishermen of Guadiana River and of Vila Real de Santo António. Therefore, the hydrometallurgy of pyrites was developed locally, pioneered in Santo Domingo that allowed the survival and expansion of the British company from the late 1870s, that is, at a time when most small mines shut since they were not able to compete globally. Through different consented and regulated processes (judicial), through conflict or parliamentary mediation, the State imposed exceptionally additional costs to companies, either for compensation, the imposing the application of remediation measures to reduce the environmental damage in some cases, thus contributing to derail some projects. These cases suggest that the interaction between local conflicts, corporate behavior and technological progress proves to be complex. This article aims to contribute to the debate on economic and social history between the environment and technological progress, arguing that the fixed costs and economic imponderable social risks were factors that encouraged the companies to search for new solutions and to introduce innovations since that would allow the expansion of their activity. In this process the companies sometimes faced environmental dilemmas and unforeseen costs with consequences on the economy of firms. The nature of the knowledge needed to address the environmental problems they created, however, is of a very different nature from that knowledge needed to face the environmental burdens that were inherent to the development of its activity.
Resumo:
This chapter reflects on several forthcoming key topics on environmental social conflits in historical perspective, namely, the relationship between the expansion of extractivism and the reactive and preemptive conflicts, the role of scientists and scientific discourses on social mobilization, the environmental movements and the empowerment of the poor, the strategic response behavior of large mining corporations. The conclusive analysis looks for continuities and contrasts between contemporary environmental conflicts and the conflicts of the past, often identified as 'peasant conflicts' over industrial polution.
Resumo:
O aumento da pressão sobre os recursos hídricos tem levado muitos países a reconsiderarem os mecanismos utilizados na indução do uso eficiente da água, especialmente na agricultura irrigada. Estabelecer o preço correto da água é um dos mecanismos de tornar mais eficiente a alocação da água. O presente trabalho tem como objetivo a análise dos impactes económicos, sociais e ambientais de políticas de preço da água. A metodologia utilizada foi a Programação Linear, aplicada ao Perímetro Irrigado do Vale de Caxito, Província do Bengo, a 45 km de Luanda, que tem como fonte o rio Dande. Foram testados três cenários relativos a políticas de tarifação de água: tarifa volumétrica simples, tarifa volumétrica variável, e tarifa fixa por superfície. As principais conclusões mostram que, do ponto de vista do uso eficiente da água na agricultura, os melhores resultados obtêm-se com a tarifa volumétrica variável; do ponto de vista social, a tarifação volumétrica simples apresenta os melhores resultados; o método de tarifa volumétrica variável foi o mais penalizador, reduzindo rapidamente a área das culturas mais consumidoras de água, sendo o melhor do ponto de vista ambiental. Qualquer um dos métodos traz aspetos negativos relativamente à redução da margem bruta total. Palavras-chaves: Recursos hídricos; Preço da água; Programação linear. Abstract: Increased pressure on water resources has led many countries to reconsider the mechanisms used in the induction of efficient water use, especially for irrigated agriculture, a major consumer of water. Establishing the correct price of water is one of the mechanisms for more efficient allocation of water. This paper aims to analyze the economic, social and essenenvironmental impacts of water price policies. The methodology used is the linear programming, applied to the Irrigated Valley Caxito, in Bengo Province, 45 kilometers from Luanda, which has the river Dande as its source. Three scenarios concerning water price policies were tested: simple volumetric rate, variable volumetric rate and flat rate per surface. The main findings show that from the point of view of the efficient use of water in agriculture, the best results are obtained with variable volumetric rate; from the social point of view, the simple volumetric rate has the best results; the volume variable rate method proved to be the most penalizing, quickly reducing the area of most water consuming cultures, being the method in which the environmental objectives would be more readily achieved. Either methods bring negative aspects in relation to the reduction of total gross margin. Key-words: Water resources; Water price; Linear programming.
Resumo:
Resumo: A psicomotricidade tem como objeto de estudo o corpo e as suas relações com o exterior. Inserido num determinado contexto ambiental, o corpo é um dos veículos centrais na transmissão de mensagens. O conhecimento do psicomotricista, acerca da utilização e identificação dos aspetos não-verbais, é determinante para melhorar a qualidade da intervenção, especialmente quando estamos perante a psicomotricidade com enfâse na qualidade da relação. Neste trabalho temos como objetivo conhecer a ocorrência não-verbal, toque e sua tipologia, a partir de Watson (1975), operada nos braços de uma criança, com paralisia cerebral (hemiparesia direita), pelo psicomotricista durante a sua intervenção. Esta análise consiste num estudo de caso realizado através da visualização sistemática e sistematizada de um vídeo durante uma sessão, na qual o psicomotricista interage com a criança com fins terapêuticos. A recolha de dados foi feita por vídeo-gravação e transcritos, verbalmente, para o papel e analisados e categorizados, posteriormente. Os resultados obtidos levaram-nos a concluir que o psicomotricista utilizou todos os aspetos não-verbais relacionados com o toque nos braços. A maioria destes toques foi do tipo Instrumental/Afetivo. Emergiram dados os quais se revelaram pertinentes como contributos para a melhoria da qualidade da intervenção, quando conhecidos e utilizados, adaptadamente, pelo psicomotricista.Abstract: The object of psychomotricity is the study of the body and its relationships with the outside world. Within a certain environmental context, the body is one of the central vehicles in the transmission of messages. The psychomotricity therapist's knowledge about the use and identification of non-verbal aspects is the key to improve the efficiency of the intervention, especially when we face psychomotricity with emphasis on the quality of the relationship . The aim of this work is to reckon the non-verbal happening of touch and its typology, according to Watson(1975), operated by the psychomotricist on the arms of a child with cerebral palsy,(right hemiparesis) during his/her intervention. This analysis consists of a case study based on the systematic and systematized viewing of a video made during one session, in which the therapist interacts with the child for therapeutic purposes. The collection of data was made through vídeo recording and verbally set down transcrptions for later analysis and categorization. The results obtained let us conclude that the psychomotricity therapist used all the non-verbal aspects related to arm touching . Most of these touches were of the instrumental/affective kind. Data have emerged that were considered relevant as contributing to improve the quality of the intervention if they are known and aproppriately used by the psychomotricity therapist.