Suchergebnisse

The environmental change by the society is recurring and has been intensified since the first civilizations. However, the lack of conservationist practices has caused the emergence of degraded areas, whose recovery is fundamental for the sustainability. In this context, this paper aims at analyzing the environmental recovery as a public policy strategy supported in the Brazilian legislation. As methodology, a documental and analytical research was developed on the regulations, discussed at a multidisciplinary perspective, from the view of legal and engineering specialists, from the agricultural and environmental areas. As a result, it was identified a collection of rules pointing at a significant commitment on the definition of guidelines. On the other hand, this meaningful quantity of legal mechanisms, associated to misalignment, may cause damages to its effectiveness. In conclusion, we can consider that environmental reclamation is widely regulated, and it represents one of the main strategies of the environmental public policy adopted in Brazil. Nevertheless, it still requires advances to combine harmoniously practical and theoretical-conceptual aspects. Thus, considering the moment that Brazil is consolidating a new Forestry Code, we hope that the achieved outcomes can contribute to the debate and mobilization about the environmental reclamation as a strategy for sustainability.

Os remanescentes florestais apresentam uma relevante multifuncionalidade para o fornecimento de serviços ecossistêmicos para as cidades, especialmente relacionados à disponibilidade hídrica em aspectos quantitativos e qualitativos, visto que contribuem para o controle do escoamento superficial e das inundações, redução da poluição filtragem da água, dentre outros. Diante disso, o presente estudo teve como objetivo avaliar a qualidade ambiental dos remanescentes florestais da sub-bacia do rio Capivari, em Campinas-SP, que apresenta alto potencial hídrico, utilizando-se métricas da paisagem. As análises foram realizadas em ArcGIS sobre as seguintes métricas: AREA, CAI, IC, ENN, PROXRIOS, AGUA, BORDA, EROD, aplicadas para o cálculo do Índice de Qualidade Ambiental (IQrem). Identificou-se que 78,0% dos remanescentes apresentam qualidade ambiental média, seguidos por 15,2% com qualidade baixa e apenas 6,8% com qualidade alta. Esta condição está principalmente relacionada à predominância de remanescentes com pouca ou nenhuma área central, associada à formatos predominantemente alongados e a distribuição destes remanescentes em uma malha predominantemente antropizada. Por outro lado, estes remanescentes apresentam considerável conectividade, já que mais de 50% estão próximos a algum remanescente vizinho em até 60 m. Um ponto chave identificado é o fato de que 93,2% dos remanescentes estão em até 60m de algum curso d'água. Desta forma, constatou-se que os remanescentes florestais apresentam uma significativa função para a manutenção da disponibilidade hídrica para o município de Campinas, em termos de qualidade e quantidade. Isto aumenta a importância de que sejam realizadas ações de manejo eficazes que contribuam para aumentar e assegurar a qualidade ambiental destes remanescentes.

Abstract Forest remnants are essential in the provision of ecosystem services in cities. However, adequate ecological parameters are still needed to assess them. Because of this, the present work proposes a methodology for assessing the potential of providing ecosystem services by forest remnants in urban watershed based on the application and interpretation of landscape spatial metrics used in Landscape Ecology studies. For that, the environmental indicators (area, central area, circularity index, distance from the nearest neighbor, water springs, land use, and occupation in the surroundings) were evaluated in GIS software and to them, the Hierarchical Process Analysis Method (AHP) was applied to identify the importance of each parameter in the provision of ecosystem services and the priority in each remainder. The study was carried out in a watershed in Campinas/ SP, in which it was found that forest remnants develop, primarily, ecosystem support or habitat services, regulation services, and cultural services.

The urban environment is often responsible for negative impacts on the climate and environmental comfort, due to the common climatic interference in highly built and waterproofed environments. One of the ways of mitigating negative environmental and microclimate impacts is the use of green areas in the urban environment. Thus, aiming at the analysis of environmental quality parameters of urban regions, it is essential to monitor the influence of green areas on different meteorological variables. In this sense, the use of information acquisition instruments and methodologies can positively contribute to this analysis, which can support decision-making related to urban planning. Thus, this work aims to develop a sensor network with sensor nodes to assess meteorological variables in urban green areas, aiming to analyze and discuss the influence of green areas on the behavior of CO¬2 concentration, temperature and air relative humidity parameters in an urban environment. The proposed and developed sensor nodes enabled the adequate collection of these variables and, based on the results obtained, it was possible to observe that the green area (permanent preservation area -PPA) contributed positively to these variables in the portion of the study area located in Campinas (SP), presenting lower temperature and CO2 concentration and increased air humidity. However, for the portion of Paulínia (SP), it was possible to observe little influence from the PPA. Influences on these variables, exerted by rural areas and parks, were also identified, contributing to the reduction of meteorological parameters, but different interactions were identified with the CO2 concentration, which may present a possible increase or assist in the reduction of CO2 in the air.

A construção de ambientes urbanos pouco sustentáveis, muitas vezes, implica em impactos negativos no clima e no conforto ambiental, devido às interferências climáticas comuns em ambientes altamente construídos e impermeabilizados. Nesse sentido, uma das formas de mitigação dos impactos ambientais e microclimáticos negativos consiste na criação e ampliação de áreas verdes no ambiente urbano. Assim, a análise da influência das áreas verdes no meio ambiente urbano é de fundamental importância para a avaliação de seu impacto no microclima urbano. Essa análise pode ser realizada por meio do monitoramento de variáveis meteorológicas. Nesse sentido, o emprego de instrumentos e metodologias de aquisição de informação podem contribuir positivamente para essa análise, como forma de subsídio para a tomada de decisões relacionada ao planejamento urbano. Nesse contexto, esse trabalho teve como objetivo o desenvolvimento de uma rede de sensores, cujos elementos principais são nós-sensores para avaliação de variáveis meteorológicas em áreas verdes urbanas, visando analisar e discutir a influência de áreas verdes no comportamento dos parâmetros de concentração de CO2, temperatura e umidade relativa do ar. Os nós-sensores propostos e desenvolvidos possibilitaram a coleta adequada dessas variáveis. A partir dos resultados obtidos, foi possível observar que a área verde (área de preservação permanente - APP) contribuiu positivamente com essas variáveis na parcela da área de estudo localizada em Campinas (SP), apresentando menor temperatura e concentração de CO2 e aumento da umidade do ar. Porém, para a parcela de Paulínia (SP), pôde-se observar pouca influência da APP. Foram identificadas, ainda, influências nessas variáveis exercidas por áreas rurais e parques, contribuindo para a redução dos parâmetros meteorológicos, mas com diferentes interações com a concentração de CO2, podendo apresentar possível aumento ou auxiliar na redução de CO2 no ar.

The urban sprawl implies in the reduction of rural production areas and increases the pressure on the natural spaces. Hence, if the urbanization does not occur properly, it can compromise sanitary conditions, biodiversity, resources and environmental services. This paper aims at presenting a mathematical model to support urban sprawl based on population dynamics, applied as a case study in the Economic Hub of the Metropolitan Region of Sorocaba - MRS. The materials corresponded to census data and urban planning parameters of the applicable law. As a result, it was found that the urban extension of Sorocaba is oversized, and that the maintenance of the current conditions and guidelines will have critical consequences, requiring a change in local politics. We conclude that the proposed model can support strategic decisions, preventing problems related to disordered growth.

This study investigated the influence of land use on water quality parameters in the subtropical basin of Jundiaí-Mirim river. Water samples were collected to measure nutrients concentration and direct measurements by multiparameter probe were performed, as well as landscape analysis, using satellite images and visits in the sampling sites, besides analysis of population density data. Data were standardized and the correlation between the variables was measured using Spearman approach. Land use in the surrounding area of the sampling points had strong and significant correlations (p < 0.05) with some of the water quality parameters evaluated. These correlations had different causes, explained by the land use in a 50 m radius, or 500 m radius, or even beyond these environments studied. Landscape analysis has proved to be an important tool for understanding the interaction between water quality and land use.