Influence of vegetation in variable climate: study in quarters of Teresina City, Piaui/Influencia da vegetacao em variaveis climaticas: estudo em bairros da cidade de Teresina, Piaui

The process of urbanization has interfered in environmental conditions, promoting the replacement of natural structures for urban equipments. How shocking consequences have arisen the various forms of pollution, creating environmental crises in more differentiated ecosystems. The Thermal comfort is directly linked to environmental conditions such as the temperature and the humidity of the air, which are modified by soil sealing and the absence of vegetation. The study aimed to determine the influence of urban green land in the temperature of Teresina-PI, comparing climate data collected in woodlands with data collected in regions of the city with lower vegetation index, highlighting the importance of these areas for improve the environmental quality of urban space. The research was conducted in city of Teresina, Piaui, focusing on neighborhoods Pedra Mole, Joquei Clube and Dirceu Arcoverde. During the hours of 9, 15 and 21 h, measurements were made of climatic variables in five places with abundant vegetation and arid characteristics, covering the rainy and dry seasons during seven consecutive days. The results showed that the neighborhood with more green areas showed the lowest temperature. In three neighborhoods, higher temperatures were recorded at points devoid of reducing of vegetation, apparel featuring the importance of vegetation in reduction of environment temperature. Key-words: Urban green areas; urbanization; urban climate O processo de urbanizacao tem interferido nas condicoes ambientais, promovendo a substituicao de estruturas naturais por equipamentos urbanos. Como consequencias impactantes tem surgido diversas formas de poluicao, gerando crises ambientais nos mais diferenciados ecossistemas. O conforto termico esta diretamente relacionado as condicoes ambientais, tais como, a temperatura, a umidade do ar e acao dos ventos, que sao modificadas, pela impermeabilizacao do solo e pela ausencia de vegetacao. Neste estudo, o objetivo foi determinar a influencia das areas verdes urbanas na temperatura da cidade de Teresina, Piaui, comparando dados climaticos coletados em locais arborizados, com dados coletados em regioes da cidade com menos vegetacao, destacando a importancia dessas areas para a melhoria da qualidade ambiental do espaco urbano. Desenvolvida em Teresina, a pesquisa enfoca os bairros Joquei Clube, Pedra Mole e Dirceu Arcoverde. Foram realizadas medicoes simultaneas de temperatura e umidade relativa do ar, nos horarios de 9, 15 e 21