Hernani José Brazão Rodrigues

Variabilidade sazonal da condutância estomática em um ecossistema de manguezal amazônico e suas relações com variáveis meteorológicas

) para o periodo chuvoso (marco) e seco (agosto) do ano de 2003, e suas relacoes de dependencia com algumas variaveis meteorologicas medidas em um ecossistema de manguezal amazonico. As informacoes utilizadas foram do projeto ECOBIOMA, parte integrante do Experimento de Grande Escala da Biosfera-Atmosfera da Amazonia (LBA). A g

Thermo- hygrometric variations and study of urban heat island in the city of Bragança -PA and surrounding region

Revista Brasileira de Geografia Física, vol. 9, n. 02, (2016) 571-584. 572 Costa e Costa, A., Rodrigues, H. J. B., Costa, J. L. O., Souza, P. F. de S., Silva Junior, J. A., Costa, A. C. L. night, thus causing certain human discomfort. With that, the microclimate changes in the city of Bragança-PA, as well as other urban centers in general are caused by human activities that interfere with peoples quality of life. This work is important for publication in the magazine due to their scientific contribution to society

VARIAÇÃO SAZONAL DA POPULAÇÃO DE BACTÉRIAS E FUNGOS E DOS TEORES DE NITRATO E AMÔNIO DO SOLO NOS SÍTIOS DO LBA E PPBIO, NA AMAZÔNIA ORIENTAL

E possivel que os fatores ambientais, que determinam o comportamento da microbiota edafica, estejam sendo modificados pelas mudancas climaticas de origem natural e/ou antropica. A fim de verificar o efeito da exclusao de agua sobre a populacao de bacterias e fungos do solo, foi desenvolvido o presente estudo na area do experimento ESECAFLOR, que simula a ocorrencia de fenomenos extremos, como o evento El Nino, e na area do Programa de Pesquisa em Biodiversidade - PPBio (Floresta Primaria), que visa estudar a Biodiversidade da Amazonia, sendo esta usada como controle para fins comparativos. As amostras de solo foram coletadas nas profundidades: 0-5, 5-10, 10-20 e 20-30 cm, nos periodos sazonais chuvoso, de transicao e menos chuvoso. Os maiores valores de Unidades Formadoras de Colonias (UFC) para as populacoes de Bacterias e Fungos foram 196 x 104 UFC/g de solo e 124 x 102 UFC/g de solo, respectivamente, ambos na area sem intervencao antropica (PPBio). A umidade do solo e a variavel que teve maior influencia nos valores nas contagens obtidas das populacoes de fungos e bacterias.

ANÁLISE E ESTIMATIVA DOS COMPONENTES DO BALANÇO DE ENERGIA EM ECOSSISTEMA DE MANGUEZAL AMAZÔNICO.

Measurements and estimates of the components of energy balance were made above the canopy of trees in natural mangrove ecosystem, located 30 km from the city of Braganca-PA, between November 2002 and August 2003. The data were used in the analysis of seasonal and hourly variations of the sensible and latent heat flows, as well as the evaluation of the energy partition. Meteorological data were collected by the automatic weather station (AWS) and the energy flows were calculated using the technique of eddy covariance. The Penman-Monteith and Shuttleworth models were used to estimate the sensible and latent heat flow. The objective of this study was to analyze the balance and partitioning of energy in the mangrove and make an assessment of the behavior of empirical models in estimating the energy flows. The net radiation showed higher values ​​in the less rainy season. The Bowen ratio showed generally low value, which indicates that a greater proportion of energy was used in the form of latent heat. The estimates of the energy flows showed satisfactory results. Shuttleworth model is more efficient in estimating sensitive heat flows. For estimating latent heat flow the Penman-Monteith model was more efficient during dry season and the Shuttleworth model during rainy season.

Análise da variação do nível de fração evaporativa na Floresta Nacional de Caxiuanã

We use meteorological data measured from march 2005 todecember 2008 at a tower breilt in Caxiuana Reserve from Para, toinvestigate evaporative demand variability in a forest tropical environment.The results show that for the year of 2005, when a great drought happenedin Western Amazon, at Caxiuana Reserve the evaporative demand hasbeen greater than its mean value during the wet season and has beenlower than its mean value during the dry season, during extreme eventoccurrence.