Programa de Pós-Graduação em Ciências Ambientais - PPGCA/IG

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2854

O Programa de Pós-Graduação em Ciências Ambientais (PPGCA) integra o Instituto de Geocências (IG) da Universidade Federal do Pará (UFPA) em parceria com o Museu Paraense Emílio Goeldi (MPEG) e a Empresa Brasileira de Pesquisa Agropecuária (EMBRAPA/Amazônia Oriental) iniciou suas atividades em 2005 com o Mestrado Acadêmico e em 2011 com o Doutorado Acadêmico.

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Acesso aberto (Open Access)
Colonização micorrízica arbuscular em floresta secundária na Amazônia sob remoção de serrapilha e irrigação do solo
(Universidade Federal do Pará, 2010) MAIA, Rodrigo da Silva; VASCONCELOS, Steel Silva; http://lattes.cnpq.br/0719395243841543
We evaluate the effect of alteration of availability of substrate (litterfall) and water about the arbuscular mycorrhizal colonization and chemical attribut of soil in Secondary Forest in the eastern Amazon. The percentagem of mycorrhizal colonization (PMC) was analyzed in apogeotropic roots and roots present in the surface 0-10 cm layer of soil, spore density, glomalin production and physico-chemical attributes of soils in four plots of treatment to litter removal, four plots of irrigation treatment and four control plots. The plots measuring 20 m x 20 m. In each plot was collected four single samples of soil and roots divided into four areas. The results showed that litter removal reduced significantly the PMC in roots, but had no effect on spore density. The litter removal decreased availability of nitrogen and organic carbon in soil, but there was no influence of reduced availability of nutrients in the soil for mycorrhizal colonization. The Glomalin which is produced by hyphae of arbuscular mycorrhizae, and is aggregated with soil organic matter was also reduced by litter removal. The irrigation treatment did not affect the PMC, and spore density in soil and did not affect the availability of nutrients. The study allowed to show that changes in land cover can cause serious damage to the plant-fungus symbiosis.
Acesso aberto (Open Access)
Trocas turbulentas noturnas de CO2 entre a floresta de Uatumã, Amazonas, e a atmosfera
(Universidade Federal do Pará, 2014-07-04) MAFRA, Ana Carolina Batista; SÁ, Leonardo Deane de Abreu; lattes.cnpq.br/0107976161469463; ARAÚJO, Alessandro Carioca de; lattes.cnpq.br/6188087583954899
We study the nocturnal boundary layer - NBL above an area of primary tropical forest northeast of the state of Amazonas, the Sustainable Development Reserve of Uatumã, distant 15 km of the Uatumã River, located about 380 km northeast of the city of Manaus, Amazonas. It is intended to determine some of the characteristics of the NBL, particularly nocturnal turbulence regimes by identifying the differences related to vertical exchanges of CO2, according to the methodology proposed by Sun et al. (2012). Fast response data will be used for the atmospheric scalar and vector quantities, as CO2 concentration and wind speed, respectively. The methodology allows characterization of NBL in three regimes of dynamic stability: 1) weak turbulence, mean low wind speed; 2) strong turbulence, with high wind speed, and 3) intermittent turbulence events with "top -down ". From this characterization, we have investigated some of the main statistical characteristics of each turbulent regime. As would be expected, the turbulent fluxes of CO2 increases with the characteristic scale of turbulent velocity, VTKE, associated with turbulent kinetic energy measured above the forest canopy. The CO2 exchange increases considerably with the regime 2,with higher values of the mean wind speed, | V |, and with the occurrence of strong mixing in the atmospheric boundary layer, ABL, not predominantly generated by surface forcings .

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Navegando Programa de Pós-Graduação em Ciências Ambientais - PPGCA/IG por CNPq "CNPQ::CIENCIAS BIOLOGICAS::BOTANICA::FISIOLOGIA VEGETAL::ECOFISIOLOGIA VEGETAL"