Faculdade de Meteorologia - FAMET/IG
URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/2798
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Navegando Faculdade de Meteorologia - FAMET/IG por Afiliação "COSTA, A. C. L. Universidade Federal do Pará"
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Item Acesso aberto (Open Access) Influência de variáveis meteorológicas na produção de liteira na Estação Científica Ferreira Penna, Caxiuanã, Pará(Instituto Nacional de Pesquisas da Amazônia, 2009-09) SILVA, Rosecélia Moreira da; COSTA, José Maria Nogueira da; RUIVO, Maria de Lourdes Pinheiro; COSTA, Antonio Carlos Lôla da; ALMEIDA, Samuel SoaresThe evaluation of the influence on the exclusion of rainfall on the variation of litter production was done in Caxiuanã Forest Reserve at Ferreira Penna Scientific Station (1º 42 ' S, 51º 31 ' W) during the period from March, 2001 to February, 2003 with the objective of identifying the main meteorological variables and the main components of the monthly water balance that affected the production and decomposition of litter. This work was part of the subproject EXPERIMENT OF DROUGHT IN THE FOREST (ESECAFLOR), that aimed to study the long term impacts of drought on the water, energy and carbon dioxide fluxes in the Amazon forest. The sazonality of total litter production and its components (leaves, brushwood and reproductive parts) was well established, with the occurrence of a greater litter production during the months with lower precipitation. The monthly litter production during the experimental period ranged from 294.78 kg.ha-1 to 1758.69 kg.ha-1, with an average of 777.70 kg.ha-1. The total litter production was partitioned in leaves (61.40 %), brushwoods (18.45 %) and reproductive parts (20.14 %). The results obtained in the undisturbed plot showed a higher litter production, about 25 %, compared to the litter production in the plot under the exclusion of water. The variables more strongly correlated with litter production and its components were wind speed, global solar radiation density flux, photosynthetic active radiation density flux, soil temperature at 5 cm depth, precipitation, soil water deficit and water surplus.Item Acesso aberto (Open Access) Precipitação efetiva e interceptação em Caxiuanã, na Amazônia Oriental(Instituto Nacional de Pesquisas da Amazônia, 2008-12) OLIVEIRA, Leidiane Leão de; COSTA, Rafael Ferreira da; SOUSA, Francisco de Assis Salviano de; COSTA, Antonio Carlos Lôla da; BRAGA, Alan PantojaThe present work was carried out at the Ferreira Penna Scientific Station, in the Caxiuanã National Forest, Melgaço, Pará, Brazil (01º 42" 30"S; 51º 31" 45"W; 60 m a.s.l.). The studied region is an upland forest with closed vegetation and a mean canopy height of 35 m although some trees can be 50 m high. The species density is between 450 and 550 plants per hectare. The aim was to quantify the net precipitation, throughfall, stemflow and rain interception by vegetation, from March to December of 2004. For the throughfall measurements 25 rain gauges were randomly distributed in an one hectare area subdivided in one hundred parcels of 10 x 10 m, while the stemflow was measured on seven trees with a stem diameter at breast height representative of the area. The results showed values of net precipitation of 905.4 mm, throughfall of 885.4 mm, stemflow 20 mm and rain interception of 248 mm,corresponding respectively to 78.5%, 76.8%, 1.7% e 21.5% of the total precipitation above the canopy which was 1,153.4 mm for the study period.Item Acesso aberto (Open Access) Variação espacial e temporal da precipitação no estado do Pará(Instituto Nacional de Pesquisas da Amazônia, 2005-06) MORAES, Bergson Cavalcanti de; COSTA, José Maria Nogueira da; COSTA, Antonio Carlos Lôla da; COSTA, Marcos HeilStudies about the climatology of precipitation in the State of Pará are essential for the planning of agricultural activities. The variation of annual and seasonal precipitation in Pará was analysed based on a historic series of 23 years (1976 1998) of daily rainfall data. The analysis was made for 31 locations in Pará, using geographic information systems techniques, with the results presented in maps. The variability of annual and seasonal precipitation was characterized based on the coefficient of variation and the index of relative interanual variability. The variation of these coefficients for the annual precipitation in Pará was 15 to 30 %. The monthly characteristics of the wet season, in terms of beginning, end and duration, were determined using a criteria proposed by KASSAM (1979). The variation between early planting dates and late planting dates were identified by the periods of julian days of 309 319 and 353 363, respectively.