Water Fluxes
Mostrando 25-36 de 148 artigos, teses e dissertações.
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25. Albedo em cerrado sensu stricto como resposta à variação climática e biológica: conexões com índice de vegetação, estoques de carbono e fluxos de CO2 / Albedo in cerrado sensu stricto as response to climatic and bilogical variation: connections with vegetation index, carbon stocks and fluxes of CO2
In this work we analyze the climatic variability influence over a woodland savannah ecosystem at Gleba Pe de Gigante, Santa Rita do Passa Quatro, SP, during the 2001-2007 period. The data collected for this analysis are from a micrometeorological tower located at Vassununga State Park, which was installed under the thematic project called Biosphere- Atmosphe
Publicado em: 2009
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26. Capacidade de Retenção de Fósforo e Material Particulado em Suspensão por Manguezal de Área Impactada por Efluentes da Carcinicultura. / Phosphorus retention capacity and Suspension of Particulate Matter in Mangrove Area impacted by effluents from Shrimp.
The mangrove forests stabilize the coastal erosion zone and act as a buffering between the continent and the sea. This forest presents high resilient degree, suggested to be used as marker of environmental changes. They play an important role in the energy flow and nutrients cycles. They are suffering with the growth of shrimp ponds. This tends to be respons
Publicado em: 2009
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27. SISTEMA PEDOLÓGICO EM UM AMBIENTE ANTROPIZADO DA DEPRESSÃO CENTRAL DO RS
O presente trabalho foi realizado em uma vertente com sistema pedológico composto de Argissolo/Gleissolo, em área de pastagem, localizada em uma unidade de produção agropecuária, no município de Santa Maria RS. Objetivou-se, a caracterização morfológica e físico-hídrica e a discretização da variabilidade das perdas de solo da vertente. Foram sel
Publicado em: 2009
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28. Fluxos de óxido nitroso na interface ar-mar na Baía de Guanabara
In Surface water concentrations of N2O were measured at 37 stations in Guanabara Bay and fluxes estimated across the air-sea interface. Concentrations averaged 8.2 ± 2.2 nmol L-1 and 90% of the stations showed supersaturation averaging 33%. N2O fluxes were estimated using a two-film model which is given by the product of the concentration difference across
Química Nova. Publicado em: 2008
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29. Dinâmica das formas dissolvidas de nitrogênio e carbono em microbacias da Mata Atlântica no município de Ubatuba (SP) / Dynamics of dissolved forms of nitrogen and carbon in small watersheds of the Atlantic Forest, at Ubatuba - Brazil
Based on the fact that streams water quality reflects the conditions of the landscape, the objectives of this study were: to investigate nitrogen (N), carbon (C) and major ions dynamics in six streams covered by Atlantic Forest; and assess the impacts of the human activities over the biogeochemistry of two urban streams at same region. Since this study is pa
Publicado em: 2008
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30. Estudo da mobilização de metais e elementos traços em ambientes aquáticos do semi-árido brasileiro aplicando análises de componentes principais
The spatial and temporal retention of metals has been studied in water and sediments of the Gavião River, Anagé and Tremedal Reservoirs, located in the semi-arid region, Bahia - Brazil, in order to identify trends in the fluxes of metals from the sediments to the water column. The determination of metals was made by ICP OES and ET AAS. The application of s
Química Nova. Publicado em: 2008
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31. EFEITO DO CLORETO DE SÓDIO NA DIETA, DUREZA E pH DA ÁGUA NA SOBREVIVÊNCIA, CRESCIMENTO E FLUXOS IÔNICOS DE JUVENIS DE JUNDIÁ (Rhamdia quelen) / EFFECT OF DIETARY SODIUM CLORET, WATER HARDNESS AND pH ON SURVIVAL, GROWTH AND IONIC FLUXES OF SILVER CATFISH (Rhamdia quelen) JUVENILES
The purpose of this study was to verify the effect of dietary salt (NaCl) supplementation, water hardness and pH on growth, survival and ionoregulation of silver catfish (Rhamdia quelen) juveniles. In the first experiment, juveniles were fed with diets supplemented with 0.0; 0.5; 1.0 e 2.0 % NaCl and exposed to pH 5.5, 7.0 and 9.0 for 35 days. In the second
Publicado em: 2008
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32. Emissões de CO2, NOx e N2O em solos sob diferentes cultivos na região do cerrado / CO2, NOx and N2O emissions from soils to the atmosphere under differente cropping systems in the cerrado region
The objective of the study was to evaluate the CO2, NO, N2O emissions from Oxisols (Latossolos) under different no-till cropping systems in the Cerrado region (Central Brazil). The results are presented in three chapters. Chapter 1 presents a study on the effects of increasing doses of nitrogen fertilizer on the fluxes of trace gases along the crop cycle of
Publicado em: 2008
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33. QUALIDADE FÍSICO-HÍDRICA DE UM ARGISSOLO SOB FLORESTA E PASTAGEM NO SUL DO BRASIL / PHYSICO-HYDRIC QUALITY OF A HAPLUDALF UNDER FOREST AND PASTURE IN SOUTH BRAZIL
Soil compaction is a problem in different production systems: agriculture, pasture and forest. In the agriculture soil compaction is well documented, while in the pasture and forest its study is scarce. The objective of this study was to evaluate the physical-hydric quality of an Alfisol under forest and pasture in South Brazil, and stabilish parameters and
Publicado em: 2008
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34. EFFECT OF WATER pH AND HARDNESS IN Rhamdia quelen JUVENILES INFECTED WITH Ichthyophthirius multifiliis (Fouquet, 1876) / EFEITO DO pH E DUREZA DA ÁGUA EM JUVENIS DE Rhamdia quelen INFECTADOS COM Ichthyophthirius multifiliis (Fouquet, 1876)
O objetivo deste estudo foi determinar a intensidade da infecção pelo Ichthyophthirius multifiliis, assim como o fluxo líquido de íons (Na+, K+ e Cl-), em juvenis de jundiá expostos a diferentes pHs (5,0; 6,0; 7,0; 8,0 e 9,0 por dezesseis dias), pH (5,0 e 7,0) e dureza (20, 60 e 120 mg CaCO3/L por dezesseis dias) e os parâmetros de estresse oxidativo n
Publicado em: 2008
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35. Study of methane emission on Pantanal of Matogrosso do Sul / Estudo da emissão de metano no Pantanal Sul Matogrossense
The results of an evaluation of the tropical wetland regions contribution to the methane burden are presented. In this study, a total of eight campaigns were performed during the years of 2004 and 2005 inside the Pantanal region of Matogrosso do Sul State in seven sites, near the Miranda River. Static chamber technique with polyurethane syringe sampling was
Publicado em: 2007
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36. Fatores que influem na emissão de CO2 e CH4 em áreas alagáveis interfluviais do médio Rio Negro
Wetlands in the Amazon basin have been shown to be a globally significant source of methane and carbon dioxide, important greenhouse gases. However interfluvial savanna wetlands of Negro River basin have not been characterized. Here we describe the hydrometeorology and their influence on emissions of CO2 and CH4 from these wetlands to improve regional emissi
Publicado em: 2007