Soil Co2 Flux
Mostrando 13-23 de 23 artigos, teses e dissertações.
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13. Fluxo do CO2 proveniente da respiração do solo em áreas de floresta nativa da Amazônia / CO2 flux from soil respiration in areas of native Amazon forest
Carbon dioxide is an important contributor to the greenhouse effect, and by extension, the global climate system as a whole; it is generated and consumed through the activities of terrestrial and aquatic microorganisms. Tropical forest CO2 fluxes at the soil-atmosphere interface depend on changes in the physical, chemical and biological characteristics of th
Publicado em: 2006
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14. CARBON DYNAMICS ON A RHODIC HAPLUDOX ON SOIL TILLAGE AND CROP SYSTEMS / DINÂMICA DO CARBONO EM LATOSSOLO VERMELHO SOB SISTEMAS DE PREPARO DE SOLO E DE CULTURAS
The soil C stock is a consequence of the balance between the C losses by the CO2 emission (associate to the heterotrofic microorganisms activity) and erosion, and to C inputs, associate to organic compounds input by the vegetal photosynthesis process. In order to evaluate the soil tillage and crop systems regarding to the C inputs by the residues and the C l
Publicado em: 2006
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15. Balanço de radiação, energia e fluxo de CO2 em ecossistema de manguezal na Amazônia / Radiation and energy balance and fluxes of CO2 in a Amazon mangrove ecosystem
This work use the longest series of continuous meteorological data and fluxes measurements of CO2, sensible heat and latent heat made in Amazon mangrove ecosystem. The series used in this study corresponds to the period of November, 2002 to August, 2003. The meteorological data were collected using an EDISOL system based on the hedí covariance technique. Th
Publicado em: 2006
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16. GREENHOUSE GASES STUDY IN AMAZONIA / "Estudos de gases de efeito estufa na Amazônia"
The Amazon plays an important role on the global carbon cycle, as changing as carbon storage, since Amazon Basin is the biggest area of tropical forest, around 50% of global. Naturals process, deforestation, and use land are CO2 sources. The Amazon forest is a significant source of N2O by soil process, and CH4 by anaerobic process like flooded areas, rice
Publicado em: 2006
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17. An analysis of surface fluxes and of the microclimate on cerrado, sugarcane and eucalyptus: implications for regional climate changes / Uma análise dos fluxos de superfície e do microclima sobre cerrado, cana-de-açúcar e eucalipto, com implicações para mudanças climáticas regionais
This work investigates potential regional scale temperature and precipitation changes in the São Paulo state, caused by land use changes. We analised micrometeorological measurements, in the period February 2005 to February 2006, over three different ecosystems (cerrado, sugar cane and eucalyptus plantation). The surface energy balances showed that over the
Publicado em: 2006
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18. Functionality and seasonality on Cerrado and ecotone Forest-Cerrado: an inquiry with micrometeorological data of energy and CO2. / Funcionalidade e sazonalidade sobre cerrano e sobre ecótono floresta-cerrado: uma investigação com dados micrometeorológicos de energia e CO2.
This work discusses the energy and CO2 flux variability over a Cerrado Sensu stricto, in São Paulo state, Brazil, and over a seasonally inundated Forest-Cerrado ecotone in Tocantins state, Brazil. Micrometeorological measurements (30 minute average) of weather (temperature, relative humidity, precipitation and wind speed), radiation fluxes (solar radiation,
Publicado em: 2004
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19. Caracteristicas morfo-fisiologicas dofeijoeiro (Phaseolus vulgaris L.) relaci onadas com a resistencia a seca
The study was conducted at the National Pice and Bean Research Center (CNPAF-EMBRAPA) experimental station Goianira GO during the months of May to August in the year 1987 and 1988. The objectives of the experiments conducted were to evaluate drought resistance mechanisms in bean cultivar BAT 477 Carioca; and RAB 96 all promising for planting during dry perio
Publicado em: 1992
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20. Soil microorganisms as controllers of atmospheric trace gases (H2, CO, CH4, OCS, N2O, and NO).
Production and consumption processes in soils contribute to the global cycles of many trace gases (CH4, CO, OCS, H2, N2O, and NO) that are relevant for atmospheric chemistry and climate. Soil microbial processes contribute substantially to the budgets of atmospheric trace gases. The flux of trace gases between soil and atmosphere is usually the result of sim
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21. Fine-root production dominates response of a deciduous forest to atmospheric CO2 enrichment
Fine-root production and turnover are important regulators of the biogeochemical cycles of ecosystems and key components of their response to global change. We present a nearly continuous 6-year record of fine-root production and mortality from minirhizotron analysis of a closed-canopy, deciduous sweetgum forest in a free-air CO2 enrichment experiment. Annua
National Academy of Sciences.
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22. Atmospheric energy for subsurface life on Mars?
The location and density of biologically useful energy sources on Mars will limit the biomass, spatial distribution, and organism size of any biota. Subsurface Martian organisms could be supplied with a large energy flux from the oxidation of photochemically produced atmospheric H2 and CO diffusing into the regolith. However, surface abundance measurements o
The National Academy of Sciences.
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23. Strain IMB-1, a Novel Bacterium for the Removal of Methyl Bromide in Fumigated Agricultural Soils
A facultatively methylotrophic bacterium, strain IMB-1, that has been isolated from agricultural soil grows on methyl bromide (MeBr), methyl iodide, methyl chloride, and methylated amines, as well as on glucose, pyruvate, or acetate. Phylogenetic analysis of its 16S rRNA gene sequence indicates that strain IMB-1 classes in the alpha subgroup of the class Pro
American Society for Microbiology.