Salt Marsh Soils
Mostrando 1-10 de 10 artigos, teses e dissertações.
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1. Characterization of the humic substances extracted from the soil of the Pai Matos mangrove forest (Cananéia, SP, BR) and Spanish salt marshes (Galicia and Valencia) / Caracterização das substâncias húmicas extraídas do solo do manguezal de Pai Matos (Cananéia, SP, BR) e de marismas da Espanha (Galícia e Valência)
Os objetivos deste estudo foram: 1) avaliar por meio da análise elementar (C, N, H, S, O), Ressonância Paramagnética Eletrônica (RPE), e Espectroscopia de Infravermelho com Transformada de Fourier (FTIR) às características dos ácidos húmicos (AHs) extraídos do solo do manguezal de Pai Matos (Cananéia-SP-BR) sob diferentes tipos de vegetação (Rhiz
Publicado em: 2008
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2. Arylsulfatase Activity in Salt Marsh Soils †
The presence of arylsulfatase(s) was confirmed in salt marsh soils. The temperatures of maximum activity and inactivation, the pH range over which the enzyme was active, and the Km values were similar to those of soil enzymes. Unlike soil arylsulfatases, however, the salt marsh enzymes do not appear to be repressed by sulfate. It is postulated that these enz
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3. Microbial degradation of hydrochlorofluorocarbons (CHCl2F and CHCl2CF3) in soils and sediments.
The ability of microorganisms to degrade trace levels of the hydrochlorofluorocarbons HCFC-21 and HCFC-123 was investigated. Methanotroph-linked oxidation of HCFC-21 was observed in aerobic soils, and anaerobic degradation of HCFC-21 occurred in freshwater and salt marsh sediments. Microbial degradation of HCFC-123 was observed in anoxic freshwater and salt
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4. Role of the Salt Marsh Grass Spartina alterniflora in the Response of Soil-Denitrifying Bacteria to Glucose Enrichment †
Long-term incubations of salt marsh soil systems in the presence of glucose resulted in a decrease in the soils' denitrification potential. Addition of nitrate or the presence of living Spartina alterniflora reversed this effect, indicating that Spartina, through the establishment of an oxidized rhizosphere where nitrification can occur, enables the denitrif
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5. Effect of the Spartina alterniflora Root-Rhizome System on Salt Marsh Soil Denitrifying Bacteria †
Nitrous oxide (N2O) reductase activity was used as an index of the denitrification potential in salt marsh soils. In a short Spartina alterniflora marsh, the seasonal distribution of N2O reductase activity indicated a causal relationship between S. alterniflora root-rhizome production and the denitrification potential of the soil system. The relationship was
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6. Comparison of Nitrogen Fixation Activity in Tall and Short Spartina alterniflora Salt Marsh Soils 1
A comparison of the N2 fixers in the tall Spartina alterniflora and short S. alterniflora marsh soils was investigated. Zero-order kinetics and first-order kinetics of acetylene reduction were used to describe the activity of the N2 fixers in marsh soil slurries. It was found that the Vmax values were approximately 10 times greater for the N2 fixers in the t
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7. Tracer Analysis of Methanogenesis in Salt Marsh Soils †
Differences in paths of carbon flow have been found in soils of the tall (TS) and short (SS) Spartina alterniflora marshes of Sapelo Island, Ga. Gaseous end products of [U-14C]glucose metabolism were 14CO2 and 14CH4 in the SS region and primarily 14CO2 in the TS region. Sulfate concentration did not demonstrably affect glucose catabolism or the distribution
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8. Stimulation of Methanogenesis by Aldicarb and Several Other N-Methyl Carbamate Pesticides †
Aldicarb and several other N-methyl carbamate pesticides stimulated methane production in anaerobic salt marsh soils and organic-rich aquifer soils. Stimulation was biological and linearly related to the amount of carbamate added. Of the four carbamates studied, methomyl gave the greatest stimulation followed by carbaryl, aldicarb, and baygon. The percent co
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9. A New Klebsiella planticola Strain (Cd-1) Grows Anaerobically at High Cadmium Concentrations and Precipitates Cadmium Sulfide
Heavy metal resistance by bacteria is a topic of much importance to the bioremediation of contaminated soils and sediments. We report here the isolation of a highly cadmium-resistant Klebsiella planticola strain, Cd-1, from reducing salt marsh sediments. The strain grows in up to 15 mM CdCl2 under a wide range of NaCl concentrations and at acidic or neutral
American Society for Microbiology.
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10. Effects of Acid Stress on Aerobic Decomposition of Algal and Aquatic Macrophyte Detritus: Direct Comparison in a Radiocarbon Assay
Radiolabeled phytoplankton and macrophyte lignocelluloses were incubated at pHs 4 and 7 in water from a naturally acidic freshwater wetland (Okefenokee Swamp; ambient pH, 3.8 to 4.2), a freshwater reservoir (L-Lake; pH 6.7 to 7.2), and a marine marsh (Sapelo Island; pH ∼7.8). The data suggest that acidity is an important factor in explaining the lower deco