Elisa D'angelo - Academia.edu (original) (raw)
Uploads
Papers by Elisa D'angelo
Soil Biology and Biochemistry, 1999
Potential rates of aerobic respiration, denitri®cation, sulfate reduction and methanogenesis were... more Potential rates of aerobic respiration, denitri®cation, sulfate reduction and methanogenesis were investigated in 10 dierent wetland soils with a wide range of biogeochemical characteristics, with the objective of determining relationships between process rates and soil properties. Electron acceptor amendments to methanogenic soils caused gradual (1±13 d) to immediate transitions in electron¯ow from methanogenesis to alternate electron acceptors. Rates of organic C mineralization ranged between 0.2 and 34 mmol C g À 1 d À 1 and averaged three times faster with O 2 as compared to alternate electron acceptors. There was no signi®cant dierence between rates of organic C mineralization (CO 2 + CH 4 production) under denitrifying, sulfatereducing and methanogenic conditions, indicating that soil organic carbon availability was similar under the dierent anaerobic conditions. Rates of electron acceptor consumption ranged between 1 and 107 mmol g À 1 d À 1 for O 2 , 0.5 and 9.3 mmol g À 1 d À 1 for NO 3 À , 0.1 and 11.1 mmol g À 1 d À 1 for SO 4 2À and 0.1 and 6.2 mmol g À 1 d À 1 for CO 2. Heterotrophic potentials in wetland soils were strongly correlated with inorganic N and several available C indices (total, dissolved and microbial C), but not with pH or dissolved nutrients (P, Ca 2+ , Mg 2+ , Fe(II)). Microbial activity±soil property relationships determined in this study may be useful for predicting the fate of pollutants that are in¯uenced by microbial oxidation±reduction reactions in dierent types of wetland soils.
Soil Biology and Biochemistry, 1999
Potential rates of aerobic respiration, denitri®cation, sulfate reduction and methanogenesis were... more Potential rates of aerobic respiration, denitri®cation, sulfate reduction and methanogenesis were investigated in 10 dierent wetland soils with a wide range of biogeochemical characteristics, with the objective of determining relationships between process rates and soil properties. Electron acceptor amendments to methanogenic soils caused gradual (1±13 d) to immediate transitions in electron¯ow from methanogenesis to alternate electron acceptors. Rates of organic C mineralization ranged between 0.2 and 34 mmol C g À 1 d À 1 and averaged three times faster with O 2 as compared to alternate electron acceptors. There was no signi®cant dierence between rates of organic C mineralization (CO 2 + CH 4 production) under denitrifying, sulfatereducing and methanogenic conditions, indicating that soil organic carbon availability was similar under the dierent anaerobic conditions. Rates of electron acceptor consumption ranged between 1 and 107 mmol g À 1 d À 1 for O 2 , 0.5 and 9.3 mmol g À 1 d À 1 for NO 3 À , 0.1 and 11.1 mmol g À 1 d À 1 for SO 4 2À and 0.1 and 6.2 mmol g À 1 d À 1 for CO 2. Heterotrophic potentials in wetland soils were strongly correlated with inorganic N and several available C indices (total, dissolved and microbial C), but not with pH or dissolved nutrients (P, Ca 2+ , Mg 2+ , Fe(II)). Microbial activity±soil property relationships determined in this study may be useful for predicting the fate of pollutants that are in¯uenced by microbial oxidation±reduction reactions in dierent types of wetland soils.