title: Earthworms strongly modify microbial biomass and activity triggering enzymatic activities during vermicomposting independently of the application rates of pig slurry.
abstract: We studied the relationships between earthworm activity, microbial biomass and the activation and dynamics of several enzyme activities. We carried out an experiment in which low and high rates (1.5 and 3 kg respectively) of pig slurry were applied to small scale reactors with and without earthworms. We found that extracellular enzyme activity increased with rate of pig slurry. In both rates of pig slurry applied, the presence of earthworms in young layers stimulated microbial growth which decreased once earthworms left the slurry and the layers aged. This increase was related to the initial activation of the microbial enzymes studied as correlations between microbial biomass and enzymes showed, which indicated an increase of intracellular enzyme activity. In the aged slurry, the pattern of activity of the four enzymes assayed depended on the rate of pig slurry applied. Thus, in low rate reactors, enzymatic activity through layers appeared to be related to microbial biomass, but in high rate reactors the activity of enzymes was more or less continuous. Further, these differences in overall enzyme activity agree with the variation found in extracellular enzyme activity suggesting certain dependence on substrate availability.
authors.affiliation: Departamento de Ecoloxia e Bioloxía Animal, Facultade de Ciencias, Universidad de Vigo, Vigo E-36200, Spain. aira@uvigo.es
authors.forename: Manuel
authors.initials: M
authors.lastname: Aira
authors.forename: Fernando
authors.initials: F
authors.lastname: Monroy
authors.forename: Jorge
authors.initials: J
authors.lastname: Domínguez
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000818:Animals; D018533:Biomass; D002480:Cellulase / Q000378:metabolism; D006867:Hydrolases / Q000378:metabolism*; D008372:Manure / Q000382:microbiology*; D009835:Oligochaeta; D010447:Peptide Hydrolases / Q000378:metabolism; D012988:Soil Microbiology; D013552:Swine; D001617:beta-Glucosidase / Q000378:metabolism
chemical_list: D008372:Manure; D006867:Hydrolases; D000469:Alkaline Phosphatase; D001617:beta-Glucosidase; D002480:Cellulase; D010447:Peptide Hydrolases