title: [Microbial activity in Eastern Venezuelan savannas turned into grasslands].
abstract: We studied the effects of season and management practices on chemical properties and biochemical parameters in a typical Ultisol soil of native and introduced pastures of the Eastern savannas of Venezuela. Sseason, soil management, and their interaction, significantly affected chemical properties and biochemical parameters. The total carbon and the water soluble carbon experienced a significant decrease during the wet period. The basal respiration, the arginine ammonification (AA) and the fluoriscein diacetate hydrolysis showed a relatively low microbial activity. The transformation of native savannas to pastures systems of B. brizantha and S. capitata increased the organic matter content in soil. The AA and the basal respiration were sensible indicators to estimate changes in soil quality and also reflected the interaction of temporal changes and management practices.
authors.affiliation: Universidad de Oriente, Núcleo de Anzoátegui, Laboratorio de Investigaciones Biológicas, Apdo. 1231, Puerto La Cruz, Estado Anzoátegui, Venezuela. irmagomez52@hotmail.com
authors.forename: Y
authors.initials: Y
authors.lastname: Gómez
authors.forename: J
authors.initials: J
authors.lastname: Paolini
mesh_terms: D000383:Agriculture; D001120:Arginine / Q000737:chemistry; D044822:Biodiversity; D002244:Carbon / Q000737:chemistry*; D003247:Conservation of Natural Resources; D017753:Ecosystem; D004784:Environmental Monitoring; D005308:Fertilizers; D050296:Microbial Viability; D000644:Quaternary Ammonium Compounds; D011891:Rain; D012621:Seasons; D012987:Soil / Q000032:analysis*; D012988:Soil Microbiology; D014867:Water
chemical_list: D005308:Fertilizers; D000644:Quaternary Ammonium Compounds; D012987:Soil; D014867:Water; D002244:Carbon; D001120:Arginine