Biodegradation is a complex and multifacited process involving an enormous nmnber and variety of soil organisms. Four groups of microorganisms OCCUR during the decomposition of vegetal residues: cellutolytics, hemicellulolytics pectinolytics and ligninolytics, with exception of the anaerobics and chimiotrophics organisms, these have large energy demands. The study of biodegradation does not require complex methods, but does require long time intervals and is labor intensive . During the decomposition of leaf litther in a "cerrado sensu stricto" area me most frequent filamentous fungi Were: TMchoderma, AbsUBa, f usariam and CyündrodacKum. The addition of organic residue can change the litter decomposition rate.
