Resumo

CASTRO P., Jorge H.; BURBANO O., Hernán  e  BONILLA C., Carmen R.. Abundance and biomass of soil organisms in three land use systems in the high plateau of Pasto, Colombia. Acta Agron. [online]. 2007, vol.56, n.3, pp.127-130. ISSN 0120-2812.

At the county of Cruz de Amarillo, municipality of Pasto, Colombia , located al 2850 masl, a field study to determine the numbers of organisms and its biomass was carried out. Three land use systems were selected: prairie with the grass Lolium multiflorum (Ryegrass), pasture with Pennisetum clandestinum (kikuyu) and secondary forest. The prairie of .L multiflorum and the secondary forest showed the highest values of abundance of earth worms (5648 and 4864 ind m-2, respectively). Biomass was 141.3 and 670.7 gpfm-2 for L. multiflorum and P. clandestinum, respectively. Mites were abundant (2768 ind m-2) with a biomass of 0.22 gpfm-2. At all land use systems, the highest abundance of organisms and biomass at 2 depth of 0- 10 cm was found.

Palavras-chave : Typic melanudands; Typic melanudands; secondary forest.

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