Quantifying soil macrofauna in a Colombian watershed

From April to September 1994, macrofauna density, total biomass, and specie s diversity of earthworms were measured across a range of land use types in the Cabuyal River watershed. The methodology recommended by the Tropical S oil Biology and Fertility Program (TSBF) was used. Macrofauna density, biom ass, and diversity of earthworm species varied considerably across land use types, and depths. Principal component analysis yielded three factors that accounted for 71.8% of the total variance in macrofauna density. High taxo nomic units values occur in the Andean forest (98 observed), decreasing dra matically in pastures (ranging from 28 to 13) and farm lands (ranging from 31 to 18).