FAUNA EDÁFICA EM SISTEMA DE PLANTIO HOMOGÊNEO, SISTEMA AGROFLORESTAL E EM MATA NATIVA EM DOIS MUNICÍPIOS DO RIO GRANDE DO SUL, BRASIL

Abstract

Edaphic fauna in homogeneous plantation, agroforestry and native bush systems at two cities in Rio Grande do Sul, Brasil. The soil fauna composition was evaluated in three environments. The present work, was analyzed the relations of the distinct groups of organisms in two different crop systems (homogeneous crop system, agroforestry system), beyond an area of native vegetation at South Half of the Rio Grande do Sul, in the Morro Redondo and Pinheiro Machado cities. The material collection occurred in the Abril/2007 maio/2007 period. The collections had been made by the use of Tretzel and Tullgren extractors. Five points had been sampled equidistant 20m each other and following an only line or squares depending on the relief. They are presented the total of organisms in each environment, the more frequent group, index of similarity and diversity in each environment. Collembola predominance was observed in the agroforestry system and Araneae in the homogeneous plantation and native vegetation. The differences found in the taxonomic diversity and frequency of each taxa in study environments are presented.