Species diversity and dominance of Oligochaeta in copper and cadmium polluted soil

The aim of this study was to determine the dominance and species diversity of oligochaeta were studied incopper and cadmium polluted soil. This location is used for the garbage disposal of Jatibarang Landfill Semarang City residents, Central Java. Oligochaeta were collected from 5 research sites. The research method used is field experiment. Oligochaeta sampling was carried out based on a random sampling method. Oligochaeta sampling in Jatibarang Landfill was carried out at a depth of 25 cm. Analysis of oligochaeta diversity includes species diversity using the index formula Shannon-Wienner and dominance with the index formula Simpson. The species diversity (Shannon-Weiner Index) showed value of 0.191 (site 1), 0.411 (site 2), 0.539 (site 3), 0.137 (site 4), 0.443 (site 5) and the dominance calculated was 0.207 (site 1), 0.024 (site 2), 0.279 (site 3), 0.045 (site 4), 0.031 (site 5) which indicates that the diversity and the dominance were inversely related. The population density (individuals/m2) of the Oligochaeta species at 5 research sites showed variations. The total density of L. terrestris recorded was 280.66 (site 1), 59.66 (site 2), 130.33 (site 3), 136.66 (site 4), 62 (site 5), and the total density of Pheretrima sp 14 (site 1), 10 (site 2), 39 (site 3), 4.33 (site 4), 12 (site 5). Two species of Oligochaeta showed high richness whereas some were sparsely populated.