ROLE OF DETRITIVORE SOIL ARTHROPODS IN NUTRIENT RELEASE AS AFFECTED BY PESTICIDE CONTAMINATIONR. PRAMANIK, K. SARKAR AND V.C. JOYAbstract To feeding effect of soil arthropods namely Porcellio laevis (Isopoda : Crustacea) and Anoplodesmus saussorei (Polydesmida Diplopoda) on the rate of mobilization of important nutrients from decomposing iitter was compared under microcosm conditions. Comminution by both species could enhance release calcium and organic carbon but efficiency of the dip/opod was notably more in all the cases. Microbial actionOil leaf litter was sufficient to release potassium significantly but in all other cases the detritiovore ntribtition in sequestering nutrients was evident. Feeding interaction between the two species had umulative and synergistic impact on the enrichment of nutrients in the sand medium. Pesticide ccontobiation of leaf litter through treatment of sublethal concentration of heptachlor 20 EC and eodnolfan 35 EC could suppress faunal activity and release of the nutrients. The inhibitory effect of both sticid could be noticed on the level of calcium and organic carbon. The fauna mediated mobilization ees Pof nitrate nitrogen was strongly inhibited by endosulfan whereas that of calcium and potassium were illently reduced by heptachlor.
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