Abstract:

In order to show the effects of Effective Microorganisms (EM) on earthworms and the role of their turning over elements in polluting soil, earthworms were covered up with soil with different amounts of EM added. After 28 d, earthworms’ body mass and cocoon numbers were measured. The mass ratios of soil organic matter, nitrogen and phosphorus were analyzed. The results show that the body mass of earthworms declined and daily body mass increments  were negative values after experiments. The body mass reduction, daily body mass  increments, and cocoon numbers of earthworms in the polluted soil with different amounts of EM were lower than those of the ones in the control without addition EM. The mass ratio of organic matter, total nitrogen, total phosphorus and pH values of soil with different amounts of EM were lower than those of that without EM and with only earthworm. The alteration laws of mass ratios of ammonium nitrogen, nitrate nitrogen and available phosphorus of soil with EM added were contrary to the aboved mentioned alternative rule.

Key words: earthworm, Effective Microorganisms (EM), polluted soil, element transform