We conducted a field experiment using mesocosms during the growing season to evaluate the effects of endogeic earthworms - the invasive and , and the native - on soil organic matter content in Calcic Chernozem. We established that the vertical distribution of soil organic matter within the humus horizon depends on the earthworm species and their interactions. The highest content was observed in the variants containing the native species.
D.P. Unru (Wed,) studied this question.