Comparative earthworm research in various ecosystems with different anthropic impact.

Using pedofauna research in the integrated agro -ecological monitoring is a necessary perspectiv e, considering that some populations, such as earthworms, characterize the potential soil fertility, health quality and vitality, providing thus ecological stability. Research of pedofauna with positive role for soil fertility allows to monitor the vitalit y and activity of soil biota and to avoid the critical levels. The present research was conducted in long term field experiments (41 years), in crop rotation, and in monoculture (55 years) at the Didactic Experimental Station "Chetrosu" of the State Agrari an University of Moldova, from Chisinau, Republic of Moldova. Earthwormsnumerical research was performed in six different crop agroecosystems, forest strip and in the Scientific Reserve "Codrii". There were investigated the morphological and physical -