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The dominant species of earthworms in Amur region are E. nordenskioldi (f. pallida and f. tipica) and Dr. ghilarovi. The maximum biomass of megadrilids was noted in biotopes of the zone of mixed forests and makes 50 to 90% of the whole complex of soil invertebrates. The detritophagans daily ingest the amount of soil equal to 20—80 % of their live weight. Worms consuming forest litter ingest only 1.5—2% of their weight. Two methods of calculation of nutritional requirements of earthworms (the estimation of the weighted mean value of ration and the use of correlative dependence of this value on body weight) show similar results. Megadrilids consume throughout the vegetation period 10% of the forest litter in forest ecosystems and 0.2% of root mass in meadow ones. That make 20% and 100% respectively of the total amount of organic matte consumed by large saprophagans. The cast production was found to be 0.7 to 5.6 t/ha in various types of forests, 20t/ha in meadows and 0,3 to 1.2t/ha in marshlands. Earthworms ingest at an average 2/3 of the total flow of biogenic elements consumed by large saprophages.