The influence of anthropogenous factors on the number and structure of invertebrates of alluvial meadow soil community of Western Transbaikalia

The numerical structure, ratio of dominating groups and structural organization of invertebrates in soil system can serve as an important assess-ment of influence of anthropogenous factors on their existence in geospace of terrestrial surface. The research objective was to estimate the influ-ence of irrigating melioration and the way of agricul-tural use of invertebrate population of alluvial meadow soil in the conditions of arid landscape conditions of Western Transbaikalia. Depending on irrigation and the way of agricultural use of studied soil in geotops of arid landscape from 8.01 to 157.21 pieces/sq.m were caught. In total 309.2 copies of pedobiont on 1 sq.m beloning to 2 clas-ses, 4 groups and 15 families were caught. It was revealed that soil cultivation in the conditions of bogara and irrigation led to decreasing in numerical structure of invertebrates. The irrigation of long-term herbs reduced mesofauna number in compar-ison with virgin analog by 1.8 times, and at the same time in this geotop there was a class of myriapods (Myriopoda) in number of 2.67 piec-es/sq.m. When replacing natural fitotsenosis with crops of long-term herbs some families disap-peared. The maximum structural variety of commu-nity of invertebrates was recorded under crops of long-term herbs against artificial overhead irrigation - 2 classes, 4 groups and 10 families. Anthropogenous factors unambiguously reduce the number of invertebrates in agrogene phytocenosis. However, in man-made phytocenosis with irrigation and without irrigation the growth of structural variety in community of invertebrates was observed. As a result it was established that irrigating melioration was limiting factor of falling of the number of pedobiont in the alluvial meadow soil of Western Transbaikalia.