Ecological assessment of soil cover of cervine pastures of the Yamal peninsula condition

In the study ecological assessment of the condi-tion of soil cover for development of actions for res-toration of industrially broken lands (reindeer pas-tures) on Bovanenkovo gas field was considered. The results of researches have shown that the acidity of the investigated soil samples, due to the presence of free hydrogen ions, ranged from 4.7 to 7.3 Ph; on anthropogenically disturbed soils the amount reached 9.1 Ph. In the surface soil horizon iron concentration ranged from 4623 to 26496 mg/kg. The oil content of the selected soil samples ranged from 109 to 14627 mg/kg, the maximum values were observed in anthropogenically disturbed tundra eluvial- gley and anthropogenically disturbed tundra everglade, and were respectively 14627 and 13902 mg/kg; these soil data relate to heavily polluted. Soils under re-search had low reserves of nutrients, soils have low rates of grounds, in particular in areas formed on the light mechanical composition rocks. There was a trace amount of organic substances content in mineral ground, ranging of 1.2 to 48 %. The maintenance of nutrients of plants in soils (back-ground, transformation border) of considered types made: mobile phosphorus - 0-190.0 mg/kg, potas-sium - 20.0-237.0; general nitrogen - 0.06-0.28 mg/kg. The analysis of chemical properties of soils depending on their particle size distribution con-vincingly testified about essential distinctions of physical and chemical and agrochemical character-istics. On sandy loams the content of iron in tundra eluvial and gley soils made 13748-18228 mg/kg while loamy soils contain iron in concentration of 433-8349 mg/kg. According to the received results, it was possible to note that agrochemical properties of sandy soils were adverse, i.e. were highly acidic and had acidic reaction in a root inhabited layer, contained the smallest stocks of organic substance (on average 1.6 %).