Home – Home – Jornals – Contemporary Problems of Ecology 2002 number 2

The studies are dedicated to estimation of trophical conditions in the forests of permafrost zone of Middle Siberia. In the root-abiding layer of larch stands, an insignificant amount of total nitrogen, with the maximum in stands with a powerful development of the soil cover and litter bedding has been found. However, the proportion of its accessible forms, especially in the soil, is very large. Therein, dominant among the accessible fractions are easily and moderately hydrolyseable ones, in which free amino acids are abundantly present. The mineral nitrogen content of permafrost soils, and especially in the mineral layer, is insignificant. Organogenic horizons of larch stands where the main reserves of absorbing roots are concentrated are the main source of nitrogen for plant communities of this region, and here competition for nitrition elements arise between them at certain succession stages. P. 203-212