Abstract: This paper studies the producing condition of N₂O and its dynamics in soils with application of various varieties of nitrogen fertilizer （ammonium sulfate, urea and ammonium carbonate）. The results show that the gaseous loss of various nitrogen fertilizers in the form of N₂O is decreased in the order: urea>ammonium sulfate>ammonium carbonate. The denitrification rate in soils with different moisture content and applicated with various varieties of nitrogen fertilizer is declined with time to a similar level. Its variation range is 4.12—7.29%.

Key words: Ecosystem, Degradation degree, Chinese pine, Western Liaoning Province