Effects of nitrogen fertilizer, soil moisture and temperature on methane oxidation in paddy soil.

摘要

Effects of nitrogen fertilizer, soil moisture and temperature on methane oxidation in paddy soil were investigated. Addition of 0.05 g N/kg soil as NH4Cl strongly inhibited methane oxidation and addition of the same rate of KCl also inhibited the oxidation but with a slighter effect suggesting that the inhibitory effect was partly caused by increase in osmotic potential in microorganism cells. Both NH4+ and NO3- affected methane oxidation. Urea did not affect methane oxidation in paddy soil in thefirst two days of incubation, but a strong inhibitory effect was observed afterwards. Methane was oxidized in the treated soil with an optimum moisture of 280 g/kg, and air drying inhibited methane oxidation entirely. The optimum temperature of methane oxidation was _30 degC in paddy soil, while no methane oxidation was observed at 5 or 55 degC.