Effects of soil variables and season on the production and consumption of nitric oxide in oxic soils

摘要: NO production rates, uptake rate constants, compensation points, and different soil variables were determined for various types horizons, checked mutual correlations. was detected in all, comsuption most soils tested. Only a very early state of genesis showed no consumption activity. positively correlated with water NH 4 + contents. rates not any variable. Both tended to decrease from the upper organic deeper mineral horizons climax soils. The seasonal variation calcic cambisol luvisol highest summer. few variables, but uniform, theoretically comprehensible pattern. However, samples stimulated by fertilization , 3 − inhibited nitrapyrin, indicating that produced nitrification. made up about 3% nitrification rates. In luvisol, contrast, affected addition or . Nitrification also undetectable this acidic soil, except patches where detected.