Abstract
The effects on nitrification and acidification in three subtropical soils to which (NH 4) 2SO 4 or urea had been added at rate of 250 mg N kg −1 was studied using laboratory-based incubations. The results indicated that NH 4 + input did not stimulate nitrification in a red forest soil, nor was there any soil acidification. Unlike red forest soil, (NH 4) 2SO 4 enhanced nitrification of an upland soil, whilst urea was more effective in stimulating nitrification, and here the soil was slightly acidified. For another upland soil, NH 4 + input greatly enhanced nitrification and as a result, this soil was significantly acidified. We conclude that the effects of NH 4 + addition on nitrification and acidification in cultivated soils would be quite different from in forest soils. During the incubation, N isotope fractionation was closely related to the nitrifying capacity of the soils.
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