Abstract
+ and NO3 - -N ranges than that of the control, and the average of the lightly thinned site was significantly higher than that of the control for the other two thinning treatment. Average NH4 + concentrations were higher than the average NO3 - concentrations in all study sites, and the of extractable NH4 + concentrations were higher in the growing season of Jun and July, and then declined in the late summer and fall seasons. Nitrification rates were comparatively low and net N minerali- zation differed significantly by thinning management, and showed seasonal variations. For net N minerali- zation and nitrification rate during the study period, the lightly thinned site had a significantly higher aver- age than the other three sites.
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