[Influence of temperature and moisture on soil nitrogen mineralization under two types of forest in Changbai Mountain].

The effect of temperature(t) and soil water content(theta) on soil nitrogen mineralization under coniferous-broadleaved and spruce-fir coniferous forests was evaluated by using laboratory incubation method. Based on the analysis of inorganic nitrogen in soil extracts before and after incubation, it was showed that the net mineralization rate of soil nitrogen was positively related to t(alpha < 0.001) from 5 degrees C to 35 degrees C, and to water content when water contents was low, but there was a decrease in net mineralization rate when the water content was above an optimum value. The result suggested the interactive effect of temperature and moisture on the mineralization of soil nitrogen. Two dimensional (t, theta) equations to describe the effect were drawn up.