[N and P stoichiometric traits of plant and soil in different forest succession stages in Changbai Mountains].

The typical forest communities under four different succession stages in Changbai Mountains were selected to study the stoichiometric traits of stems and leaves of dominant species in different layers, and the relationships between these stoichiometric traits and terrain factors. The results showed that leaf nitrogen content (LNC) was significantly positively correlated with leaf phosphorus content (LPC) and stem nitrogen content (SNC), and positively with stem phosphorus content (SPC). The LPC was positively correlated with SPC and negatively with leaf N/P, stem N/P. The leaf N/P was positively correlated with stem N/P. SNC was positively correlated with SPC. There were significant differences in the stoichiometric traits of the plant species at tree layers among the different succession forest communities, while no obvious difference in shrub layers except for leaf N/P. Based on RDA analysis, it indicated that the plant communities in the Changbai Mountains is N-affected in the primary stage of succession, while N- and P-affected in the mid and later stages with a stronger impact from P.