Abstract: Based on the quadrat survey and the analysis of Pteroceltis tatarinowii community structure in Lishan, this paper measured the interspecific covariation coefficients of dominant species, and, in combining with canonical correspondence analysis and cluster analysis, approached the interspecific relationships between P. tatarinowii and other species. In the study area, the A class frequency (1%-20%) of P. tatarinowii community occupied the absolute superiority. P. tatarinowii occupied the dominant position in the community, but the dominance in succession layer and regeneration layer was inferior to that of other species. The results of Spearman rank correlation analysis and Pearson correlation analysis were basically consistent, i.e., the number of positive covariation couplets in tree layer was lower than that of negative covariation couplets, the negative covariation between the couplets P. tatarinowii and Diospyros lotus was the highest, and in all of the significant or positively significant covariation couplets that contained P. tatarinowii, the P. tatarinowii and another species were always in significant or very significant negative correlation. Slope, soil moisture content, and litter thickness had strong correlations with 3 ordination axes, the classification of 18 dominant tree species along the second axis was more consistent with the characteristics of the species, and soil moisture content was the dominant factor affecting the distribution of P. tatarinowii. Cluster analysis showed the dominant tree species in the tree layer of P. tatarinowii community could be divided into three categories.

Key words: Huang-Huai-Hai Plain, soil organic carbon, spatial variability, sequestration rate.