Interspecific Relations of the Dominant Plant Populations in the Middle Part of Zhongtiaoshan Mountain

The interspecific relations of twenty four dominant species of the flora in the middle part of Zhongtiaoshan Mountain were studied by dint of χ2 test with 2×2 contingency table,Ochiai association index,Pearson correlation and Spearman's rank correlation.The results revealed that (1) of all the species pairs,the pairs that present significant and extremely significant differences accounted for a low proportion and the pairs that appeared negatively correlated made up a majority;(2) the proper conclusions of this study depended upon the proper combination of χ2 test with Ochiai association index;(3) in the study,Spearman's rank correlation analysis presented a high sensitivity and performed better than Pearson correlation analysis;(4) the twenty four species could be divided into five ecological groups and the different species in the same groups appeared strongly and negatively correlated,which indicated that they had similar resource-utilizing ways and ecological requirements;and but the species in different groups showed a poor correlation.Quercus aliena,Quercus dentata,Corylus heterophylla,and Forsythia suspensa appeared independent.