昆嵛山典型林下灌草层植物种间关系研究

Inter-specific relations of shrub and herbage species under a typical forest on Kunyu Mountain

用χ2检验、Ochiai关联度指数、Pearson相关和Spearman秩相关指数对昆嵛山典型林下灌草层植物的种间关系进行了研究.结果表明:(1)负相关的种对数远远大于正相关的种对数,呈显著相关和极显著相关的种对数所占比例较少,昆嵛山灌草层群落还处于演替当中.(2)Pearson相关检验在研究中有较大偏差,Spearman秩相关检验的灵敏度要大于χ2检验、Ochiai关联度检验和Pearson相关检验.(3)极显著相关的种对数:灌木和草本层之间的种对数>灌木层的种对数>草本层的种对数,灌木的存在为草本提供了良好的生存空间.(4)不同林型下灌草层物种的种间关系有所差异,杂木林的演替程度最高.

The inter-specific relations of shrub and herbage plant communities under a typical forest on Kunyu Mountain were studied by the Х^2-test, the Ochiai association index, Pearson＇ s correlation coefficient and Spearman＇ s rank correlation coefficient. First, the results indicate that the pairs having negative correlation are much larger than the positive correlation of all the species pairs. The proportion of species-pairs was small which has a significant or highly significantcorrelation. The shrub and herbage communities on Kunyu Mountain are in the phase of succession. Second, Pearson＇ s correlation coefficient test has big warp in the study. Compared with the Х^2-test, the Ochiai association test and Pearson＇s correlation coefficient test, Spearman＇ s rank correlation coefficient test is more sensitive. Third, the number of species-pairs having highly significant correlation are of the following order： between shrub layer and herbage layer 〉 shrub layer 〉 herbage layer. The shrub layer provided favorable living space for the herbage layer. Finally, the inter-specific relations of shrub and herbage layers are different in different forest types. The succession degree in shaw is the deepest one.