闽北天然针阔混交林优势乔木树种间协变研究

采用Pearson积矩系数、Spearman秩相关系数和方差分析，对闽北天然针阔混交林15个优势乔木树种间的协变进行了研究．结果表明，除甜槠与木荷、苦槠与冬青、润楠与米槠间表现出显著的正协变，马尾松与栲树、木荷和若槠、锥粟间表现出显著负协变外，多数种群间的协变不显著，趋于各自独立．这反映出闽北天然针阔混交林群落的不稳定性．研究结果对混交林树种配置和抚育管理都具有理论指导作用．

The Pearson Interspecific Covariant of Dominant Species in Naturally Mixed Needle-leaved and Broad-leaved Forest in Northern Fujian

The Pearson product-moment correlation parameter,Spearman rank correlation parameter,and variance analysis were used to determine the Pearson interspecific covariant of 15 dominant species in Northern Fujian. The relationships between Castanopsis egrei and Schima superba,Castanopsis sclerophglla and flex purpurea,Machilus pingii and Castanopsis carlesii are significantly positively covariant; the relationships between Pinus massoniana and Castanea fargesii,Schima superba and Castanopsis sclerophylla,Castanea henrgi are significantly negatively covariant;and those between the other species are not significant covariant. These relations show that the naturally mixed needle-leaved and broad-leaved forests in Northern Fujian are not stable. The study results have an important theory-conducting function to species disposition and cultural management of mixed needle-leaved and broad-leaved forests.