By the technique of principal component analysis (PCA) combined with ecological characteristics of each plant species in the virgin forests on the south slope of Xiaoxingan Mountains,plant ecological species groups (ESG) were divided.

• 应用主成分分析技术,并结合小兴安岭南坡原始林中植物种的生态特性,对该区的植物生态种组进行划分。