【摘要】 采用样方调查法,对长春南湖公园油松林的乔木物种组成和区系特征进行分析;基于一阶格局检验判别理论,并选用径级作为龄级代用指标,研究了油松林的物种结构格局。结果表明:南湖公园油松林乔木共7科9属10种,组成较为单一,科、属、种配置不合理;区系特征明显,科级类别以泛热带居多,混有世界广布科和北温带分布科,属级类别以北温带为主;研究样方中,油松的个体数量、重要值均占绝对优势,但在胸径、高度上优势不明显;径级分布总体呈现正态分布,种群以中龄乔木为主,近熟、成熟乔木次之,幼苗、幼树稀少,属稳定型种群,更新能力较差;油松种群整体为聚集分布,样方尺度上以均匀分布为主,而不同龄级的油松聚集程度判别结果不一致,随空间尺度的缩小,油松格局呈现从聚集向均匀分布的趋势。更多还原

【Abstract】 We analyzed the community structure and floristic characteristics of Pinus tabuliformis forest in the South Lake Park in Changchun. Based on the first-order pattern test discriminant theory,the species composition and structure of P. tabuliformis forest were studied using diameter class as an age-level proxy indicator. The results showed that the trees belong to seven families,nine genera and 10 species. That means the tree composition was monotonous and unreasonable at species,genus,and family levels. The floristic element at the family level was mainly dominated by pan-tropical with certain proportions of cosmopolitan and north temperate elements. The north temperate was the dominant of genus. The abundance and importance value of P. tabuliformis in the communities were predominant,but its dominance in DBH and height was not obvious. There was a normal distribution in diameter class for P. tabuliformis. The communities were dominated by middle-aged trees,followed by near-mature and mature trees,with few seedlings and saplings.These communities were stable but with poor regeneration ability. The P. tabuliformis population in all the communities showed aggregated distribution,while a uniform distribution occurred on each single plant community. The types of population aggregation changed with different ages in spatial pattern discrimination. With the shrinking of the spatial scale,the distribution pattern of P. tabuliformis population changed from aggregated type to uniform type.更多还原