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  • Title: Long-term monitoring of tree population dynamics of broad-leaved Korean pine forest in Changbai Mountains, China.
    Author: Xu WZ, Liu QJ, Meng SW, Zhou G.
    Journal: Ying Yong Sheng Tai Xue Bao; 2018 Oct; 29(10):3159-3166. PubMed ID: 30325138.
    Abstract:
    Based on four investigations of a one-hectare permanent plot in Changbai Mountains from 1981 to 2016, the changes of tree species composition and structure of broad-leaved Korean pine forest were examined, and diameter distribution, spatial pattern distribution, and quantitative changes of each tree species were analyzed. The results showed that there were little changes in tree species composition and an overall decreasing trend in total density in 35 years. Both basal area and stand volume were 43-45 m2·hm-2 and 474-496 m3·hm-2, respectively. Pinus koraiensis was the most dominant species, whose basal area and volume accounted for 57.8%-59.7% and 62.5%-65.4% of the total in the community, respectively. All dominant species showed random distribution and changed little in 35 years. The DBH distribution of P. koraiensis was in a near-to-normal form. Total species showed a reversed "J" shape. The number of dead trees was the largest in small DBH class (10-26 cm) with the percentage of 30%. The percentage of dead trees was the largest in intermediate class (30-50 cm) with 30%-50%. Except Acer mono, all species in the tree layer showed little recruitment, with mortality rate being higher than recruiting rate. Specially, P. koraiensis had no saplings or recruitment, and the population was in decline. The regeneration of dominant species such as P. koraiensis and Tilia amurensis was hindered in the original broad-leaved Korean pine forest, the population maintenance of which might need natural disturbance. 基于1981—2016年对长白山阔叶红松林固定样地(面积 1 hm2)4次调查的监测数据,研究了阔叶红松林树种组成与结构的变化特征,分析了各树种的径阶分布、空间分布、数量变化等.结果表明: 35年间,林分的树种组成变化不大,林分总密度呈下降趋势.总胸高断面积和蓄积量分别为 43～45 m2·hm-2和474～496 m3·hm-2,其中,红松的优势度最大,胸高断面积和蓄积量分别占57.8%～59.7%和62.5%～65.4%.所有优势树种的空间分布无明显变化,均呈随机分布.其中,红松的径级结构呈近似正态分布,乔木层全部树种的径级结构呈倒 “J” 型分布.小径级(10～26 cm)死亡个体的绝对数量最多,死亡比例为30%,而中径级(30～50 cm)死亡比例最高,为30%～50%.乔木层中除色木槭外的主要树种均没有明显进阶,死亡率高于更新率,特别是红松,完全没有更新或进阶,种群处于衰退状态.原始阔叶红松林中红松、紫椴等优势树种的更新受到阻碍,这些树种的种群维持可能需要自然干扰.
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