Ananalysis of the population quantitative characteristics of Carpinus tientaiensis and its associations with other tree species
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摘要:
目的 分析极小种群天台鹅耳枥Carpinus tientaiensis所在群落和种群数量特征及其与其他物种的种间关系，探讨其濒危原因和保护策略。 方法 采用样方法调查浙江省景宁畲族自治县上山头天台鹅耳枥群落，计算径级分布、重要值、多度和胸高断面积，测定种间联结值和群落稳定性指数。 结果 群落中天台鹅耳枥重要值排在第3位，个体数量占乔木层树种的10.6%，胸高断面积占17.79%，是群落的主要优势种之一。天台鹅耳枥最大胸径为74.6 cm，1~4 cm胸径的小径级个体和30 cm以上胸径的大径级个体分别占群落相应径级的90.00%和66.11%，但4~20 cm胸径的个体仅占群落的7.91%，且缺乏1 cm以下胸径的个体。共同出现百分率和联结系数显示：天台鹅耳枥与群落类内其他物种间关系复杂，χ2检验表明天台鹅耳枥与5个树种竞争强度较大。 结论 天台鹅耳枥在群落中具优势地位，但存在种群更新限制，且中等径级个体在群落中占比较小，受到的竞争压力较大。可采用间伐等方式适当降低天台鹅耳枥4~20 cm胸径个体的竞争压力，并为幼苗定植和生长提供必要的光环境。图4表1参24 Abstract:Objective With an analysis of the population and community characteristics of Carpinus tientaiensis, an extremely small population as well as its interactions with other trees species, this study is aimed to explore its endangerment mechanisms so as to propose workable protection strategies. Method Sampling method was first used to investigate the community characteristics in Shangshantou, Jingning She Nationality Autonomous County of Zhejiang Province, and indicators including the importance value, species abundance, distribution of the diameters at breast height (DBH) and inter-specific associations were analyzed. Result C. tientaiensis is one of the main dominant species in the community with the largest DBH 74.6 cm, ranking the third in importance value and accounting for 10.6% of the total tree species number, while 17.79% of the total basal area. Individuals with DBH of 1−4 cm and above 30 cm accounted for 90.00% and 66.11% of the total trees in the community respectively, while those with DBH of 4−20 cm only took up 7.91%. Strong inter-specific associations between C. tientaiensis and other species were found by means of association coefficient and percentage of co-occurrence whereas χ 2 test indicated that C. tientaiensis was in intense competition against 5 other tree species. Conclusion Although C. tientaiensis, is one of the dominant species in the community, it has displayed population regeneration limitation with individuals with DBH at 4−20 cm found, thus faced with strong competition from other species. It was suggested that intermediate felling measures should be taken to reduce the competitive pressure of C. tientaiensis and necessary light environment should be provided for seedling settlement and tree growth. [Ch, 4 fig. 1 tab. 24 ref.] -
图 1 天台鹅耳枥群落多度和胸高断面积累积
Figure 1 Cumulative percentage of species abundance and area at breast in C. tientaiensis communities
图 2 天台鹅耳枥所在群落的Godron稳定性
Figure 2 Godron community stability in C. tientaiensis community
图 3 天台鹅耳枥所在群落(A)和天台鹅耳枥(B)径级分布
Figure 3 Distribution of diameter at breast height of the community (A) and C. tientaiensis (B)
图 4 天台鹅耳枥与群落内主要树种之间的种间联结值
Figure 4 Interspecific association between C. tientaiensis and other tree species
表 1 天台鹅耳枥所在群落重要值排前10位物种
Table 1. Top 10 tree species of importance value in C. tientaiensis communities
序号 学名 多度 重要值/% 序号 学名 多度 重要值/% 1 云锦杜鹃 Rhododendron fortunei 1 245 26.84 6 毛果珍珠花 Lyonia ovalifolia var. hebecarpa 145 4.79 2 白檀 Symplocos paniculata 448 12.98 7 多脉青冈 Cyclobalanopsis multinervis 88 4.49 3 天台鹅耳枥 Carpinus tientaiensis 354 12.73 8 水青冈 Fagus longipetiolata 65 3.67 4 黄山松 Pinus taiwannensis 120 8.50 9 红果山胡椒 Lindera erythrocarpa 57 3.02 5 微毛柃 Eurya hebeclados 255 7.79 10 交让木 Daphniphyllum macropodum 44 2.60 
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