天台鹅耳枥种群数量特征及其与其他树种的关联性  

Analysis of the population quantitative characteristics of Carpinus tientaiensis and its associations with other tree species

作　　者：许元科 赵昌高 廖瑜俊 林坚 吴传波 吴初平[2] 王志高 XU Yuanke;ZHAO Changgao;LIAO Yujun;LIN Jian;WU Chuanbo;WU Chuping;WANG Zhigao(Center of Ecological Forestry Development of Jingning She Nationality Autonomous County,Jingning 323500,Zhejiang,China;Zhejiang Academy of Forstry,Hangzhou 310023,Zhejiang,China)

机构地区：[1]景宁畲族自治县生态林业发展中心,浙江景宁323500 [2]浙江省林业科学研究院,浙江杭州310023

出　　处：《浙江农林大学学报》2022年第4期758-764,共7页Journal of Zhejiang A&F University

基　　金：景宁畲族自治县科技计划项目(2020A10);浙江省财政厅省级林业专项资金(浙财建[2019]124号)。

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,χ^(2)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。[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 interspecific 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.]

关 键 词：极小种群 天台鹅耳枥 群落地位 群落稳定性 种间关联 

分 类 号：Q948[生物学—植物学]