濒危植物长序榆种群径级结构及其生命表分析  

Diameter Structure and Life Table of Ulmus elongata Community in Zhejiang

作　　者：毛仙龙 吴伟建 王军峰 何小勇 潘跃武 杜有新 MAO Xianlong;WU Weijian;WANG Junfeng;HE Xiaoyong;PAN Yaowu;DU Youxin(Songyang Natural Resources and Planning Bureau of Zhejiang,Songyang 323400,China;Research&Management Center of East ChinaMedicinal Botanical Garden,Lishui 323000,China;Lishui Forestry Extension Station of Zhejiang,Lishui 323000,China)

机构地区：[1]松阳县自然资源和规划局,浙江松阳323400 [2]华东药用植物园科研管理中心,浙江丽水323000 [3]丽水市林业技术推广总站,浙江丽水323000

出　　处：《浙江林业科技》2023年第4期19-24,共6页Journal of Zhejiang Forestry Science and Technology

基　　金：丽水市公益性技术应用研究项目(2019GYX14);浙江省林业生物多样性保护项目(33112410150002)。

摘　　要：以浙江省松阳县三都乡水竹村长序榆Ulmus elongata野生居群为研究对象,通过典型样地调查,并编制生命表以及生存曲线,分析长序榆种群的分布格局及其径级结构特征。结果表明,长序榆群落乔木层中长序榆的重要值为57.91%,为该群落的绝对优势树种,重要值大于1%的乔木层树种还有杉木Cunninghamia lanceolata、红楠Machilus thunbergii、青冈Cyclobalanopsis glauca、柳杉Cryptomeria fortunei、南方红豆杉Taxus chinensis var.mairei、马尾松Pinus massoniana、鹅掌楸Liriodendron chinense、黄檀Dalbergia hupeana、香椿Toona sinensis、朴树Celtis sinensis和枫香树Liquidambar formosana等12种。长序榆种群空间上呈现集群分布格局,种群径级结构总体上呈倒“J”形。径级Ⅰ的幼树个体数量大,占种群个体总数的83.1%,但早期阶段死亡率高,径级Ⅰ~Ⅲ的个体死亡率均在68.4%以上,径级Ⅳ~Ⅶ个体的死亡率均低于35%,至径级Ⅷ时个体死亡率再次升高至50%,此后趋于稳定,种群最大生命期望值出现在径级Ⅸ。该种群自然更新状态较好,种群的存活曲线近于Deevey-Ⅲ型,属于增长型种群,但长序榆种群早期死亡率较高,是造成该种群成年植株稀少的主要原因。In August 2021,8 sample plots of 20 m×30 m were established in Ulmus elongata community in Songyang,Zhejiang province for determination of DBG/ground diameter height of every U.elongata,and DBH,height,quantity of associated tree species,importance value of each tree species was calculated.The results showed that the important value of U.elongata was 57.91%,absolutely dominant tree species in the community.There were also 12 tree species with important value more than 1%at arbor layer such as Cunninghamia lanceolata,Machilus thunbergii,Cyclobalanopsis glauca,Cryptomeria fortunei,Taxus wallichiana var.mairei,Pinus massoniana,Liriodendron chinense,Dalbergia hupeana,Toona sinensis,Celtis sinensis and Liquidambar formosana.U.elongata was clustered distribution,and the diameter structure like inverted J-shaped mode.The individuals of diameter class I(DBH<5 cm,interclass of 5 cm)including seedlings and saplings accounted for 83.1%of the total individuals,but with higher mortality rate in the community.The mortality rate of individuals of diameter class I-III was more than 68.4%,while that of individuals of diameter class IV-VII lower than 35%.The mortality rate of individuals of diameter class VIII increased to 50%,and then steady.The maximal life expectancy of the community occurred at diameter class IX.The investigation demonstrated good natural regeneration of U.elongata community.The survival curve of the community was approximated to the Deevey-Ⅲmodel,indicating expanding community.The high mortality of younger individuals was the main cause of rare mature individuals in the community.

关 键 词：长序榆种群 分布格局 径级结构 生命表 

分 类 号：Q948.1[生物学—植物学]