中国连香树(Cercidiphyllum japonicum)生态适宜区及种群特征  

Ecologically suitable habitats and population characteristics of Cercidiphyllum japonicum in China

作　　者：曾超越 钟乾娟 王崇云[1] 胡艳萍 吴明慧 蒙薇 彭明春[1] ZENG Chao-yue;ZHONG Qian-juan;WANG Chong-yun;HU Yan-ping;WU Ming-hui;MENG Wei;PENG Ming-chun(Institute of Ecology and Geobotany,Yunnan University,Kunming 650091,China;Management Bureau of Yaoshan National Nature Reserve in Yunnan,Zhaotong 654600,Yunnan,China)

机构地区：[1]云南大学生态学与地植物学研究所,昆明650091 [2]云南省药山国家级自然保护区管护局,云南昭通654600

出　　处：《生态学杂志》2020年第8期2704-2712,共9页Chinese Journal of Ecology

基　　金：云南大学“双一流”建设重大项目(2018FY001(-002))资助。

摘　　要：连香树为国家二级保护植物,其种群自然更新困难且分布不连续。预测其潜在适生区可为划定不同区域连香树的保护和管理单元提供科学依据。本文根据连香树在中国的地理分布数据,结合22个环境因子,应用最大熵模型(MaxEnt)预测连香树在中国的潜在适生区,同时对比分析不同区域的连香树种群结构特征,探讨影响连香树现状分布及种群特征的生态因子。结果表明:连香树的潜在适生区主要集中于四川盆地西部边缘地区、神农架地区、秦巴山脉地区以及华东孤立的山地;气候因子和地形因子共同影响着连香树的分布,年均降水量、最冷月最低温、坡度和海拔对连香树潜在适生区影响最大;经主成分排序分析,11个调查地点的种群大致可划分为3组,即秦岭-大巴山脉种群、四川盆地西部边缘种群、中国东部地区种群;种群密度和存活率与环境因子的关系随连香树的不同生长阶段发生变化,连香树种群特征在生长前期与气候因子的相关性较强。Cercidiphyllum japonicum is one of the second-class national protected plant species in China,with extremely low ability of regeneration in isolated natural populations.The prediction of its suitable habitats can provide a scientific basis for delineating management units of C.japonicum in different regions.Based on the geographical distribution data of C.japonicum in China,22 environmental indicators were adopted in the MaxEnt model to predict its potential suitable habitats in China.We further compared the population structure of C.japonicum in different regions to clarify the ecological factors determining its distribution and population characteristics.The results showed that the potential suitable habitats of C.japonicum were mainly located in the western margin of the Sichuan Basin,Shennongjia,Qinling-Daba Mountains,and isolated hills in east China.Climatic and topographic factors had a joint influence on the distribution of C.japonicum.The factors which had main contribution to its potential suitable habitats included annual precipitation,the minimum temperature in the coldest month,slope,and altitude.Results of principal component analysis showed that the 11 populations surveyed in different regions could be divided into three groups,including populations in Qinling-Daba Mountains,populations in the western margin of Sichuan Basin,and populations in eastern China.Environmental factors had different effects on population density and survival rate of C.japonicum at different growth stages,with stronger correlation between population characters and climate factors at the early growth stage.

关 键 词：连香树 MaxEnt模型 潜在分布 种群特征 排序 环境因子 

分 类 号：S792.99[农业科学—林木遗传育种]