An unprotected vulnerable relict subtropical conifer-Keteleeria evelyniana: Its forests, populations, growth and endangerment by invasive alien plant species in China  

作　　者：Cindy Q.Tang Min-Rui Du Huan-Chong Wang You-Cai Shi Jia-Le Zeng Shu-Li Xiao Peng-Bin Han Jian-Ran Wen Shi-Qian Yao Ming-Chun Peng Chong-Yun Wang Yong-Ping Li Jordi López-Pujol 

机构地区：[1]Institute of Ecology and Geobotany,College of Ecology and Environmental Science,Yunnan University,Building#3,Guozhong Dalou,Dongwaihuan South Road,University Town,Chenggong New District,Kunming 650504,Yunnan,China [2]College of Life Sciences,Yunnan University,Shengming Kexueyuan Building#2,Chenggong Campus,Dongwaihuan South Road,University Town,Chenggong New District,Kunming 650504,Yunnan,China [3]College of Natural Resources,Yunnan University,Chenggong Campus,Dongwaihuan South Road,University Town,Chenggong New District,Kunming 650504,Yunnan,China [4]Botanic Institute of Barcelona(IBB,CSIC-CMCNC),Passeig del Migdia s/n,Barcelona 08038,Catalonia,Spain [5]Escuela de Ciencias Ambientales,Universidad Espíritu Santo(UEES),Samborondon 091650,Ecuador

出　　处：《Plant Diversity》2024年第5期648-660,共13页植物多样性（英文版）

基　　金：funded by the Major Program for Basic Research Project of Yunnan Province,China,grant number 202101BC070002;the Special Foundation for National Science and Technology Basic Resources Investigation of China,grant number 2019FY202300.

摘　　要：Relict subtropical coniferous forests in China face severe fragmentation,resulting in declining populations,and some are under significant threat from invasive alien species.Despite the crucial importance of understanding forest dynamics,knowledge gaps persist,particularly regarding the impact of invasive plants on vulnerable natives like Keteleeria evelyniana.In this study,we investigated the impact of invasive plants on the regeneration of forests dominated by K.evelyniana,a subtropical relict species in southwestern China.For this purpose,we characterized forest dynamics of 160 forest plots featuring K.evelyniana as the primary dominant species and determined whether the presence of invasive plants was correlated with regeneration of K.evelyniana.We identified four distinct forest types in which K.evelyniana was dominant.We found that radial growth of K.evelyniana trees is faster in younger ageclasses today than it was for older trees at the same age.The population structure of K.evelyniana in each forest type exhibited a multimodal age-class distribution.However,three forest types lacked established saplings younger than 10 years old,a situation attributed to the dense coverage of the invasive alien Ageratina adenophora.This invasive species resulted in a reduction of understory species diversity.Additionally,our analysis uncovered a significant negative correlation in phylogenetic relatedness(net relatedness index)between native and invasive alien plant species in eastern Yunnan.This suggests closely related invasive species face heightened competition,hindering successful invasion.Taken together,our findings indicate that successful establishment and habitat restoration of K.evelyniana seedling/saplings require effective measures to control invasive plants.

关 键 词：Keteleeria evelyniana Age structure Regeneration Species diversity Invasive alien species Phylogenetic relatedness 

分 类 号：S791.15[农业科学—林木遗传育种]