冰雪灾害前后的浙江古田山亚热带常绿阔叶林群落谱系结构变化  

The phylogenetic structure of a subtropical evergreen broad-leaved forest community before and after an ice-snow storm in Gutianshan,eastern China

作　　者：王衷涵 吴初平[2] 钱海源 余建平 袁位高[2] 沈爱华 陈声文 金毅[1] 于明坚[1] WANG ZhongHan;WU ChuPing;QIAN HaiYuan;YU JianPing;YUAN WeiGao;SHEN AiHua;CHEN ShengWen;JIN Yi;YU MingJian(College of Life Sciences,Zhejiang University,Hangzhou 310058,China;Zhejiang Academy of Forestry,Hangzhou 310023,China;Qianjiangyuan National Park Administration,Kaihua 324300,China;Zhejiang Forestry Technology Extended Station,Hangzhou 310020,China)

机构地区：[1]浙江大学生命科学学院,杭州310058 [2]浙江省林业科学研究院,杭州310023 [3]钱江源国家公园管理局,开化324300 [4]浙江省林业技术推广总站,杭州310020

出　　处：《中国科学：生命科学》2020年第4期373-380,共8页Scientia Sinica(Vitae)

基　　金：浙江省科技计划项目(批准号:2017C02028,2015C02016);国家重点研发计划政府间国际科技创新合作专项(批准号:2018YFE0112800);中央高校基本科研业务费专项(批准号:2019QNA6002)资助。

摘　　要：冰雪灾害是自然干扰的主要类型之一,为中高纬度地区森林群落更新的重要驱动因子.以往研究集中在冰雪灾害对群落动态的影响,鲜有分析冰雪灾害前后群落谱系结构的变化特点.本文以浙江省古田山国家级自然保护区内的亚热带常绿阔叶林作为研究对象,在2008年冰雪灾害前(2005年)和灾害后(2010年)分别进行了群落调查,并分别在3个粒度、4种地形生境和3个径级水平上分析了群落谱系结构在冰雪灾害前后的变化.研究发现,(ⅰ)在各个粒度、生境和径级水平上,灾后的群落净亲缘关系指数(net relatedness index,NRI)和净最近种间亲缘关系指数(net nearest taxa index,NTI)均明显高于灾前.(ⅱ)对灾前和灾后群落的植株存活进行随机模拟,并与其观测值进行比较发现,除3个径级以及2种生境的最近谱系距离(mean nearest taxon distance,MNTD)无明显差异外,其他情况下的MNTD以及所有情况下平均谱系距离(mean phylogenetic distance,MPD)的随机模拟期望值均显著大于观测值.以上结果表明,冰雪灾害后的群落谱系结构在各个空间粒度、森林垂直层次和生境中均变得更加聚集.本研究对于了解冰雪灾害干扰对于亚热带常绿阔叶林群落构建的影响,具有重要理论价值.Ice-snow storms are a major natural disturbance,and it is an important driver of forest regeneration in middle and high latitudes.Previous studies have focused on the impact of ice-snow storm on forest dynamics|however,few studies have investigated the impact of ice-snow storms on the phylogenetic structure of a forest community.In this study,we studied the phylogenetic structure of a 24-ha subtropical evergreen,broad-leaved forest in Gutianshan National Nature Reserve in Zhejiang Province before(2005)and after(2010)an ice-snow storm.We compared NRI and NTI of the community at three grain sizes,four topographic habitat types,and three size classes between before and after the ice-snow storm.Furthermore,we simulated random mortality during 2005–2010 and compared MPD and MNTD between observed values and random mortality in 2010.We found that(1)NRI and NTI were significantly higher after the storm across grain size,habitat,and size class.(2)Additionally,MNTD were not significantly different between random mortality and observed values in 2010 for the three size classes and two habitats,whereas all other cases showed that MNTD and MPD were significantly larger for random mortality than that for observed values.The results indicate that community phylogenetic structures of the study forest were more clustered after the storm,and they were little affected by grain size,vertical layer and habitat condition.This study improves our understanding of ice-storm disturbance on subtropical evergreen broad-leaved forest community phylogenetic structure.

关 键 词：干扰 亚热带 森林结构 垂直层次 生境 粒度 

分 类 号：S718.5[农业科学—林学]