摘要
以贵州安顺西秀区云南油杉林固定监测样为对象,通过设立1 hm^(2)固定监测样地,采用α多样性指数、生态位测定、方差比率法(VR)、χ^(2)检验、Spearman秩相关及M.Godron稳定性测定等方法,对云南油杉林乔木层优势树种的多样性、生态位特征、种间联结性与群落稳定性进行分析。结果显示:(1)云南油杉林样地乔木共有12个科16属19种,物种多样性处于中等水平,但树种分布均匀度较低;(2)云南油杉的重要值达38.77%,生态位宽度最大(Levins指数19.54),云南油杉与多数树种重叠度较高(>0.5),表明云南油杉在资源利用上占据主导地位;(3)种间关联性分析表明群落总体呈不显著负关联(VR=0.98),χ^(2)检验和Spearman相关分析均未发现显著关联种对,表明伴生树种间相互作用较弱;(4)M.Godron稳定性分析显示交点(23.15,76.85)接近稳定点(20,80),群落处于相对稳定状态,但这种稳定性依赖于云南油杉的种群优势。该研究揭示了云南油杉单优群落中生态位高度重叠而种间关联松散的特殊格局,为理解单优群落维持机制及云南油杉濒危种群保护提供了科学依据。
Taking the fixed monitoring plot of Keteleeria evelyniana forest in Xixiu District,Anshun,Guizhou as the research object,by setting up a 1 hm^(2)fixed monitoring plot and using methods such as theα-diversity index,niche determination,variance ratio method(VR),chi-square test,Spearman rank correlation,and M.Godron stability determination.This study analyzed the diversity,niche characteristics,interspecific association,and community stability of the dominant tree species in the tree layer of K.evelyniana forest.The results showed that:(1)The tree layer in the K.evelyniana forest plot comprised 19 species,16 genera,and 12 families,exhibiting moderate tree species diversity coupled with low evenness;(2)K.evelyniana has an importance value of 38.77%and the greatest niche breadth(Levins index:19.54).It exhibited a high degree of niche overlap(>0.5)with most tree species,indicating its dominant role in resource utilization;(3)The interspecific association analysis showed that the community was generally not significantly negatively associated(VR=0.98),and no significantly associated species pairs were found by theχ^(2)test and Spearman correlation analysis,reflecting weak interactions among the associated tree species;(4)The M.Godron stability analysis showed that the intersection point(23.15,76.85)was close to the stable point(20,80),indicating that the community was in a relatively stable state,but this stability relied on the population advantage of K.evelyniana.This study revealed the special pattern of high niche overlap but weak interspecific associations in the K.evelyniana monodominant community,providing a scientific basis for understanding the maintenance mechanism of monodominant communities and the conservation of endangered K.evelyniana populations.
作者
陈秋富
何爽
卢永飞
戴晓勇
袁丛军
陈梦
CHEN Qiufu;HE Shuang;LU Yongfei;DAI Xiaoyong;YUAN Congjun;CHEN Meng(Guizhou forestry foreign cooperation and industrial development center,Guiyang Guizhou 55001,P.R.China;Guizhou Academy of Forestry,Guiyang Guizhou 550005,P.R.China;Leigong Mountain Forest Ecosystem National Positioning Observation and Research Station,Leishan Guizhou 557100,P.R.China)
出处
《西部林业科学》
北大核心
2025年第6期95-103,共9页
Journal of West China Forestry Science
基金
黔科合基础QN[2025]380,黔科合基础-ZK[2021]一般097,中央林业草原生态保护恢复资金国家重点野生动植物保护补助项目“贵州省2025年度珍稀濒危野生植物监测项目”。
关键词
云南油杉林
群落组成
种间联结
生态位
群落稳定性
Keteleeria evelyniana forest
community composition
interspecific associations
niches
community stability
