杉木与火力楠人工混交林群落空间格局研究

Spatial Pattern of Artificial Mixed Forest of Cunninghamia lanceolata and Michelia macclurei

运用空间点格局分析方法对广西大青山实验场杉木-火力楠人工混交林群落进行研究,对群落内主要木本植物种群的空间分布格局和主要种群的种间关联进行了分析。结果表明:在1~20 m尺度范围内,该群落中木本植物大体上服从聚集分布,随尺度增加聚集分布减弱。群落内的6个主要种群,除火力楠与大叶山楝接近随机分布外,其他种群皆大致服从聚集分布,以黄椿木姜子和中平树聚集程度最强。样地内大树和小树之间不存在相关关系,而小树与幼树、大树与幼树之间在大尺度范围内相互独立,在小尺度范围内以正关联为主。该群落内主要种群之间以无关联和负关联为主,只存在少量正关联,杉木-火力楠人工混交林群落结构尚不稳定。

The spatial point pattern analysis method was used to study the artificial mixed forest of Cunninghamia lanceolata and Michelia macclurei in the Daqingshan experimental field in Guangxi,and analyzed the spatial distribution pattern of the dominant woody plant populations and the interspecific association among dominant populations in the community.The results showed that in the scale of 1-20 m,the woody plants in this community generally follow the aggregation distribution,and the aggregation distribution decreases with increase of scale.Among the 6 dominant populations in the community,except for the random distribution of M.macclurei and Aphanamixis grandifolia,other populations were generally subject to aggregate distribution,with the highest aggregation of Litsea variabilis and Macaranga denticulata.In the plot,the big tree and the small tree are independent of each other,while the small tree and the young tree,the big tree and the young tree have a positive correlation in a small scale range,and there is no correlation in a large scale range.There is no correlation and negative correlation among the dominant populations in this community,only a small number of positive associations exist,and the community structure of artificial mixed forest of C.lanceolata and M.macclurei is still unstable.