不同恢复类型木荷马尾松林优势种群空间分布格局分析

On Spatial Distribution Pattern in Different Restoration Processes of Dominant Populations in Schima superba and Pinus massoniana Forest

应用5项聚集度指标对不同恢复类型木荷马尾松林乔、灌木层优势种群的分布格局进行了测定.研究结果表明：经过一段时间的自然恢复,一些地带性物种已侵入群落,但仅局限于部分样方内,群落目前处于中亚热带植被演替系列的前期,群落结构较脆弱.在乔木层中,只第一、三类型的木荷,第三类型的台湾相思及第四类型的青冈等种群的各项指标测定结果一致,都呈聚集分布,表现出一般的种群分布格局.马尾松和杉木则都呈均匀分布,保持着人工干扰的结果;灌木层中木荷幼苗幼树的M/x先升后降,在一定程度上反映出随着乔木层物种组成的改变,种间竞争加剧,生长环境条件的改变使木荷的聚集强度逐渐降低.

To measure the spatial distribution pattern in different restoration processes of dominant populations of Schima superba and Pinus massoniana forest by using 5 aggregated indices. The results show that：after several decades of natural reforestation, some local trees had invaded the communities but they were very less, now the communities are in the middle of succession series of mid-subtropical vegetation, and the configurations of communities are fragile. In tree layer,only the patterns of Schima superba in NO. 1,3 successional series,Acacia confusa in NO. 3 successional series and Cyclobalanopsis glauca in NO. 4 successional series were cluster,and Pinus massoniana and Cunningharaia lanceolata were random as the result of artificial effect. The change rhythm of M/x of Schima superba in shrub layer was increasing and then reducing, these reflected that when the populations in tree layer changed, populations in the forest competed vehemently with each others,the aggregated intensity of sapling Schima superba decreased because of the change of yield conditions.