特有珍稀植物宝华玉兰种群分布格局和群落特征

采用相邻格子样方法和典型样地法研究镇江宝华山国家森林公园珍稀植物宝华玉兰的种群分布格局和群落物种多样性。从分布格局看,宝华玉兰种群在半自然样地Q1中为聚集分布,但聚集强度不高,而在另外3个样地中均为随机分布。从群落特征看,4个样地共有维管植物89种,隶属于43科74属;群落分层明显,但宝华玉兰为亚优势种;半自然林中各层次的物种多样性Shannon-Wiener指数为草本层>灌木层>乔木层,而在自然样地中,则为草本层>乔木层>灌木层。

Population pattern and community characteristics of endemic and rare plant Magnolia zenii in Baohuashan National Forest Park

By applying the contiguous grid quadrats and typical plots,it had been studied about the population pattern and species diversity of the communities Magnolia zenii Cheng in Baohuashan National Forest Park in Zhenjiang City.Based on analyzing the spatial pattern,it was shown that only its semi-nature population Q1 was of contagious distribution type while the other three populations(Q2,Q3,Q4)were of random distribution types.As far as the characters of the communities were concerned,there were 89 species of vascular plants belonging to 43 families and 74 genera in the four plots.M.zenii was sub-dominant species in the communities,which could be divided into three distinct layers:tree,shrub,and herb layers.The result showed that the Shannon-Wiener index diversity order of different layers was herb layer>shrub layer>tree layer in the semi-nature communities,while in the natural communities,it was herb layer>tree layer>shrub layer accordingly.