青岛沿海地区是山茶在中国分布的最北界。长门岩岛是该地区山茶的主要分布地。岛上的山茶集中分布在海拔20～80m的范围内，植株的胸径为2～45cm，高度0.4～4.5m。由生命表可以看出，属于小个体级与大个体级的数目较少，大多数个体处于中级水平。从大小金字塔看，它属于Bodenheimer所述的下降型种群。存活曲线图表明，小个体级的死亡率较高。应用泊松分布、负二项分布和奈曼分布3种理论分布模型，进行了分布格局的研究，结果表明，该种群的实际频数符合负二项分布，由此判定种群的分布格局为聚集分布。通过对种群的聚集强度指数的计算，求得各参数分别为二项参数(K)0.6291，扩散系数(C)17.7372，丛生指标(I)16.7372，Cassie指标(1/K)1.5896，聚块性指标为(m*/m)2.5896，均表明为强聚集分布。
We investigated the statistic characteristic of the Camellia japonica population in the Changmenyan Island where is the north distribution boundary of the species. The species was mainly distributed from 20 to 80m a. b. 1.The diameter of the individuals was from 2 to 45cm, and the height of the trees was from 0. 4 to 4.5m. The life table shows that the majority of the individuals were those of middle size. The survivorship curve indicates that the mortality is high at the younger stage than in others. The size distribution pattern was of the Ⅲ type of Bodenheimer’s. Three theoretical models, Poisson, Negative Binomial Distribution and Neyman were used to investigate the spatial pattern of the population. The results indicate that the population spatial patterns had high consistency with the Binomial Distribution. Therefore the spatial pattern of the population was of contagious distribution. The indexes are: K =0. 6219, C=17. 7327, I=16. 7327, 1/K=I. 5896, m*/m=2. 5896.
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