海南特有种东方琼楠种群结构特征

Population structure of endemic species Beilschmiedia tungfangensis in Hainan of South China

为探讨海南特有种东方琼楠(Beilschmiedia tungfangensis)种群结构特征,在海南尖峰岭林区设置20.4hm2样地,从种群径级结构、静态生命表、存活曲线、空间分布格局等方面进行分析。结果表明:1)东方琼楠种群径级分布呈倒"J"型,为增长型种群;2)在第Ⅲ级(DBH:10～15cm)时生命期望值最高,向大龄级和小龄级呈递减趋势;3)存活曲线接近DeeveyⅢ型,呈凹型;死亡率曲线和消失率曲线呈"V"型;4)不同分析方法均表明该种群呈聚集分布,且聚群强度较大;5)聚块性指数随径级呈"正余弦"变化。

To approach the characteristics of endemic species Beilschmiedia tung）angensts popma- tion structure in Hainan, a 20.4-hm2 experimental site was installed in Jianfengling forest region of Hainan, with the population diameter structure, static life table, survival curve, and spatial distribution pattern analyzed. The diameter class distribution of the B. tungfangensis population showed a reverse ＂J＂ type, suggesting that this population was of increasing type. The life expectancy was the highest at the third stage （DBH： 10-15 cm）, and showed a decreasing trend to both the big and the small age classes. The survival curve was a concave one, similar to Dee^ey type III, whereas the mortality rate curve and hazard rate curve showed ＂V＂ type. The analyses with different methods all showed that the spatial distribution pattern of the B. tungfan- gemris population tended to be aggregated, and the aggregation intensity was strong. The patchi- ness index showed ＂sine or cosine＂ curve with diameter class.