溧水东庐山麻栎种群结构与分布格局研究

Population structure and spatial distribution pattern of Quercus acutissima in Donglu Mountain of Lishui,Nanjing

采用样方调查法对南京溧水东庐山麻栎种群结构和分布格局进行了研究。结果表明:(1)麻栎种群的年龄结构呈现偏态性,Ⅰ级幼苗数量较少,Ⅱ级幼苗贮备不足,年龄结构为衰退型;(2)静态生命表中,Ⅰ、Ⅱ龄级的死亡率为负值,而Ⅶ、Ⅸ龄级的死亡率最大,种群生命期望随龄级增加依次递减。(3)种群大小结构表现为中龄、大树所占比例较多,而幼树及老龄个体数量都较少,存活曲线呈现衰退型种群的变化特征。(4)利用负二项参数(K)、扩散系数(C)、扩散型指数(I_δ)、Cassie指标(C_a)、丛生指数(I)、聚块性指标(m*/m)等指标对种群的空间格局进行分析,表明麻栎种群的空间分布格局为集群分布。

By means of quadrate investigation,the structure and distribution pattern of Quercus acutissima population from Donglu Mountain of Lishui in Nanjing were studied. The results showed that（ 1） The size,class structure of Quercus acutissima population was in skewed distribution,the number of Class Ⅰseedlings was less,and ClassⅡseedlings was lack,suggesting senescence in age structure of Q. acutissima.（ 2） Judged from the static life of Q. acutissima population,the mortality of ClassⅠand Ⅱ was negative,and that of Class Ⅶ and Ⅸ was the most. And with the age＇s increase,the life expectation（ e_x） of populations declined.（ 3） The population structure was featured with larger proportion of middle-aged and bigger trees,but with less proportion of seedlings and older trees,the survival curve showed a decline trend.（ 4） The spatial pattern of sampling plots showed aggregative distribution through testing cluster-intensity coefficient for instance K-value of negative binomial,dispersal index（ C）,index of dispersion pattern（ I_δ）,Cassie index（ C_a）,clumping index（ I） and index of patchiness（ m＊/ m）.