【摘要】 根据福建省寿宁县天然黄山松种群个体定位图,运用扩散系数(C)、负二项参数(K)、Cassie.R.M.指标(Ca)、平均拥挤度(m*)、聚块性指数(m*/m)和扩散型指数(Iδ)6种聚集度指标,考察黄山松种群在不同取样尺度上及不同发育阶段分布格局的变化。结果表明:种群空间分布格局随取样尺度的不同而发生变化,样方大小对黄山松种群分布格局的测定结果具有显著影响,其分布格局测定的样方面积不应小于16 m2,样方大于或等于16 m2时,黄山松种群表现为集群分布类型;不同取样尺度下,种群反映出不同的聚集程度,扩散型指标Iδ基本上随取样尺度的增大而减小;不同发育阶段的黄山松种群均表现为集群分布,且大树阶段的聚集程度最大,幼树阶段次之,中径树阶段最小。更多还原

【Abstract】 By applying six aggregation indices,C,K,Ca,m,m/m and Iδ,the changes of distribution pattern of natural Pinus taiwanensis population in Shouning County with the different sampling scales and different development stages were examined according to the map of individual location.The results indicated that quadrat size had a notable effect on measurement result of spatial distribution pattern of Pinus taiwanensis population.The study showed that the quadrat size should not be less than 16 m2 in measurement of distribution pattern of Pinus taiwanensis population.Pinus taiwanensis population took on clumped distribution with no less than 16 m2 sampling scale.Values of dispersion index I of the population decreased with increment of sampling scale as reflected the measured degree of aggregation of the population varied with sampling scale.Clumped distribution appeared at all the development stages of the population.And degree of aggregation of the population at the large tree stage was maximum,second place at the sapling stage,and minimum at the middle tree stage.更多还原