山西省庞泉沟地区华北落叶松种群空间分布格局

在庞泉沟自然保护区设置30 m×30 m样地10块,应用相邻格子法进行每木调查,并对华北落叶松种群结构和分布格局进行了分析.结果表明,华北落叶松种群年龄结构为稳定型,幼苗、幼树的后备资源储备量大;取样尺度为5 m×5 m时,华北落叶松种群属于随机分布,随着取样尺度的增大,种群为集群分布,取样尺度为25 m×25 m时,聚集强度较大;在低海拔(1 950~2 050 m)及阳坡,集群分布为华北落叶松种群分布的主要特征,聚集强度较大;而在中高海拔(2 050~2 250 m)及阴坡,华北落叶松种群趋向随机分布,聚集强度减弱.

Pattern of spatial population of Larix principis-rupprechtii in Pangquangou Region,Shanxi Province,northern China.

Ten plots with the size of 30 m×30 m were established in Pangquangou Nature Reserve,Shanxi Province,in order to obtain the sampling data by tally in the contiguous quadrats.Through the dynamic analysis of Larix principis-rupprechtii population structure and distribution pattern,the results showed that: the age structure was stable and the resources of little and young trees were rich;L.principis-rupprechtii population presented an random distribution when the sample size was 5 m×5 m and was cluster distribution pattern in large spatial scales with its high aggregating intensity occurring with the sample size of 25 m×25 m;L.principis-rupprechtii population was cluster distribution pattern within the altitude of(1 950-2 050 m) and on southward-facing slopes,where the aggregating intensity of the population was high. L.principis-rupprechtii population presented an random distribution within the altitude of(2 050——2 250 m) and on northwardfacing slopes,where the aggregating intensity of the population was low.