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以华北落叶松和青杆为主的寒温性针叶林是庞泉沟自然保护区的重要林型,也是主要保护对象之一。通过空间代时间构建庞泉沟自然保护区寒温性针叶林演替的时间序列,序列1是华北落叶松单优群落稳定发展的过程,序列2是从华北落叶松单优群落演替至华北落叶松-青杆共优群落再到青杆单优群落的过程,采用点格局分析法和与Monte-Carlo拟合检验对演替过程中华北落叶松和青杆的分布格局及其相互关系进行了研究。结果表明:(1)序列1在华北落叶松单优群落稳定发展过程中,华北落叶松的分布格局由集群分布趋向于随机分布,甚至在0—2.5 m上表现为均匀分布,驱动力是种内竞争引起的自疏现象。序列2从华北落叶松单优群落演替至青杆单优群落过程中,华北落叶松的分布格局同样是由集群分布趋向于随机分布,驱动力主要来自于由于青杄侵入扩散而形成的种间竞争;青杄集群的尺度逐步增大,驱动力主要是种群拓殖和种内竞争。(2)二者种间关系,在华北落叶松单优群落阶段无明显相关,共优阶段由于竞争在0—6.5 m尺度上呈显著正相关,在青杄单优群落,青杄竞争获胜,在0—2.5 m尺度上无明显相关,二者种间关系的变化主要来自于群落剩余资源驱动下的种内种间竞争。
Cold-temperate coniferous forest dominated by Larix principis-rupprechtii and green stem is one of the main protected objects in Pangquangou Nature Reserve. Sequence 1 is the process of stable development of single dominant community of Larix principis-rupprechtii, sequence 2 is from succession of single-dominant community of Larix principis-rupprechtii North Larix principis-rupprechtii, and then to the single-superior community of P. ramosissima. The distribution patterns and their relations of Larix principis-rupprechtii and P. sibirica in the succession process were studied by using point pattern analysis and Monte-Carlo fitting test Were studied. The results showed as follows: (1) During the stable development of single dominant community of Larix principis-rupprechtii in the sequence 1, the distribution pattern of Larix principis-rupprechtii tends to be randomly distributed by the cluster, even distributed uniformly in 0-2.5 m with the driving force being the species The phenomenon of self-spill caused by the competition. Sequence 2 From the single succession community of Larix principis-rupprechtii to the single-superior community, the distribution pattern of Larix principis-rupprechtii tends to be randomly distributed by the cluster, and the driving force comes mainly from the species Between the competition; barley cluster scale gradually increased, the driving force is mainly population colonization and intraspecific competition. (2) There was no significant correlation between the two species in the single optimal community stage of Larix principis-rupprechtii, because the competition was significantly positive in 0-6.5 m scale, There was no significant correlation between 0-2.5 m scale, and the change of the relationship between the two species mainly came from species interspecific competition driven by community surplus resources.