伏牛山油松群落格局与动态研究

Study on spatial pattern and community dynamics of Pinus tabulaeformis in Funiu Mountains

利用种群径级结构代替年龄结构、点格局分析（Ripley K函数）方法对油松种群年龄结构、空间分布以及油松和麻栎的种间关系进行了研究．结果表明：纯林样地中油松种群多为中龄林，径级结构多在15～30ｃm群落为稳定型；油松一麻栎混交林群落中，油松为中幼林，径级结构多在15～20cm，油松种群为增长型，麻栎油松为中龄林，径级结构多在15～25cm，种群为稳定型．对比油松纯林和油松一麻栎混交林中油松的空闻格局显示：纯林在4～5m趋于聚集分布，之后随尺度进一步变大又趋于均匀分布；混交林中油松的分布与纯林相比，更多的趋向于均匀分布．研究还通过对不同群落中油松不同径级之间的关联性进行分析，进一步证明伏牛山油松麻栎混交林群落稳定性比油松纯林更高，且麻栎的存在一定程度上促进了混交林中油松种群的发展．

Using diameter class structure in place of age structure, method of point pattern analysis （Ripley K） a study was conducted on the spatial distribution pattern, the relationships between P. tabulaeformis and Q. acutissima species, and P. tabulaeformis population age structure. The results indicated that the pure P. tabulaeformis populations are most middle-aged forest. The diameter struc- ture is mostly between 15 ～30 cm and the community is stable. In mixed forest the P. tabulaeformis population is the growth form and the diameter structure is mostly between 15 ～20 cm. Meanwhile the Q. acutissima population is stable and the diameter structure is mostly between 15 ～ 25 cm. Compared with the mixed forest, pure P. tabulaeformis forest species tend to be aggregated distribution between 4 ～5 meters, and then tend to be uniform distribution gradually. At the same time, P. tabulaeformis population tend to be uniform distribution, as is in mixed forest. Through analyzing the relavancy of P. tabulaeformis between different diameter grades, it is proved that the community of P. tabulaeformis and Quercus acutissima mixed forest is more stable. Q. acutissima population promote the development and stability of P. tabulaeformis population to some extent.