木林子国家级自然保护区大样地四照花种群空间分布格局研究

Spatial Distribution Pattern of Dendrobenthamia japonica(DC.)Fang Population in Mulinzi National Nature Reserve

采用点格局分析法对湖北木林子国家级自然保护区大样地的主要优势种群四照花进行了空间分布格局研究,同时计算了其种群分布与5项环境因子的相关系数.结果发现,四照花种群在中小尺度上呈聚集分布,且聚集强度随尺度增加而波动,在大尺度上经随机分布递变为均匀分布;随种群年龄的增加,种群个体间正相关性逐渐下降,种群聚集度随之下降,且年龄差距越大的个体间,空间负相关性越高;在研究尺度范围内,四照花种群与川陕鹅耳枥和石灰花楸两种群呈显著空间正相关,与小叶青冈种群呈显著负相关;四照花种群的空间分布与海拔、凸度、坡度、土壤p H值4项环境因子的相关性呈极显著,而与坡向无关.

The Dendrobenthamia japonica （DC.） Fang population, the dominant species of the forest dy-namics plot in Mulinzi National Nature Reserve of Hubei Province,was studied in this article. Its point pattern and pearson correlation with some environmental factors around it was researched and calculated. The results are as follows：This population obeys an aggregated distribution in meso-and micro-scale and its aggregation intensity fluctuates to a certain degree,but its spatial pattern changes from a random distri-bution to an regular distribution.The positive correlation property between the individuals declines with the age of the population, which leads to the declining of the aggregation intensity.What′s more,the bigger the age gap is,the more outstanding the negative correlation is. The spatial correlation between the Den-drobenthamia japonica （DC.） Fang population with the Carpinus fargesiana H. Winkl. population and the Sorbus folgneri （ Schneid.） Rehd. Population is positive and outsanding, while with the Cyclobalanopsis myrsinaefolia （Blume） Oerst. population is negative and outsanding.Finally,we also find that the distribu-tion of the Dendrobenthamia japonica （DC.） Fang population is influenced by some environmental factors including the elevation,the convexity,the gradient,the pH of soil,but not by the slope aspect.