子午岭油松林灌木层主要树种的空间分布格局和种间关联性研究

对子午岭油松林的主要物种进行实地调查,并根据林下灌木层各物种的重要值确定主要树种,然后用聚集强度指数、x2值和关联度指数对林下灌木层主要树种的空间分布格局和种间关联性进行分析.结果显示:(1)13个主要树种中除辽东栎的K值和CA值小于0外,其余种群皆表现为K>0,C>1,CA>0,I>0,m*/m>0;(2)x2检验显示,大多数树种种间关联性不显著;(3)种间关联度分析显示,树种呈正联结的共计36对,呈负联结的也有36对,有6对是关联强度低的种对.结果表明,在子午岭油松林中辽东栎与其它树种相比,具有广泛均匀分布的倾向,与其它树种之间存在强烈的竞争关系,辽东栎树种具有一定的种间竞争扩张优势.

Spatial Distribution Pattern and Interspecific Association of Main Tree Species in Pinus tabulaeformis Forest in Ziwuling Mountains

The main tree speices of Pinus tableformis forest in Ziwuling Mountains were inventoried.13 tree species were selected based on the important value.And the data was analyzed by spatial distribution index and x2 and interspecific association index.The results showed that for all main tree species K>0,C>1,CA>0,I>0,m/m>0,but Quercus liaotungensis K<0,CA <0;The results of x2 test showed that most tree species have indistinctive association.The interspecific association analysis indicated that there were 36 pairs of positive associations and 36 pairs of negative associations and 6 pairs of infirm associations.The results showed Quercus liaotungensis had widespread tendency and intensive competition in Ziwuling Mountains.