甘肃小陇山锐齿栎林主要种群生态位的研究

以Levins和Shannon-Wiener生态位宽度和Pianka重叠指数对甘肃小陇山锐齿栎林的10个主要种群生态位宽度和生态位重叠及生态相似性进行了研究,分析了生态位宽度和生态位重叠的关系,揭示了各种群在群落中的功能地位及其生态适应性．得出了:(1)研究区主要树种的生态位宽度BL:大小依次为锐齿栎、红果钓樟、椴树、椋子木、华山松、鹅耳枥、四照花、白桦、漆树、元宝槭．BSW值顺序则为锐齿栎、椴树、红果钓樟、鹅耳枥、椋子木、华山松、漆树、四照花、白桦、元宝槭．(2)生态位重叠指数大于0．4的共有12对,占26．67％,说明生态位重叠的程度不是很高,生态位重叠最大值发生在鹅耳枥和元宝槭间,为0．736 3．(3)生态位相似性比例大于0．5的只有2对,表明群落内物种对资源利用相似性程度比较低．

Study on niche of main population of Quercus aliena var.acuteserrata forest on the Mt.Xiaolongshan in Gansu Province

The niche breadth,niche overlaps and niche similarity of 10 main trees species in the Mt. Xi-aolong in Gansu Province were measured by the Levins,Shannon-Wiener niche breadth formula, niche overlaps index by Pianka,and the relationship between the niche breadth,niche overlaps and niche similarity, and the capability of adapting environment of the main trees population were analyzed in this paper. The results showed as the follows: (1) The niche breadth of 10 species in BL order was Quercus aliena var. acuteseratc>Lindera erythrocarpa>Tilia tuan>Swida macrophylla>Pinus armandii>Carpinus turc-zaninowii>Dendrobenthamia japonica var. chinensis>Betula platyphylla>Rhus verniciflus>Acer truncatum. The niche breadth in BSW order were Quercus aliena var. acuteserata>Tilia tuan>Lindera erythrocarpa>Carpinus turczaninowii>Swida macrophylla>Pinus armandii>Rhus verniciflus>Dendrobenthamia japonica var. chinensis>Betula platyphylla>Acer truncatum; (2) There were 12 pairs which niche overlaps were higher than 0.4, accounting for 26.67 %, which showed that the degree of niche overlaps was not very high,the max of niche overlaps was between Carpinus turczaninowii and Acer. truncatum, with index of 0.736 3;(3)The rate of niche similarity higher than 0.5 were two pairs,which showed that the similarity degree of tree species of resources utilization in the community was lower.