五龙洞国家森林公园太白杨林优势种群生态位

Niche of Dominant Species in Populus purdomii Community in Wulongdong National Forest Park

采用Shannon-Wiener生态位宽度指数、生态位重叠指数(Lih、Lhi)和生态位相似比例,对陕西略阳五龙洞国家森林公园太白杨群落进行研究。结果表明,太白杨群落生态位宽度排列顺序为太白杨>鹅耳枥>牛皮桦>华山松>铁木>灯台树>三桠乌药>五角枫>锐齿栎>红桦;生态位重叠指数(Lih、Lhi)大于0.03的种对有64对,占总数的71.1%;生态位相似性比例在0.3以上的种对有31对,占总数的68.9%。表明群落优势种之间生态位具有相当程度的重叠,各优势树种对资源的利用相似程度较大。

Using Shannon-Wiener niche breadth index,niche overlap index（Lih,Lhi）and niche similarity proportion,this article carried research on Populus purdomii community in Wulongdong National Forest Park in Shaanxi.Results showed that： the niche breadth in Populus purdomii community was decreased in the order of Populus purdomii Carpinus turczaninowii Betula utilis Pinus armandi Ostrya japonica Cornus controversa Lindera obtusiloba Acer truncatum Quercus aliena BI.var.acuteserrata Betula albo-sinensis;the species with niche overlap index（Lih,Lhi）above 0.03 reached 64,accounting for 71.1% in total;the species with niche similarity proportion above 0.3 reached 31,accounting for 68.9% in total.These data indicated that there were considerable degree of niche overlap between dominant species in Populus purdomii community,and dominant species had a bigger similarity proportion in using resource.