【摘要】 以Levins和Shannon-Wiener生态位宽度及Pianka重叠指数为依据,将土壤有机质、土壤pH值、土壤全N分别作为反映各主要种群生长环境的资源轴,对小陇山锐齿栎林的10个主要种群生态位宽度和生态位重叠进行了研究.结果表明,各主要种群在3个资源轴上的生态位宽度均较大,生态位宽度平均最大值出现在有机质资源维上,平均最小值出现在全N资源维上;各主要种群在3个资源维上的重叠都较大,说明了各主要树种间利用资源的方式较为相似,表明种群间利用资源的竞争排斥作用较为强烈,彼此之间容易造成在各资源维上的竞争;在3组资源轴中,锐齿栎的生态位宽度均为最大,说明锐齿栎种群对各资源的利用充分,适应性强.更多还原

【Abstract】 The niche breadth,and niche overlaps of 10 main trees species in the Mountain Xiaolong in Gansu were measured using the formula proposed by Levins,Shannon-Wiener and Pianka.Organic matter,pH and total nitrogen were used as the resource axis to reflect the growing environment of Quercus aliena var.acuteserata forest.The results showed as the follow:the niche breadth of main population in three resource axis are breader,average maximum appears on organic matter resource axis,and average minimum appears on total N resource axis.The niche overlaps of main population in three resource axis relatively bigger,and the way to utilize resource is comparatively similar,which indicate population competition of resource comparatively is strong,so apt to cause the competition on every resource each other.Among three group resource axis,the niche width of Quercus aliena var.acuteserata is the largest,proved that Quercus aliena var.acuteserata is abundant in use every resource and have a good adaptability.更多还原