洛阳市嵩县九龙瀑优势种种间空间相关性及密度制约效应

The spatial association between dominant species and density-dependent effect in Jiulongpu of Song County,Luoyang City

使用成对相关函数g(r)对洛阳市九龙瀑1 hm2样地内的优势种锐齿槲栎(Quercus aliena var.acutiserrata)、短柄枹栎(Quercus serrata var.Brevipetiolata)和连翘(Forsythia suspensa)的种内和种间空间相关性以及密度制约效应进行研究。结果表明,排除生境异质性后发现,其他物种对锐齿槲栎的影响并不显著,对短柄枹栎和连翘以负相关为主,但3者对其他物种均有显著的负相关。而其小树受到大树种内的正相关也在一定程度上增加了小树的存活率,缓解了锐齿槲栎、短柄枹栎和连翘的更新困难。此外,锐齿槲栎和短柄枹栎受到一定程度的负密度制约效应影响。综上所述,适宜的生境和种内、种间存在的正的空间相关性共同作用保证了锐齿槲栎、短柄枹栎和连翘在本地的优势地位。

The pair-correlation function g（r） was used to study the spatial corrlation and density dependent effects within and between the dominant species（Quercus aliena var. acutiserrata,Quercus serrata var. brevipetiolata and Forsythia suspensa） of a 1 hm^2 plot in Jiulongpu of Luoyang City. The results show that with the exclusion of habitat heterogeneity in the study plot,the overall effect of other species of Quercus aliena var. acuteserrata was not significant,but the negative association was found between Quercus serrata var.brevipetiolatara var. Brevipetiolata and Forsythia suspensa. However,all three species had a significant negative association with other species. The positive association between the small tree and the large tree species also increases the survival rate of the small trees to a certain extent,relieves the difficulty of rejuvenation of Quercus aliena var. acutiserrata,Quercus serrata var. brevipetiolata and Forsythia suspense. In addition,Quercus aliena var. acutiserrata and Quercus serrata var. brevipetiolata are affected by a certain degree of negative density-dependent effects. In summary,the combination of suitable habitats and intraspecific and interspecific positive spatial association ensures the superiority of Quercus aliena var. acutiserrata,Quercus serrata var. brevipetiolata and Forsythia suspensa in the local area.