福建君子峰国家级自然保护区观光木种内与种间竞争

Intra-specific and Inter-specific Competition of Tsoongiodendron odorum in the Junzifeng National Nature Reserve of Fujian Province

为了探讨观光木天然群落树种之间的竞争关系与动态规律,于2021年7—8月在福建君子峰国家级自然保护区对设置的6个观光木群落典型样地进行调查,并运用Hegyi单木竞争模型对福建君子峰国家级自然保护区观光木群落的52株对象木及686株伴生竞争木的种内及种间竞争指数进行分析,同时利用回归分析法对对象木和林分、种间竞争强度建立相关函数模型。结果表明:观光木的种内、种间竞争指数分别为302.60、501.26,分别占比37.64%、62.36%,说明竞争主要来源于种间。观光木的伴生树种(86种)较多,观光木与主要伴生树种的竞争大小排序为赤杨叶>丝栗栲>米槠>桂北木姜子>木荷>浙江润楠>庆元冬青>樟叶泡花树>鹿角锥。竞争强度随着观光木胸径的增大而下降,当观光木的胸径达到30 cm及以上时,竞争强度的变化幅度减小,并趋近于平稳;竞争强度与胸径两者之间满足幂函数关系(CI=aD^(b)),观光木的种内与种间竞争强度可用此模型进行较准确预测。生产中可根据模型预测的结果,当观光木的胸径小于30 cm时,采用修枝、择伐等手段对影响观光木生长的伴生树种进行适当处理,以调节对象木与竞争木的种间关系,更好地保护观光木天然种群。

In order to explore the competitive relationship and dynamic patterns among natural tree species in Tsoongiodendron odorum community,a survey was conducted on 6 typical plots of Tsoongiodendron odorum communities from July to August 2021 in the Junzifeng National Nature Reserve of Fujian.The Hegyi competition model was used to analyze the intra-species and inter-species competition indices of 52 objective trees and 686 accompanying competing trees in the Tsoongiodendron odorum community of the Junzifeng National Nature Reserve of Fujian,at the same time,regression analysis was used to establish a correlation function model for the competition intensity between the target trees,stands,and species.The results showed that the intra-species and inter-species competition indices of Tsoongiodendron odorum were 37.64%and 62.36%,respectively,indicating that competition mainly comes from inter-species.There were many accompanying tree species of Tsoongiodendron odorum and the order of competition between Tsoongiodendron odorum and the main accompanying tree species was as follows:Alniphyllum fortunei>Castanopsis fargesii>Castanopsis carlesii>Litsea subcoriacea>Schima superba>Machilus chekiangensis>Quercus pachyloma>Ilex qingyuanensis>Meliosma squamulata>Castanopsis lamontii.The competition intensity decreases with the increase of the DBH of objective trees.When the DBH of objective trees were more than 30 cm,the change in competition intensity was small and tends to be stable.The relationship between competition intensity and DBH accords with a power function(CI=aD^(b)),and the intra and inter-species competition intensity of objective trees can be accurately predicted using corresponding models.According to the results predicted by the model,when the diameter at breast height of the objective tree was less than 30 cm,appropriate treatments such as pruning and selective cutting can be used to adjust the interspecific relationship between the objective trees and the competitive trees,which was beneficial for better protecting the competitive tree species.