新疆喀纳斯旅游区森林群落格局分析及其环境解释

Pattern Analysis and Environment Interpretation on Forest Community in Kanas Tourist Areas,Xinjiang

运用除趋势典范对应分析(DCCA)对影响新疆喀纳斯旅游区森林群落分布格局的地形因子和土壤因子进行了研究。结果表明,①DCCA排序将喀纳斯森林群落划分为9个类型;②DCCA排序第一轴与坡度、土壤含水量、有机质、碱解氮、速效钾和pH值显著相关,第二轴主要与海拔、坡位、土壤温度、土壤含水量和土壤容重相关,但是对森林群落分布格局起决定作用的环境因子是土壤含水量、有机质、坡度、碱解氮和海拔;③地形因子和土壤因子共解释了喀纳斯森林植被分布格局变异的79.41%,其中:地形因子为12.50%,土壤因子为48.53%,地形因子和土壤因子交互作用为18.38%,地形因子和土壤因子未能解释的部分为20.59%。未能解释的部分可能与火干扰相关,有待于进一步研究。

The influence of topographical factors and edaphic factors on the distribution pattern of forest communities in Kanas tourist areas in Xinjiang was studied by using detrended canonical correspondence analysis（DCCA）.The results showed that ①Nine types were identified from forest communities in Kanas;②The first DCCA axle had distinct relationships with slope,soil water content,organic matter content,available N,available K and pH.In addition,the second one was mainly related to elevation,location,soil temperature and soil density.However,the most important factors for the forest communities were soil water content,organic matter content,slope,available N and elevation;③Topographical and edaphic variation accounted for 79.41% of distribution pattern of forest vegetation,of which topographical factors alone accounted for 12.50%,edaphic factors were 48.53%,and the interaction effect of topographical and edaphic factors were 18.38%.In addition,20.59% of distribution pattern was undetermined.At last,it is possible that the undetermined fraction is related to fire interference,which remained to be studied in future.