Niches,Interspecific Associations and Community Stability of Dominant Tree Species of Picea koraiensis-Abies nephrolepis-Pinus koraiensis Forest
The fixed monitoring plot was conducted in the Xilinhe National Nature Reserve to analyze tree species diversity,dominant species niche,interspecific associations and community stability in the Picea koraiensis-Abies nephrolepis-Pinus koraiensis forest community by using a series of analysis methods including the α diversity index,the niche determination,the variance ratio(VR),the Chi-square test(χ2 test),the Spearman's rank correlation coefficient test and the M.Godron stability.The results showed that:(1)the plot encompassed 20 tree species,14 families and 14 genera,with a balanced distribution of trees,and the α diversity index was high;(2)the community niche overlap index was relatively high,but the cases with large(>0.7)or small(<0.4)niche overlap index were rare with a moderate degree of niche differentiation;(3)the overall correlation of the community was nonsignificant positive,and the interspecific correlations among the main tree species were mainly positive and nonsignificant correlation with strong interspecific independence;(4)the stability of M.Godron analysis fell to the point(32.79,67.21)and was far from the stable point(20,80),indicating poor community stability;(5)P.koraiensis had the highest importance value and niche width in the sample plot,the average niche overlap index with other tree species was higher than the average value of the sample plot;the species was dominated by large-diameter individuals,and the relative frequency among tree species was low.Therefore,during the restoration process of Picea koraiensis-Abies nephrolepis-Pinus koraiensis forest,the appropriate artificial intervention should be carried out to promote the recovery of Pinus koraiensis population,to regulate interspecies relationships,to enhance interspecies association strength,and to strengthen monitoring and protection of rare plant populations when community stability declined.
万方数据
维普
