Intraspecific and Interspecific Competitions of the Three Hardwood Tree species in Northeast China
In order to analyze the competitive relationships among the three hardwood tree species in northeast China,a sample plot of secondary broad-leaved mixed forest with an area of 1 hm2 was set in Heilongjiang Grand Canyon National Nature Reserve. The DBH greater than 5 cm,species,and coordinates of all trees in the sample plot were measured,and the competition intensity was calculated by Hegyi competition index algorithm to examine the relationship between the competition intensity and DBH of three tree species. It provides strong support for the protection of three hardwood tree species in northeast China. The results showed that in the competition between the subject trees and competing trees,the intraspecific,interspecific and average competition intensity of the tree species decreased with the increase of DBH,and the competition intensity was positively correlated with the number of subject trees. The intraspecific competition index,interspecific competition index and total competition index increased with the increase of the number of subject trees. In the competition of the three hardwood tree species,except for the Fraxinus mandshurica,Juglans mandshurica and Phellodendron amurense were the most intense intraspecific competition,and the relationships between the DBH of the subject trees and the competition indexes (intraspecific,interspecific and total) were the power function relationship.
competition intensitythree hardwood tree speciesintraspecific competitioninterspecific competitionDBH
万方数据
维普
