Research On Diversity Distribution And Spatial Heterogeneity Of Main Tree Species In Northeast Forest Region

Diversity of trees in the northeast forest has obvious nonlinear trend latitudinal and longitudal with single peak.In N44?N45 area,community diversity index got the maximum value in 600?900 altitudes,the lowest value above 1500 m altitude.The diversity of the trees in different slopes is significant.Shady slope diversity index showed a trend of obvious "unimodal" with latitude and sunny slope diversity index distribution varies with latitude showed a trend of obvious "U" type.Sunny slope trees showed a "S' type in diameter grades distribution,tending to normal distribution."J" type was the diameter grades distribution in shady slope trees.There was no significant difference in half heliophilic and half shaded slope trees.Among Birches,linden trees,utilize modern Mongolian oak forest,deciduous significant difference was found in species diversity and species distribution of average metabolic rate range difference were markedly,but the diameter class distribution structure similar to that of community structure stability has a certain similarity degree.In potential distribution area of 26 kinds of main tree species,there is obvious difference in slope,and roughly divided into sunny slope appropriate tree species,shady slope appropriate tree species,no obvious slope appropriate tree species.Tall mountain ridge lines are often the most important factor in the optimal distribution of tree species,especially the great xinganling mountains.The different slopes of Changbai Mountain and the southern tip of daxing anling are the most suitable distribution areas of multiple species of tree species.