Study On Dynamics Of Structure In Artificial And Natural Mixed Forests In Changbai Mountains

The purpose of this study is from the plantation natural perspective, analysis Changbai Mountain artificial larch forest structure characteristics, Artificial Larch understanding of the Changbai Mountains mixed with natural spruce, fir natural circumstances, the basic process focused its analysis of the spatial structure of trees and natural spruce, fir trees in the process, Nature reveals business methods and approaches to natural larch artificial restoration and reconstruction of providing a scientific basis.From the three research plots in the structural characteristics: the accumulation changes stand, stand diameter structure to represent the attributes of statistical features. Using three parameters (point distribution pattern, distribution of mingling and Size differentiation) analysis of the Larix olgensis artificial and natural mixed forest in Changbai mountains changes in the spatial structure of the forest for 20 years. The results show that:Stand standard types of accumulation ratio little change, and maintain the stability.Stand forest types diameter distribution of non-age forest with a diameter of the basic characteristics of weibull distribution and logistic equation can accurately describe the diameter distribution, Logistic most accurate equations.Spatial distribution, spatial distribution of species invasion by the random distribution of natural gathered distribution change, Larix olgensis gathered by the distribution of minor changes to the uniform and random distribution. Stand overall pattern changed little, but a small-scale phenomenon gathered distribution. Analysis of the interaction between species, between all types of no significant positive correlation, larch -- needles, Hard wide -- coniferous occurred in some measure of negative correlation.Diameter differentiation: size ratio between the diameter trees difference is widening. Larix olgensis advantages in their structural units increased, native aiba nephrolepis , Tilia amurensis Rupr, Pinus koraiensis,abies Nephrolepis Maxim were advantages downward trend. Fraxinus mandshurica, Ulmus pumila and brushwood were advantages upward trend.Distribution of mingling: the stand mingling a slight overall decline, but the intensity remains mixed. Most of the mixed forest of Larix olgensis rise, but the natural species showed a decrease to varying degrees.