Study On Forest Spatial Structure OfXinKen District Of Mao'er Moutain Forest Farm

Forest spatial structure determined the spatial arrangement of trees in the population and their ability to occupy the surrounding environment resources,which,to certain extent,determined the stability of the stand,the possibility of development and the size of the management space.With the rising of natural forestry,the details information of forest structure,process and many relations were becoming the prerequisite of forest management;among these information,the forest spatial structure about spatial relationship between single trees was becoming more and more important.Because forest spatial structure was an important factor influencing forest function,rational stand structure became the basis of giving full play to forest diverse functions;Therefore,how to scientifically and rationally optimizing forest spatial structure by cutting had become an important researching aim for forest operator.Reasonable description of forest structure had become an effective means to make forest management plan;Sharing and exchange of forestry resources using digital forestry not only helped forestry department making effective decision and planning,but also helped regional economy developing.XinKen working area of Maoer mountain forestry center in Heilongjiang province was chosen as our research,and the trees in 20 researched plots of National forest resource survey were chosen as our study objects.The Voronoi olygon distribution map was generated with ArcGIS Tyson polygon generation tool,and the corresponding spatial structure of the dominant tree species:Larch,white birch,Juglans mandshurica,Mongolian oak,Fraxinus mandshurica were analyzed.According the formulation of related forestry parameters,5 parameters of the forest spatial structure based on V-graph were obtained;the 5 parameters were mixed degree of diversity,size ratio,open degree,angle scale,degree of aggregation and the degree of competition.Our results indicated only the mixed degree of diversity and the size ratio of the dominant species were highly consistent with the parameters of 4 adjacent trees;but the angle scale and the open degree of the former were higher,this was related to that there were more than 4 trees around the object tree and the adjacent trees located in all directions.The correlation analyzing between each parameter of the spatial structure indicated that the open degree,the degree of aggregation and the degree of competition were linearly correlated with the size ratio.The spatial structure of forest land was evaluated and the improvement method was put forward,which provided the basis for the future transformation of forest ecosystem with reasonable structure and ecological function.