Study On The Optimization Technology Of Secondary Forest Structure Of Quercus Mongolica Fisch In Daxing'anling

In this paper,the Quercus mongolica Fisch in the Greater Xing'an Mountains of Inner Mongolia was taken as the research object.The data were collected by a field survey with a fixed slope on one slope,and the non-spatial structure and spatial structure of the secondary forest of Quercus mongolica Fisch were analyzed.According to the results of the analysis,combined with RStudio software,the adjustment plan for optimizing the stand structure is proposed,and the corresponding scientific suggestions are given according to the status quo of the secondary forest stands of the Quercus mongolica Fisch in Daxing'anling.The main results are as follows:The tree species of the secondary forest of Quercus mongolica Fisch in Daxing'anling is mainly Quercus mongolica Fisch forest,and black birch is the associated tree species.The ratio of tree species is 9:1.The height of the tree grows with the increase of the diameter of the breast.The diameter distribution is left-sided single-peak mountain shape,which does not conform to the ideal anti-J-type distribution of different-aged forests.The negative exponential function is used to fit the diameter distribution equation.The q value is not within the evaluation standard,indicating that the diameter distribution is unreasonable.The age structure of the forest in this study area is a growing trend and is in the form of a positive pyramid.However,there are fewer seedlings and young trees,and there are more trees in old age.The accumulation ratio of large,medium and small diameter forests is 1:7:2,and the main forest is medium diameter.The community forest congestion degree is greater than 1,which proves that the forest is sparse,multi-void,and the forest density is 826 plants/hm2,which does not meet the standard of forest plant number,and the forest density is relatively low.(2)The mixed degree of the stand tends to be mixed at zero,the medium forest is more,the average diameter of the DBH is 0.51,which belongs to the middle forest stand.The angular scale is 0.55,which is greater than 0.517.It is a cluster-like distribution and should be developed like a random distribution.Its stand is single and the location of the forest is unreasonable.(3)Combining with domestic scholars to determine the target forests of tree species composition,stand density,age structure and spatial structure,through the analysis of the current situation of Quercus mongolica Fisch,divide the plot into three plots,use live seed,and rejuvenate The transformation methods of replanting conifers were adjusted separately.(4)According to the structural status of the secondary forest structure of the Quercus mongolica Fisch in Daxing'anling,from the aspects of economic foundation and ecological benefits,the adjustment methods mainly include light-transfer cutting,pruning,artificial replanting and sowing.Artificial replanting selects suitable spruce,Korean pine and Pinus sylvestris var.mongolica for the purpose of protecting native tree species,improves the quality of stand,and scientifically and rationally proposes measures to adjust the stand structure to promote the sustainable development of Quercus mongolica Fisch,to make the forest stand optimization design.