Stand Spatial Structure Optimization Combined With Habitat Suitability Of Great Spotted Woodpecker

In recent years,with the loss of wildlife habitat fragmentation and habitat,factors affecting wildlife habitat fragmentation has become the focus of research content.The results of a comprehensive study of habitat fragmentation point of view,human interference is the main cause of wildlife habitat fragmentation.As the expanding range of human activities,causing wildlife habitat quality decreases,while affecting the survival and reproduction of the species,and ultimately into endangered.Human disturbance generally includes logging,hunting and grazing,etc.,while forest logging,as a basic means of forest resource management and management,it affects the wildlife habitat.Unreasonable amount of thinning or harvesting pattern,not only destroy wildlife habitat suitable,but also reduce the utilization rate of wild animals.Traditional forest optimization is to grasp the characteristics of forest stand structure,growth and distribution of trees.The management objective is to improve the multi-functional benefits of the forest and promote the healthy and stable development of the forest.However,from the perspective of sustainable forest management,habitat protection should be combined on the basis of traditional goals to achieve ecological thinning.This article Taking Maoershan Mountains forest farm as the study area.,based on the 2016 survey data of the Maoershan Mountains and 8 plots(2*100 m×100 m and 6*50×50 m)data.The main research contents and results of this paper are as follows:(1)Based on the 2012 second-class survey data of the Maoershan Mountains forest farm,Analysis of habitat suitability of the Great Spotted Woodpecker with GIS spatial analysis technology.Eleven factors that have a greater impact on the habitat selection of Great Spotted Woodpecker are selected from the three aspects of geographical environment factors,biological environment factors and human interference factors.Six evaluation factors were selected through principal component analysis:stand type,stand age,average DBH,proportion of dead trees,distance from road and distance from water source.Determine the weight of each factor by analytic hierarchy process and construct a suitable evaluation index for the habitat of the Great Spotted Woodpecker habitat Maoershan Mountains forest farm.Habitat suitability index(HSI)was used to evaluate the habitat suitability and obtained a comprehensive distribution map of the Great Spotted Woodpecker habitat Maoershan Mountains forest farm.The evaluation results of the study area were divided into suitable[0.8,1],more suitable[0.5,0.8)and unsuitable[0,0.5),The total area of Maoershan Forest Farm is about 26496hm2,respectively,which accounted for 8.51%,61.60%and 29.89%of the total area of the study area.(2)Analyze the stand structure characteristics of 8 plots in the study area by adopt non-spatial structure index(stand diameter structure,species composition,canopy closure,plant number density)and spatial structure index(complete mingling,neighborhood comparison,uniform angle,competition index,crowding index,opening degree,stand layer index).The results show:all plots overall broad-leaved species are more high stand opacity;stand diameter class reasonable distribution of trees;the degree of tree species isolation in each plot is moderately mixed and the lack of open forest canopy density is more dense state;the size of stand had no distinctive difference and its distribution patterns were arranged randomly or assembly,the forest vertical structure is poor.(3)The objective optimization function Q(x)is constructed based on complete mingling,uniform angle index,competition index,stand layer index and habitat suitability index.Optimized simulation on the two plots of BH02 and ZS01 showed that:the best number of cutting trees are 98 and 38,thinning intensity is 26%and 14%.After the optimization,the overall quality of the stand is improved without reducing the suitability of the habitat.Application examples verify the feasibility of the model,combined with habitat suitability index of stand structure optimization model it is based on a new attempt to optimize the traditional model of stand structure.Provide a theoretical basis for improving forest quality and ecological logging.