Evaluation Of Ecological Restoration Ability And Ecological Sensitivity Of Secondary Forest In Northern Greater Khingan Mountains

Greater Khingan Mountains is the only cold temperate coniferous forest area in China.Due to excessive logging,forest resources are seriously damaged.In addition to the impact of forest fires,forest resources have shrunk and forest functions have been seriously damaged.Therefore,it is very important to promote vegetation restoration and ecological environment improvement through scientific and reasonable forest transformation measures.This thesis takes the secondary forest in the north of Greater Khingan Mountains as the research object.By exploring the relationship between the ecological restoration ability and ecological sensitivity of the secondary forest,combined with the results of field investigation and evaluation,this thesis puts forward targeted and accurate suggestions for the management measures of the secondary forest,so as to improve the quality of the secondary forest and improve the self-regulation ability of the secondary forest.The main conclusions of this thesis are as follows :(1)Evaluation results of ecological restoration ability of secondary forest in northern Greater Khingan Mountains.The structural equation model was used to determine the weight of the evaluation index of the ecological restoration ability of the secondary forest in the north of Greater Khingan Mountains.The k-means clustering analysis method was used to determine the evaluation standard of the ecological restoration ability.The equidistant division method was used to divide the evaluation index standards into five grades,and each grade was given a certain score.The difference analysis of the ecological restoration ability of secondary forests in the northern part of the Greater Khingan Mountains showed that the comprehensive score of the ecological restoration ability evaluation of 96 plots was 1.54-3.53,of which the poor accounted for the largest proportion,36 plots,accounting for 37.5 % of the total.On the whole,the ecological restoration ability of the two secondary forests was mixed forest > pure forest.The comprehensive score of 25 plots in the mixed forest plot exceeded 2.34,accounting for 40.3 % of the total mixed forest plot.The comprehensive score of 11 plots in pure forest plots exceeded 2.34,accounting for 32.4 % of the total number of pure forest plots.(2)The evaluation results of ecological sensitivity of secondary forest in northern Greater Khingan Mountains.The variation coefficient method was used to determine the weight of the ecological sensitivity evaluation index of the secondary forest in the northern part of the Greater Khingan Mountains.The Arcgis was used to superimpose the natural environmental conditions and human influences in the northern part of the Greater Khingan Mountains with the index weight,and the ecological sensitivity distribution of the secondary forest in the northern part of the Greater Khingan Mountains was obtained.The difference analysis of the ecological sensitivity of the secondary forest in the north of Greater Khingan Mountains was carried out.The value range of the comprehensive ecological sensitivity index was 1.00-4.98,and the area of the middle sensitive area was the largest,192596.14 km2,accounting for 28.49 %.(3)The relationship between ecological restoration ability and ecological sensitivity of secondary forest in northern Greater Khingan Mountains.Through regression analysis,this thesis determines that there is a negative correlation between ecological recovery ability and ecological sensitivity.The higher the ecological sensitivity level,the stronger the response ability of the region to external influences,the weaker its anti-interference ability and the weaker its self-recovery ability.The highly sensitive area should be divided into ecological protection areas.On the contrary,the lower the ecological sensitivity level,the weaker the response ability of the region to external influences,the stronger its anti-interference ability,the stronger its self-recovery ability,and the moderate development and construction.