Study On The Evaluation Of Forest Naturalness In The Suburb Of Zhuzhou City

Due to the current situation of global forest ecosystem degeneration,how to protect and restore the ecosystem of the forest has become the focus of world attention.Vegetation and native vegetation and reality in terms of community characteristics,habitat conditions comparison,is the foundation of the recovery of forest.This study on the basis of the theory of integrated forest naturalness studies both at home and abroad,by using the analytic hierarchy process(ahp),constructed the evaluation index system of Zhuzhou city suburb forest naturalness,and then calculating Zhuzhou suburb forest naturalness degree,which is based on the basic unit of subcompartment and the investigating data of forest resource in 2016.Finally come to a conclusion as follows:(1)the construction of evaluation index system of zhuzhou city suburb forest naturalness.From the forest ecological disturbance degree and its potential natural difference degree of zonal climax,established the zhuzhou city suburb forest naturalness evaluation hierarchical structure model,the target layer for the suburban forest naturalness evaluation criterion layer for forest community succession level,biological diversity,forest productivity and forest disturbance degree,index layer for vegetation type,tree top fitness,Simpson index,Shannon index and biomass per unit area,the forest community structure,crown density and coverage,forest origin,forest disaster,the cutting interference.Analytic hierarchy process(ahp)is used to build the evaluation index system of zhuzhou city suburb forest naturalness,ZRD=0.2525C11+0.1262C12+0.0650C21+0.0650C22+0.1419C31+0.0564C32+0.0895C33+0.1004C41+0.0633C42+0.0398C43.(2)the zhuzhou city suburb forest naturalness degree evaluation.Based on vegetation type,tree top fitness,Simpson index,Shannon index and biomass per unit area,forest community structure,crown density and origin,the cutting interference,forest coverage,forest disaster,the characteristics of the 10 indexes such as to be incorporated into four types,namely forest community succession level(vegetation type,tree top fitness);Biology,species diversity(Simpson index,Shannon index);Forest productivity level(biomass per unit area,forest community structure,crown density and coverage).Forest disturbance degree(forest origin,the cutting interference,forest disaster).Quantitatively processing to various indicators and the relevant explanations.According to the forest land area ratio of zhuzhou Luotang area,LuSong area,tian yuan area and Shifeng area,to take respectively,42,63,59,and 30 sub-compartment,total 194 small classes,zhuzhou city suburb forest naturalness degree value is calculated,zhuzhou city suburb forest naturalness of 0.7014 in 2016.In zhuzhou city suburbs,for the overall,natural degree calculation results of zhuzhou city suburb forest sampling inspection,samples drawn 100,sampling value of 0.7014,in the sampling accuracy is 91.26%,the standard error of 0.10,the error limit of 0.0468,the confidence interval for the[0.6546,0.6546].(3)comparative analysis in 2013 to 2016,suburban forest naturalness degree,the major changes mainly reflects in zhuzhou city suburb forest naturalness in 2016,which increased 0.0938,it's specific to each index factor,incremental index for biomass per unit area,crown density and coverage,forest community structure and Shannon index,Simpson index.After three years of construction,zhuzhou city forest construction work has made great progress.In view of the naturalness degree of five levels,respectively putting the corresponding management measures;On vegetation type,tree top fitness,Simpson index,Shannon index and biomass per unit area,forest community structure,crown density and forest origin,the cutting interference,forest coverage,forest disasters and the other factors,respectively to compare the size of the value of the naturalness degree,putting the corresponding suggestions and measures.The existing forest management,from the individual,population,community,ecological forest system such as multi-level knowledge structure and function of the forest,give full consideration to the stability of the community,close to nature management measures,promote the progress of forest positive succession,improve forest naturalness degree.