Ecosystem Health Assessment Of Pinus Tabulaeformis In The Headwaters Of Qinhe River

Forest is the natural resources on which human beings depend.It plays an important role in water conservation,climate regulation,wind protection and sand fixation.In recent years,due to man-made or natural factors resulting in forest health problems,how to improve the level of forest health,and effectively play the role of forest ecological services is the main problem we are facing.Objective health assessment of forest ecosystem can provide reasonable countermeasures for formulating scientific forest protection and play an important guiding role in studying the development trend of forest health in the future.In this study,six 50m×50m Pinus tabulaeformis quadlings in the Qinhe headwaters area were selected as the research objects to evaluate their health status,analyze the main factors affecting the health of the Pinus tabulaeformis ecosystem,and put forward reasonable suggestions to provide a good theoretical basis for the ecological function of Pinus tabulaeformis in the Qinhe headwaters area.This paper mainly studies the following aspects:(1)Using expert scoring method and principal component analysis(pca)12 indexes from the aspects of productivity,organizational structure and habitat three constructing evaluation index system,these 12 indexes were volume per unit area,average diameter at breast height,average height,average crown breadth,the shrub layer number of species and tree species and natural regeneration seedlings,seeds,seedlings,tree mortality,herb layer coverage,thickness of humus layer,litter layer thickness.(2)Use 12 indexes of filtered through the analytic hierarchy process(ahp)to build judgment matrix respectively,using software to calculate the weight of each index between,according to previous summed up the community slightly ecosystem health evaluation model according to community slightly evaluation standard can be concluded that in six community slightly sample,5 community slightly sample health index of0.8772,in good health;The comprehensive health indexes of no.2,no.3and no.4 were 0.6004,0.6632 and 0.6437,respectively.Thecomprehensive health index of no.1 pinus tabulaeformis was 0.2644,which was in a sub-health state.The comprehensive health index of no.6pinus tabby forest is 0.1245,which is in an unhealthy state.(3)Using SPSS software to 12 evaluation indexes and find out the health comprehensive index analysis of the correlation,volume per area and health index of correlation coefficient is 0.635,the correlation coefficient of tree species and the health index is 0.568,it shows the influence volume per unit area and tree species river dawn source area community slightly the main two factors of health.On the whole,the average value of the comprehensive health index of 6 sample sites of pinus tabaei forest in qinhe source area is 0.5295,indicating that the pinus tabaei forest ecosystem in this area is in a healthy state.