Health Analysis And Evaluation Of The Main Forest Types In The Typical Soil-gravel Area In North China

In order to provide scienfic basis for forest management ,health analysis and evaluation are given to the main forest types in the typical soil-gravel area in North China.The results are as the follows:Firstly,this paper has theoretically analyzed and discussed the ecosystem health's concept,connotation and research under progress. The study has divided the indexes which affect the forest health into four parts:foundational index, constitutive index, anti-jamming index and ecological benefit index. On the Foundational index healthy standard,the paper has chosen the biomass to take the expression of forest health's index,mainly through the site index of each forest differentiation model system,the plot's site index can be differentiated. Using the site index result,the biomass standard can be calculated by the biomass standard model system. On constitutive index healthy standard,the paper mainly has taken the Wuling Mountain forest community as standard,and studies the species richness,the individual quantity richness,the biodiversity index,the evenness and correlative factors which take as the criterion of the biodiversity index on forest health evaluation meso-scale of the Badaling forest center. On anti-jamming index healthy standard,the paper has chosen the forest fire and forest pest and disease to take the expression of forest health's index,the forest fire study has used the cluster analysis method to carry on the rank division,in the fire factor,the paper has chosen the altitude, canopy density, management measures,the distance to tourist point,dominant tree species,the distance to logging road,and carried on the result through the SAS statistics software,thus fire insurance rank division for I,II,III; The forest pest and disease study reflect the forest pest and disease disaster index by the quarantine importance,the harm degree,the area,the forest type four aspects through the model,then definite disaster rank. On ecosystem service value index healthy standard,the paper has chosen the direct value and the indirect value to take the expression forest health,and take the value of each hectare in Wuling Mountain as standard.Secondly,the paper evaluates forest health on the above indexes in Badaling forest center,taking AHP to determine the weight of index of travel forest,heath distance as method. The Badaling forest center's sub compartments divide into the health,the sub health and ill health three kinds,The sub healthy condition forest sub compartments account for the proportion in a big way,61.04%,the healthy condition forest sub compartments account for the proportion to be smallest,16.88%,the ill health condition forest sub compartments account for the proportion 22.08%. Because the sub health forest of...