Study On The Health Assessment And Influence Factors For The Mongolian Oak Forest Ecosystem In Beijing

This paper analyzed the healthy level of Mongolian oak forest ecosystem in Beijing and tried to find the influencing factors of the forest health ecosystem and proposed the control methods.It would provide the theory and techniques for the Mongolian oak forest ecosystem health management and the Mongolian oak forest ecosystem's service and function's exertion in North China.The research mainly contained the following contents:(1) Basing on the forest's ecosystem service,Organization,Vigor,Resilience and Soil condition are taken as the indicators to evaluate the healthy ecosystem,and selected 23 parameters to assess Mongolian oak forest ecosystem health in Beijing.The 23 parameters are the Gleason index and Shannon-Wiener index of stand,shrub and herb;habitat diversity;the complexity of the arbor vertical structure,the complexity of diameter distribution;the coverage of shrub and herb,canopy density;age structure;forest accumulation;the regeneration;young tree quantity;growth;anthropogenic disturbance, the condition of pest and the soil.(2) 9 Principal Components is extracted through the Reducing Dimension to the 23 indexes by Principal Components Analysis;Adopting Cluster Analysis Method and utilizing data in 28 plots of Mongolian oak forest,the health level of 28 plots has been classified into 5;Using Bayes discriminatory analysis method,5 linear discrimination functions and discrimination criterions were developed to distinguish the health level of new observational plots of Mongolian oak forest.(3) By means of correlation analysis between the healthy index and the evaluation index,the impact factor to the Mongolian oak forest can be found.According to the results of healthy discrimination,influencing factors to the health condition in every nature reserve is analyzed and put forward some suggestions to recovery and protection of Mongolian oak forest.