| Global climate anomalies and the unreasonable development and utilization of human resources to natural resources resulted in the geographical changes of snow and ice disasters and its frequency and intensity has showed an upward trend.Ice disaster is a common natural disaster,and its impacts on the natural and social ecosystems are comprehensive and integrated.Especially it has a more significant influence on the subtropical forest ecosystem.The concept of resilience is regarded as an important way for ecosystems to deal with extreme weather events.The resilience of ecosystems is an important basis for the restoration and sustainable management of forest ecosystems.Accurate quantitative assessment of forest ecosystem resilience is of great significance to its Sustainable development.This paper chooses Dao County as research object.Dao County is located in Yongzhou City,Hunan province in the hilly and mountainous areas of southern China.Based on the concept of ecosystem resilience,the evaluation index system of forest ecosystem resilience was selected and it quantitatively evaluated the self-organization ability of forest ecosystem,disaster resilience and adaptability in Dao County,and then comprehensively evaluated the restoration of forest ecosystem in Dao County,and quantitatively analyzed the influence of key factors on forest ecosystem restoration.The results showed that the average self-organization ability of the forest area was 0.362,the resistance ability was-0.138,the adaptability was 0.190,and the weighted average of the forest ecosystem was 0.274,and the western part of the county and the southern margin has a higher level of resilience,while the northern part of the county and its northwest region is obviously in a lower level of resilience,most of the other areas of the restoring force is in the middle level.This study makes a quantitative evaluation of forest ecosystem restoration in hilly areas of southern China,and analyzes the spatial distribution of ecosystem resilience of different influencing factors,which can provide better theoretical support for forest ecosystem management decision,and contribute to the sustainable development of forest ecosystems.Through the quantitative analysis of topographic factors,it is found that the resilience of forest ecosystem has been increasing obviously with the increase of slope.The higher the altitude is,the higher the level of restoring force of forest ecosystem under ice and snow disaster.With the increase of age,the resilience of forest ecosystem is also increased,and this trend is inseparable from the ability of vegetation to carry the disaster.With the increase of the complexity of the community,the ecological restoration of forest is showing the trend of "V"type.The resilience of the native tree species is stronger than the introduced alien tree species,and the resilience of the coniferous woodland is higher than that of the broad-leaved species under the disturbance of rain and snow disaster,and the forest restoration which is under natural growth of the smaller human intervention has relatively stronger resilience.The innovation of this research lies in:Based on the snow and ice disaster in 2008 and different from the previous study,in which the method of quantitative indicators is used to evaluate its restoring force under a certain state.While in this study,the ability of self-organization before disaster-the ability of resistance to disaster-the ability of post-disaster adaptability was quantitatively evaluated by the restoration ability of forest ecosystem under the interference of snow and ice disaster.The statistical analysis of the distribution of forest ecosystem resilience with the key ecological factors can provide better theoretical support for the management decision of forest ecosystem and contribute to the sustainable development of forest ecosystems. |
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