Environmental Vulnerability Assessment Of Forest Ecosystem In Sichuan Province

With the rapid development of society,ecological problems are becoming more and more serious.As the "lungs of the earth",forests are also suffering more and more serious damage,and the forest ecosystem is deteriorating day by day.In recent years,vulnerability assessment of forest ecosystem has become a hot issue in sustainable development research.Based on the research of scholars both at home and abroad,in sichuan province as study area,the scientific evaluation of forest ecosystem environment vulnerability of sichuan province,has important significance to the local ecological construction and sustainable development.Based on the natural environment and human indicators of sichuan province in 2015 data as the foundation,using ARCGIS,SPSS software to deal with the original data,then by principal component analysis(pca)to construct the forest ecosystem environment vulnerability evaluation index system of sichuan province.Specific research area forest ecosystem environment vulnerability are analyzed,and combining the forest structure,topography,climate,and humanity social environment factors such as comprehensive analysis and evaluation of the vulnerability,for each city state county of sichuan province provided a reference for the ecological management and construction.This paper mainly draws conclusions:(1)from the sichuan province of climate,topography,forest structure and social factors into consideration,chose to represent forest ecosystem environment vulnerability in southwestern sichuan province,11 indicators as the main metrics and according to the ecological fragile district vulnerability degree of difference,the whole sichuan province is divided into five different classification,respectively is: extremely vulnerable,highly vulnerable,medium,low vulnerable,fragile fragile micro degrees.(2)according to the evaluation results and combined with the administrative boundary map of sichuan province,the five vulnerable regions divided by sichuan province were analyzed.Among them,micro vulnerable areas account for 37.7% of the total area of sichuan province.Low vulnerability area accounted for 22.5%;Moderately vulnerable areas accounted for 27.1%.Highly vulnerable areas accounted for 11.2%;Extremely vulnerable areas account for 1.4 per cent of sichuan's total area.(3)analysis based on the distribution of the forest ecosystem in the vulnerable areas in sichuan province.The extremely vulnerable areas were 11% distributed in the dredged forest,and the rest were less than 10%.The highly vulnerable areas are mainly distributed in woodland and undeveloped woodland,accounting for 15% and 21% of the area respectively.The moderate vulnerable areas are mainly distributed in woodlands,undeveloped woodlands and nursery grounds,accounting for 34%,29% and 21% of the area respectively.The low-degree vulnerable areas are mainly distributed in woodlands,dredged woodlands,shrubby woodlands,undeveloped woodlands and suitable woodlands,accounting for 37%,64%,69%,41% and 28% respectively.Microfragile areas are mainly concentrated in nursery and woodland,accounting for 56% and 44% respectively.(4)high and extremely vulnerable areas are mainly distributed in high-altitude alpine plateau regions;The moderate vulnerable areas are mainly distributed in the high altitude area of zhongshan.Low-and minimally vulnerable areas are mainly distributed in low-altitude hilly and plain valley areas.(5)the extreme and highly vulnerable area above 35 ° slope of slope,steep slope distribution;Moderately vulnerable areas are mainly distributed in more than 15 ° slope gradient magnitude area;Micro degree and low vulnerable areas in the flat slope and gentle slope gradient under 14 ° have larger distribution.(6)based on soil erosion analysis.The extremely vulnerable areas are mainly distributed in moderate,high and extremely eroded areas,accounting for 18%,12% and 26% respectively.The area of highly vulnerable areas in moderate,high and extreme erosion areas was 22%,32% and 37 respectively.The distribution of the moderate vulnerable areas in the five erosion levels was small,all within the range of 15-28%.Low vulnerability areas are mainly distributed in areas with general erosion and mild erosion,accounting for 34% and 24% respectively.Microvulnerability areas are rarely distributed in extreme erosion areas,only 10%,accounting for 27%,35%,29% and 21% respectively in the other four erosive areas.(7)extremely,height and moderately vulnerable areas are mainly distributed in the annual average temperature 14.6 ~ 5.6 ? cold area and 17.7 ~ 22.5 ? hot zone;Degree of micro and low vulnerable areas are mainly distributed in the warm area of the annual average temperature 0.7 ~ 12.6 ?.(8)sichuan province is divided into three levels of forest ecosystem management zones,namely northwest management zone,south supervision zone,central sichuan province and east sichuan prevention zone.In the central and eastern sichuan prevention areas,the micro-vulnerability areas account for 76.8 percent of the total area of the administration area,while the remaining vulnerability areas are relatively small.In the supervision area of south sichuan,the low-degree vulnerable area accounts for 42.3% of the total area.The area of the northwest sichuan administration area,the moderate and highly vulnerable areas,is large,accounting for 85.7% of the whole administration area.