Ecological Risk Assessment of Landscapes in Shilin Yi Autonomous County Based on Landscape Pattern
Based on remote sensing images of Shilin Yi Autonomous County from 2000 to 2020,the composition and transformation of landscape structure in the study area are quantified using ENVI,ArcGIS and Frastats4 landscape analysis software to establish an ecological risk evaluation system.The results show:1)Arable land accounts for more than 50％of the total land area of Shilin.Arable land decreased in area by 27.51 km2,and impervious surface increased by 41.60 km2 from 2000 to 2020,while the area of forests and grasslands have a slight change,but showing a decreasing trend in 2010-2000;2)The comprehensive ecological risk in Shilin had changed dramatically during the 20 years,and the risk index reached the peak at 0.312 9 in 2010.The index of water landscape which is a high-risk landscape was as high as 2.379 3 in 2010,and arable land,with the greatest ecological impact on the landscape in Shilin,contributed as high as 52％to the weight;and 3)The study area is dominated by high ecological risk areas due to frequent human activities,which accounts for 66.5％of the total area of the study area.To sum up,the ecological environment of Shilin showed a trend of improvement-degradation coexistence with better landscape ecological security throughout the study period.It is suggested that the relationship between ecological protection and economic development should be properly settled through regulating the local industrial structure and formulating corresponding measures for different risk areas.
land usespatial and temporal evolutionlandscape patternecological riskspatial auto-correlation analysis
NETL
NSTL
万方数据
