Spatial-temporal variations and risk assessment of the landscape ecosystem of Lijiang River basin
Based on Landsat TM/OLI remote sensing images from 2000,2005,2010,2015 and 2019,this study conducts land use interpretation in the Lijiang River basin,and quantitatively and qualitatively analyzes the spatial-temporal distribution of land use.RS and GIS technologies are applied to construct a landscape eco-logical risk assessment model.It analyzes the spatial-temporal evolution characteristics of landscape ecological risks in the Lijiang River basin,and it reveals the coupling relationship between land use change and landscape ecological risks.The results indicate that:(1)Land use types of the research area are mainly forest land and cultivated land,and there have changes between land use types,mainly manifested as the transformation of cul-tivated land into forest land and construction land.The area of construction land,water bodies,and forest land has been increasing year by year,with an increase of 70.62,32.44 and 75.83 km2 respectively during research period.The total area of cultivated land has decreased by 166.33 km2.(2)The overall ecological risk level of the research area has decreased,with low ecological risk areas decreasing first and then increasing,and higher and high ecological risk areas increasing first and then decreasing:from 2010 to 2019,the area of low ecological risk areas has increased by 282.64 km2,while the area of higher and high ecological risk areas decreased by 206.80 and 71.74 km2,respectively.(3)The area and rate of converting cultivated land into forest land in the southern part are higher than those in the northern part,resulting in a 6.32 km shift in the landscape ecological risk centroid from north to south.(4)The Moran's I values of landscape ecological risks in the research area from 2000 to 2019 are all greater than 0.65,indicating a strong spatial positive correlation and a tendency towards clustering.The spatial distribution of the LISA cluster map is consistent with the land pattern distribution during the same period,indicating that human activities have a certain degree of impact on the landscape ecological risk of the Lijiang River basin.
landscape ecology riskland use changespatial-temporal variationrisk centroidrisk assess-mentLijiang River basin
万方数据
维普
