淮河生态经济带土地生态安全时空分异分析OA北大核心CSTPCD

The DPSIR method is used to study the regional scale and spatial scale of the Huaihe River area,and the land-space and time-space pattern of the Huaihe River eco-economic circle from 2009 to 2021 were ana-lyzed using the TOPSIS method.The findings indicate that:(1)The level of ecological security of land was im-proved from 0.268 3 in 2009 to 0.335 4 in 2021,the soil environmental quality in this area has increased from a less secure level to a critical level,and the drivers,states,pressures,impacts,and response sub-systems were in an upward trend,level of ecological security of land generally demonstrates an improving trend;(2)The ecological security of the land in the study region gradually increased during 2009-2013,2013-2015 leveled off,2015-2016 declined,and 2016-2021 increased year by year;(3)By 2021,the overall land ecological security level of the 25 municipalities in the study area is projected to increase by 1 level compared to 2009,and the characteristics of spa-tial differentiation levels are significant,it presents a overall spatial differentiation of'Shandong 4 cities>Jiangsu 7 cities>Henan 6 cities>Anhui 8 cities'.