Dynamic assessment of ecological security in the Yangtze River Economic Belt based on three-dimensional ecological footprint
The Yangtze River Economic Belt(YREB)is one of the key strategic development regions in China in the new era.Its ecological construction plays a pivotal role in the socioeconomic development and ecological barrier construction of the Yangtze River Basin,therefore it is very important to carry out dynamic ecological security assessment.This study used an improved three-dimensional footprint model to calculate the footprint depth,footprint size,and 3D ecological footprint of the YREB from 2000 to 2020,and constructed the ecological pressure index,ecological and economic coordination coefficient,occupancy rate of capital flows,and use ratio of stock-flows to quantify the ecological security changes.Finally,partial least squares regression was used to analyze the driving factors of the 3D ecological footprint,in order to understand the ecological security status of the YREB in the process of rapid urbanization,and to promote the coordinated development of the region.The results show that:1)Temporally,the footprint size of the YREB showed an increasing trend during the study period,but the overall utilization level was not high.The footprint depth was large and showed an obvious increasing trend(except for the Yangtze River Delta),which met the demand for natural resources by consuming capital stock.Spatially,the land use type footprint size was high in the west and low in the east,while the footprint depth was the opposite.In terms of land use type contribution,the proportion of land use types in the footprint size and footprint depth was unbalanced.The contribution rate of cultivated land to the footprint size and depth was the largest,and the ecological sustainability of woodland was better than other land use types.2)The natural and socioeconomic environments in different regions in the YREB are very different,and their ecological security situation also differs.The Yangtze River Delta area overconsumes the stock and the ecological pressure is huge.In the middle reaches of the Yangtze River and the Chengdu-Chongqing area,the ecological environment is relatively secure,but there is a trend of imbalance between the ecological environment and economic development.The upper reaches of the Yangtze River have excellent natural endowment and high ecological security.3)Driving factor analysis showed that energy consumption,economic development,and urban expansion play a positive role in driving the three-dimensional ecological footprint,while science and technology development level and ecological construction have little impact on the utilization of natural resources at present.It is necessary to increase the investment in science and technology development,optimize the industrial structure,and promote the positive interaction between ecological environment protection and economic development.
three-dimensional ecological footprintecological securitydynamic assessmentYangtze River Economic Beltdriving factor analysis
NETL
NSTL
万方数据
