水土保持研究2024，Vol.31Issue(6)：139-148,160,11.DOI:10.13869/j.cnki.rswc.2024.06.004
汉江流域生态安全时空变化及其影响因素
Spatial and Temporal Changes in the Ecological Security of the Hanjiang River Basin and Its Influencing Factors
摘要
Abstract
[Objective]This study aims to investigate the characteristics of spatiotemporal changes in ecological security in the Hanjiang River Basin,to explore the influence of human activities on ecological security changes in the region,so as to provide a basis for ecological restoration work in the Hanjiang River Basin.[Methods]Hanjiang River Basin was taken as the research object.The ecological security status of the Hanjiang River Basin from 2001 to 2020 was evaluated from the perspective of spatial and temporal changes by using the PSR model and the comprehensive index method,combining with the index of land use and landscape pattern.[Results](1)From 2001 to 2020,the main land use modes in the Hanjiang River Basin were forest and grassland,accounting for 71.82％of the total land area.The main direction of land use transfer was the change from grassland to forest.Compared with 2001,in 2020,the area of forests increased the most,with an increase of 1 221.87 km2.The area of wetlands,water bodies and urban land showed a general trend of growth,while the area of arable land declined.(2)The ecological security status of the Hanjiang River Basin from 2001 to 2015 showed a trend of gradual improvement.In 2015,the ecological safety level reached the best level in 20 years,and the area of general safety and above ecological safety areas increased from 27 623.86 km2 in 2001 to 38 514.67 km2 in 2020.In general,the area with poor ecological safety grade accounted for the largest proportion.The ecological safety status still needs to be improved.(3)The values of Moran's I of ESI in the Hanjiang River Basin from 2001 to 2020 were 0.187,0.174,0.185,0.180 and 0.133,respectively,with significant positive spatial correlation and spatial aggregation.(4)The results of the Geodetector showed that the strongest factors explaining the ESI during the study period were vegetation cover,maximum patch index and landscape spread.There was a significant interaction enhancement effect between the factors,and annual precipitation interacted with other factors to enhance the interpretation of the ecological security index.[Conclusion]The ecological security level of the Hanjiang River basin still needs to be improved.It is necessary to enhance the vegetation cover,to improve the climate conditions,to optimize the land use pattern,and to promote the construction of ecological security and sustainable development of the Hanjiang River Basin.关键词
生态安全/生态安全指数/综合指数法/汉江流域Key words
ecological security/ecological security index/comprehensive index method/Hanjiang River Basin分类
资源环境引用本文复制引用
符蓉,梁玉洁,谢治国,韩沛东,王绒,温仲明,张伟,刘洋洋..汉江流域生态安全时空变化及其影响因素[J].水土保持研究,2024,31(6):139-148,160,11.基金项目
陕西省林业科技创新重点专项(SXLK2022-02-7) （SXLK2022-02-7）
国家自然科学基金(42107512) （42107512）
