环鄱阳湖城市群生态系统服务价值时空变化及权衡协同关系

Temporal and Spatial Variation of Ecosystem Service Value and Its Trade-offs and Synergies in the Urban Agglomeration Around Poyang Lake

[目的]量化和分析环鄱阳湖城市群生态系统服务价值及时空变化,探讨其生态系统服务之间的权衡协同关系,为区域生态环境保护与修复提供决策参考。[方法]以环鄱阳湖城市群2000年、2010年和2020年3期土地利用数据为依据,采用ESV当量因子法、生态贡献率以及生态系统服务权衡协同度模型等方法,探讨环鄱阳湖城市群ESV时空变化以及生态系统服务之间的权衡协同关系。[结果](1) 2000年、2010年和2020年环鄱阳湖城市群生态系统服务价值分别为4 163.50亿元、4 219.53亿元、4 202.93亿元,整体呈先增后减的变化特征。研究期间各地类中林地的ESV最大,在单项服务功能中水文调节的ESV最大。(2) ESV空间分布格局较为稳定,中高值格网分布于大型湖泊水库以及水系主干道,低值格网分布于城镇建成区和耕地开发程度高的乡村聚集区。ESV增加的区域主要为鄱阳湖外围,ESV减少的区域为南昌市区、九江市东北部、鹰潭市等区县的城镇建成区。(3)水域对ESV变化的贡献率最大,是影响环鄱阳湖城市群ESV增减变化的主要因素。(4)研究时段内协同关系为生态系统服务之间的主导关系,权衡关系集中存在于水资源供给、净化环境、水文调节与其他生态系统服务功能之间。[结论]修复和保护水域和林草地、严格管控建设用地扩张是维护环鄱阳湖城市群ESV良性增长和生态安全的有效措施。

[Objective]This study aims to quantify and analyze the temporal and temporal changes of ecosystem service value in the urban agglomeration around Poyang Lake,and to explore the trade-off and synergy between ecosystem services,which provides decision-making reference for regional ecological environmental protection and restoration.[Methods]Based on the land use data of the Poyang Lake urban agglomeration in the years 2000,2010,and 2020,this study employed methods such as the Equivalent Service Value(ESV)factor approach,ecological contribution rate,and the ecosystem service balance and synergy model to investigate the spatiotemporal variations in the ecosystem service values(ESV)and the balanced and synergistic relationships among ecosystem services in the Poyang Lake urban agglomeration..[Results](1)In 2000,2010 and 2020,the ecosystem service value of the urban agglomeration around Poyang Lake was 416.350 billion yuan,421.953 billion yuan and 420.293 billion yuan,respectively.During the study period,the ESV of forestland was the largest,and the ESV of hydrological regulation was the largest among the single service functions.(2)The spatial distribution pattern of ESV was relatively stable,with the medium and high value grids distribution in large lakes,reservoirs and main roads of water systems,and the low value grids distribution in urban built-up areas and rural agglomeration areas with high cultivated land development.The areas with an increase in ESV were mainly in the periphery of Poyang Lake,and the areas with a decrease in ESV were in the urban built-up areas of Nanchang City,the northeast of Jiujiang City,Yingtan City and other districts and counties.(3)Water area contributed the most to ESV change,which was the main factor affecting the increase and decrease of ESV in the urban agglomeration around Poyang Lake.(4)The synergistic relationship was the dominant relationship between ecosystem services during the study period,and the trade-off relationship mainly existed between water supply,environmental purification,hydrological regulation and other ecosystem service functions.[Conclusion]Restoring and protecting waters,forests and grasslands,and strictly controlling the expansion of construction land are the effective measures to maintain the benign growth of ESV and ecological security of the urban agglomeration around Poyang Lake.