1980-2020年汾河流域生态系统服务价值的时空变化

Spatial and Temporal Changes of Ecosystem Service Value in Fenhe River Basin from 1980 to 2020

[目的]分析1980—2020年汾河流域生态系统服务价值时空变化特征,为该流域生态环境的科学调控和管理提供理论参考。[方法]利用汾河流域1980—2020年5期Landsat-MSS/TM/ETM遥感影像解译数据研究了流域土地利用变化特征,并估算了生态系统服务价值。[结果]1980—2020汾河流域土地利用中耕地、林地和草地一直处于主导地位,土地利用整体变化表现为耕地向建设用地转移;土地利用动态度表明2000—2020年土地变化明显高于1980—2000年。1980—2020年汾河流域土地利用总生态服务价值持续减少,空间分布整体上呈上游高,中下游低的趋势。从不同功能价值来看,调节和支持服务减少最多。不同土地利用程度与ESVI双变量LISA聚集图呈现出明显的空间负相关性,主要以汾河上游的低土地利用程度与高ESVI聚集分布为主。[结论]1980—2020年汾河流域土地利用/覆被变化对生态服务价值有较大影响。可以通过提高土地集约利用水平,促进该区土地利用结构向高生态服务价值发展。

[Objective]The temporal and spatial variation characteristics of ecosystem service value in Fenhe River basin from 1980 to 2020 were analyzed to provide theoretical reference for scientific regulation and management of ecological environment in the basin.[Methods]Based on interpretation data of landsat-MSS/TM/ETM remote sensing image from 1980 to 2020,the land use change characteristics of Fenhe River basin were studied,and the ecosystem service value was estimated.[Results]From 1980 to 2020,the cropland,forest and grassland had been in the leading position in the land use of Fenhe River basin.The overall change of land use was mainly from cropland to construction land,and the changing rate of land use from 2000 to 2020 was significantly higher than that from 1980 to 2000.The annual value of total ecosystem services in the Fenhe River basin decreased from 1980 to 2020.The spatial distribution of ecosystem service value(ESV)was higher in the upstream and lower in the downstream.From the perspective of different function values,the regulation and support services decreased the most.The land use degree and ESVI bivariate LISA aggregation map showed a significantly spatially negative autocorrelation pattern,which was mainly dominated by low land use degree and high ESVI aggregation distribution in the upper reaches of Fenhe River.[Conclusion]Land use/cover change of Fenhe River basin had a great impact on ESV during 1980—2020.Measures such as improving the level of land intensive use should be used to improve land use structure developing towards high ESV.