基于InVEST模型的赤水河流域生态系统服务功能评估研究

Research on evaluation of ecosystem services in chishui river basin based on InVEST

通过开展流域生态系统服务功能评估,分析生态系统服务功能时空动态演变趋势,能够快速识别流域整体健康水平和退化程度,为流域生态系统保护提供决策依据。本研究采用ArcGIS和Fragstats软件分析了赤水河流域1980—2015年6期土地利用的时空动态变化和景观格局特征,采用InVEST模型综合评估了赤水河流域的水源供给、土壤保持、碳存储和生境质量等生态系统服务功能,并分析了35年间流域生态系统服务功能的时空分异特征。研究结果表明:赤水河流域1980—2015年土地利用未发生显著变化,保持了相对天然的生态系统状况。流域产水量近年来略微增加,中下游是主要的产水区。流域整体土壤侵蚀状况为微度侵蚀,轻度侵蚀面积近年来略微增加。赤水河流域为碳源区,流域碳储量呈降低趋势。流域生境质量指数平均值约为0.78,生境质量整体呈改善趋势。研究可为赤水河流域的生态环境保护提供参考。

By assessing watershed ecosystem services(ESs)and analyzing the spatio-temporal dynamic evo⁃lution of ESs,the overall health level and degradation of ecosystem can be quickly identified,so as to make decisions for watershed ecosystem protection.In this paper,spatio-temporal changes of land use from 1980 to 2015 and landscape patterns in the Chishui River Basin were analyzed using ArcGIS and Frag⁃stats.InVEST was adopted to comprehensively evaluate the ESs of water yield,soil retention,carbon stor⁃age and habitat quality,and to analyze the spatio-temporal distribution of ESs during the past 35 years.The results demonstrate that the land use changes in the Chishui River Basin are not significant,and the relatively natural ecosystem condition is maintained.Moreover,the water yield in the basin has slightly in⁃creased in recent years,and the middle and the lower catchment are the main areas of water production.The general soil erosion status in the basin is slight,and the areas of light erosion has increased in recent years.The Chishui River Basin is a carbon source area,but the carbon storage in the basin is decreasing.Nevertheless,the average habitat quality index of the basin is about 0.78,and the habitat quality has im⁃proved.This study can provide reference for the ecological environment protection of Chishui River basin.