基于InVEST模型的石林县生境质量评估

Habitat Quality Assessment in Shilin County Based on InVEST Model

随着石林县城市更新建设步伐加快,一系列生态问题随之产生,评估该区域生境质量对发现县域生态环境潜在问题有着重要意义。基于InVEST模型生境质量模块,结合石林县2000年、2010年、2020年三期土地利用变化数据得到生境质量结果,并分析其时空演变特点。结果表明:经历时间跨度,石林县土地覆被类型发生了改变,主要表现为草地和林地的转出和其他覆被类型向耕地的转入;从总体情况看,石林县三期平均生境质量指数均大于0.6,但整体处于下降趋势,生境质量总体空间分布呈现出东南高西北低的特征;石林县整体生境质量处于差等级且呈逐年衰退趋势,截截至2020年超过石林县总面积的50%,其中石林街道和西街口镇下滑较较他区域严重,呈由西北向东南蔓延态势,较差等级占比在2010年之后开始攀升,占研究区面积20.67%,与林草植被的破坏关联密切。本次研究成果为石林城市推动可持续生态健康发展及相关环境保护工作提供了有力的支持和参考依据。

With the acceleration of urban renewal and construction in Shilin County,a series of ecological problems have emerged.Evaluating the quality of the habitat in this area is of great significance for discovering potential ecological environment problems in the county.Based on the InVEST model habitat quality module,combined with three periods of land use change data in Shilin County from 2000 to 2020,habitat quality results are obtained and their spatiotemporal evolution characteristics are analyzed.The results show that over time,the land cover types in Shilin County have changed,mainly manifested as the transfer of grassland and forest land,and the transfer of other cover types to cultivated land;From the overall situation,the average habitat quality index of the three phases in Shilin County is greater than 0.6,but it is in a downward trend overall.The spatial distribution of habitat quality shows a characteristic of high in the southeast and low in the northwest;The overall habitat quality of Shilin County is in a poor level and shows a declining trend year by year.As of 2020,it has exceeded 50%of the total area of Shilin County.Among them,Shilin Street and Xijiekou Town have experienced a more severe decline compared to other areas,showing a trend of spreading from northwest to southeast.The proportion of poor levels has started to rise since 2010,accounting for 20.67%of the study area,which is closely related to the destruction of forest and grass vegetation.The research results provide strong support and reference for promoting sustainable ecological and healthy development and related environmental protection work in Shilin City.