基于IRSEI的石羊河流域生态环境质量时空变化及驱动力分析

Changes in spatial-temporal patterns of ecological environment quality in Shiyang River and driving forces:An analysis based on improved remote sensing ecological index

基于绿度、湿度、热度、盐度、荒漠化程度五个指标,构建了改进遥感生态指数IRSEI,提出了完全基于遥感数据的石羊河流域生态环境质量综合评价方法。以2000-2020年为时间序列,对石羊河流域生态环境质量时空分布特征和驱动因素进行了分析。结果表明:石羊河流域生态环境质量整体偏低,空间差异显著;近20年间,流域生态环境质量整体有所改善,绿洲边缘、上游林地和草地区域改善较显著;流域生态环境质量受自然因素和人为因素共同影响,年平均气温、年降水量、海拔、土地利用类型是流域生态环境质量空间分异的主要驱动力因子,驱动因子之间的交互作用表现为双因子增强和非线性增强,土地利用类型和其他驱动因子的交互作用最为明显。

Based on the five indexes of greenness,humidity,heat,salinity and desertification,we construct an improved remote sensing ecological index(IRSEI),and propose a comprehensive evaluation method for ecological environment quality in the Shiyang River Basin based entirely on remote sensing data.Taking 2000-2020 as the time series,the spatial-temporal distribution characteristics of ecological environment quality in the Shiyang River Basin and driving factors were analyzed.The results show that:The overall ecological environment quality of the Shiyang River Basin is low,and the spatial difference is significant.In recent twenty years,the ecological environment quality of Shiyang River basin has been improved,and the oasis fringe area,upstream woodland and grassland areas have improved significantly.The ecological environment quality of the Shiyang River basin is affected by both natural and human factors,and the annual average temperature,annual precipitation,altitude and land use type are the main driving factors for the spatial differentiation of the ecological environment quality in the basin.The interaction between the driving factors is mainly manifested as double factor enhancement and nonlinear enhancement,especially the interaction between land use type and other driving factors is the most obvious.