基于RSEI的湖南省株洲市生态环境质量动态演变

Dynamic evolution of ecological environment quality in Zhuzhou City,Hunan Province based on RSEI

生态环境质量是反映区域环境优劣的重要指标之一.本文以2005年、2011年的Landsat5 TM和2017年、2020年Landast8 OLI遥感影像为数据源,通过扩展遥感生态环境指数(RSEI),增加人类活动指数、生物丰度指数、水体密度指数及土壤侵蚀指数后共8个评价因子构建综合评价体系,基于主成分分析法探索了湖南省株洲市在15年间的生态环境质量变化情况.结果表明:(1)株洲市2005年、2011年、2017年及2020年的生态环境质量均值分别为0.57、0.61、0.56及0.58,生态环境质量整体水平较高;(2)株洲市2005—2020年15年间生态环境质量呈现先上升后下降,最后再上升的趋势,生态环境质量整体上升;(3)影响株洲市生态环境质量的主要因子是生物丰度指数、土壤侵蚀指数以及人类活动指数.

Ecological environment quality is one of the important indicators to reflect the quality of regional environment.Using Landsat5TM remote sensing images in 2005and 2011and Landast8 OLI remote sensing images in 2017and 2020as data sources,this paper extended the remote sensing ecological environment index(RSEI).A comprehensive evaluation system was constructed by adding human activity index,biological abundance index,water network density index and soil erosion index.Based on principal component analysis,the change of ecological environment quality in Zhuzhou City,Hunan Province in the past 15years was explored.The results showed as follows.(1)The average values of Zhuzhou’s ecological and environmental quality in 2005,2011,2017and 2020were 0.57,0.61,0.56and 0.58,respectively,indicating a high overall level of ecological and environmental quality.(2)During the 15years from 2005to 2020,the ecological environment quality of Zhuzhou City showed a trend of first rising,then declining,and finally rising again,with the overall ecological environment quality rising;(3)Biological abundance index,soil erosion index and human activity index were the main factors affecting the ecological environment quality of Zhuzhou City.