基于改进的遥感生态指数(MRSEI)的青海省都兰县生态环境质量评价

以1995、2005、2015年Landsat TM/ETM+/OLI影像为主要数据源,借助改进的遥感生态指数(MRSEI),对青海省都兰县近20年的生态环境状况进行监测和定量评价.结果表明:(1)1995-2015年,都兰县MRSEI均值从0.300增大到0.381,呈逐年递增趋势.结合MRSEI差值分析,1995-...

Evaluation of ecological environment in the Dulan County based on the Modified Remote Sensing Ecological Index Model

Based on the Landsat TM/ETM+/OLI images in 1995,2005 and 2015,and using MRSEI index,this research monitored and quantitatively evaluated the ecological environment of Dulan County,Qinghai Province over the past 20 years. The results showed that:(1)From 1995 to 2015,the average MRSEI of Dulan County increased from 0.300 to 0.381,showing an ascending trend year by year. Combined with MRSEI differential analysis,the proportion(41.76%)of areas with increased ecological grades was greater than that(9.14%)of areas with decreased ecological grades from 1995 to 2015,showing that the degree of environmental improvement was greater than that of environmental deterioration.(2)The ecological environment of Dulan County was affected by climate change and human activities. The areas with increased MRSEI levels were mainly concentrated in the east of the county benefiting from the government’s ecological protection policy and the warm-humid climate conducive to vegetation growth,while the areas with decreased MRSEI levels were mainly concentrated in the northwest and southwest of the county mainly due to the over-exploitation and over-grazing for the salt lake resources.(3)In the future economic development,we should follow the natural law,and rationally develop and utilize natural resources on the basis of effectively preserving the existing forest and grass vegetation.