基于遥感生态指数模型的乌海市生态环境质量动态监测与分析

Dynamic Monitoring and Analysis of Ecological Environment in Wuhai City,based on the RSEI Model

由于资源的过度开发、城市的快速扩张,乌海市资源与环境的矛盾日益突出。为了说明乌海市的生态变化情况,为乌海市相关部门进行决策提供参考,基于遥感技术,对乌海市2005、2016年两期Landsat遥感影像进行处理,耦合了绿度、湿度、温度及干度4个指标建立遥感生态指数(RSEI)评价模型,对乌海市的生态环境质量进行监测与分析。研究结果显示:2005年乌海市RSEI均值为0.751,2016年乌海市RSEI均值为0.744,2005到2016年期间,RSEI值相近只略微减少。乌海市西北部和西南部生态环境质量呈现下降趋势;而由于各类生态环境保护政策的实施,乌海市东北部生态环境明显改善;乌海市其他地区生态环境变化趋势不大。由此表明近十年乌海市生态质量整体上保持较好,无过度恶化现象。

Owing to the over-exploitation of resources,the rapid expansion of cities and the fragile ecological environment,the contradiction between population,resources and environment in Wuhai City are becoming increasingly prominent.In order to illustrate the ecological changes of Wuhai City in the past ten years and provide reference for the relevant departments of Wuhai in ecological management and decision-making,the Landsat remote sensing images of Wuhai City in 2005 and 2016 were processed based on remote sensing technology.The remote sensing ecological index(RSEI)was established by coupling the four indexes of greenness,humidity,temperature and dryness.Thus,the monitoring and analysis of eco-environmental quality in Wuhai City from 2005 to 2016 is realized.The results show that the average RSEI value of Wuhai City in 2005 is 0.751,the average RSEI value of Wuhai City in 2016 is 0.744,and the RSEI value in 2005 to 2016 is only slightly reduced.Due to the inherent geographical environment and artificial mineral mining images,the ecological environment in the northwest and southwest of Wuhai City City has shown a downward trend;due to the implementation of various ecological environment protection policies,the ecological environment in the northeast of Wuhai City has improved significantly;the ecological environment in other areas of Wuhai City has not changed much.This indicates that the ecological quality of Wuhai City has been maintained as a whole in the past ten years,and there is no excessive deterioration.