近十年遂宁市生态环境状况动态评价

Dynamic Evaluation of Eco-environmental Status of Suining City in the Last Decade

为了解2010—2019年遂宁市生态环境状况及变化规律,利用遥感卫星影像数据,采用人机交互遥感解译和统计方法,动态评价了遂宁市生态环境状况及5个二级分指数的变化趋势,并分析了主要影响因素。结果表明:遥感解译总体精度大于94%;遂宁市主要土地利用类型为耕地和林地,10年间其结构没有发生根本性变化;在评价期内,遂宁市及其5个县(市、区)的生态环境状况均为良,生态环境状况指数累计变化量0.88,属无明显变化级别,生态环境状况总体稳定,且呈现出向好态势;生态环境状况指数及变化值与土地胁迫指数、污染负荷指数呈负相关,与生物丰度指数和水网密度指数呈正相关。评价结果显示,近10年来遂宁市生态环境状况总体稳中向好。

To understand the eco-environmental status of Suining city and its change rule in the last decade,the methods of human-computer interaction remote sensing interpretation and statistical analysis with the aid of remote sensing satellite image data are employed to dynamically evaluate the change trends of its ecological environment and five sub-indexes,and analyze the major influencing factors as well.The results demonstrate that the overall accuracy of remote sensing interpretation has reached above 94%;the main land use types of the whole city are arable land and woodland,without any fundamental structure change in the last decade;the level of ecological environment status of Suining city and its five counties(cities,districts)during the evaluation period are all ranked as very good and the cumulative change of eco-environmental index is 0.88,belonging to the level of no obvious change;the eco-environmental status is generally stable,showing a positive trend.The eco-environmental status index and its change value are negatively correlated with the land stress index and the pollution load index,but positively correlated with the biological abundance index and the water network density index.The evaluation results show that the general eco-environmental status of Suining city has remained stable with good momentum in the last decade.