甘肃省庆阳市2000-2015年生态环境状况变化分析

Analysis of ecological environment changes from 2000 to 2015 in Qingyang, Gansu Province

以2000、2010和2015年3期的1∶100 000土地利用数据、多源遥感数据以及相关统计数据为数据源,参考2015年发布的《生态环境状况评价技术规范》,选择生物丰度指数、植被覆盖指数、水网密度指数和土地胁迫指数对甘肃省庆阳市的生态环境状况进行了评价.结果表明:从2000到2015年,庆阳市的生物丰度指数基本未变,植被覆盖指数和水网密度指数不断增大,土地胁迫指数不断减小; 15 a间庆阳市整体的生态环境状况处于"一般"的等级,但生态环境状况指数(EI)增加明显,呈现出稳中变好的趋势.其中宁县和正宁县的生态环境状况等级由"一般"转变为"良好",其他各县虽然保持"一般"的等级,但EI值均有增加的趋势.

Taking the 1∶100 000 land use data of 2000, 2010 and 2015, multi-source remote sensing data and related statistical data as data sources, referencing to the 'Technical Criterion for Ecosystem Status Evaluation' and selecting the biological richness index, vegetation coverage index, water network denseness index and land stress index, the ecological environmental condition of Qingyang was evaluated and the results showed that the biological richness index of Qingyang was basically unchanged from2000 to 2015, the vegetation coverage index and water network denseness increased continuously and the land stress index was decreasing. In the past 15 years, the overall ecological environment of Qingyang was at a 'general' level, but the value of the ecological index(EI) increased significantly during the period, showing a steady change for a better trend. The level of ecological environment of Ningxian and Zhengning counties changed from 'general' to 'good', while other counties stayed on the 'general' level,and the value of EI had an increasing trend.