城乡生态质量对经济快速增长区建设用地扩张的响应——以合肥为例北大核心CSCD

21世纪以来,中国经济增长促进了城市化进程的快速发展,也在一定程度上带来一系列环境问题。本文以合肥为例,选用2002、2010、2020年的Landsat系列影像,利用改进的遥感生态指数(MRSEI),并引入城市扩张强度、城市重心转移模型等,探讨了城乡生态变化对建设用地扩张的响应。结果表明:2002—2020年合肥市主城区与周边乡镇生态环境质量总体呈恶化趋势,其中周边乡镇MRSEI均值由2002年的0.747下降至2020年的0.495,降幅为33.7%,主城区MRSEI均值由2002年的0.669下降至2020年的0.491,降幅为28.73%;周边乡镇生态质量下降幅度高于主城区,建设用地扩张强度大于主城区,生态破损更为严重。生态环境恶化区域主要由主城区向周边乡镇放射性分布,生态环境变好的区域主要集中在老城区周围,而城市扩张的区域与MRSEI评价结果显示的生态环境恶化区域基本重合,生态环境变化与城市建设用地扩张强度呈明显的负相关关系。

The response of urban and rural ecological quality to the expansion of construction land in rapid economic growth zone: taking Hefei as an enample

Since the 21st century, China's economic growth has promoted the rapid development of urbanization, but also brings a series of environmental problems to a certain extent. Taking Hefei in Anhui province, one of the fast economic-developing in the Yangtze River Delta region, as a study area, based on Landsat images of 2002, 2010 and 2020, this paper discusses the response of urban and rural ecological changes to the expansion of construction land by using improved remote sensing ecological index and introducing urban expansion intensity and urban center of gravity center displacement model. The results show that: From 2002 to 2020, the ecological environment quality of the main urban area and surrounding towns of Hefei show a general deteriorating trend. The average MRSEI of surrounding towns decreases from 0.747 in 2002 to 0.495 in 2020, a decrease of 33.7%. The average MRSEI of the main urban area decreases from 0.669 in 2002 to 0.491 in 2020, a decrease of 28.73%. The decline in the ecological quality of surrounding towns is higher than that of the main urban area, the expansion of construction land is stronger than that of the main urban area, and the ecological damage is more serious. The deteriorating ecological environment is mainly distributed radially from the main urban area to the surrounding towns. The areas with improved ecological environment are mainly distributed around the old urban area. The areas of urban expansion and the deteriorating ecological environment shown by the MRSEI evaluation results basically coincide, and the ecological environment changes have a obviously negative correlation with the expansion intensity of urban construction land.