基于地理国情数据的合肥市城镇扩展及其景观生态风险研究

Urbanization expansion and ecological risk in Hefei city based on geographical national conditions data

以合肥市2015年、2016年和2017年的地理国情数据为数据源,运用Arc GIS和Fragstats软件分析研究区2015—2017年的景观格局;基于景观格局指数评价法建立景观生态风险评价模型,并探讨城镇扩展强度与景观生态风险之间的线性关系。结果表明,2015—2017年间,合肥市景观格局变化显著,城镇用地、交通用地、工矿用地及水域面积总体呈增加态势,而耕地、园地、林地及草地面积总体呈减少态势。合肥市2015—2017年间的景观生态风险均处于极低状态,但随着城镇化进程的加快,期间的景观生态风险指数均呈上升趋势,景观生态安全的压力增大,且城镇扩展强度与景观生态风险之间呈显著的线性关系。

Based on the geographical data of 2015,2016 and 2017 in Hefei city,ArcGIS and Fragstats software was used to analyze the landscape pattern of the study area from 2015 to 2017.Based on the landscape pattern index evaluation method,the landscape ecological risk assessment model was established,and the linear relationship between urban expansion intensity and landscape ecological risk was discussed.The results showed that:during 2015-2017,the landscape pattern of Hefei city changed obviously.The area of urban land,traffic land,industrial and mining land and water increased.The area of cultivated land,garden land,forest land and grassland decreased.The landscape ecological risk in Hefei city was extremely low during 2015-2017.With the acceleration of urbanization,the landscape ecological risk index of the period showed an upward trend,the pressure of landscape ecological security increased,and there was a significant linear relationship between urban expansion intensity and landscape ecological risk.