遵义市城区用地扩张与景观生态风险耦合关系研究

Coupling Relationship Between Urban Land Expansion and Landscape Ecological Risk:A Case from Downtown Area of Zunyi City

以遵义市中心城区为研究对象,通过遥感影像、ArcGIS 10.2软件及数理统计的方法,借助城市扩张强度指数,研究1998—2018年其城市建设用地扩张变化特征;通过景观生态风险指数,分析其景观生态风险变化特征;基于地理加权回归模型,定量分析1998—2018年遵义市城区建设用地扩张与景观生态风险之间的耦合关系。结果表明:(1)20年间研究区城市建设用地呈现快速扩张,其中2013—2018年扩张速度最快,扩张主要沿着正北、正东、东南和西南方向扩张;(2)20年间,随着其城市建设用地面积增加,遵义市的景观生态风险值降低,低生态风险区面积逐年增多;(3)研究区建设用地面积和景观生态风险两者回归系数平均值逐年降低,两者总体上呈负相关关系,且负相关逐渐增强。研究结果为促进城市生态环境管理和可持续发展决策提供量化理论依据和数据支持。

Taking the downtown area of Zunyi city as the research object,we studied the change characteristics of urban construction land expansion in the research area from 1998 to 2018 by means of remote sensing image,ArcGIS software and mathematical statistics and urban expansion intensity index.Through landscape ecological risk index,the change characteristics of landscape ecological risk in the study area were analyzed.Based on the geographical weighted regression model,the coupling relationship between urban construction land expansion and landscape ecological risk in the study area from 1998 to 2018 was quantitatively analyzed.The results showed that:(1)Urban construction land in the study area has been expanding rapidly from 1998 to 2018,with the fastest expansion from 2013 to 2018,mainly along the directions of due north,east,southeast and southwest.(2)With the increase of urban construction land area in the study area,the landscape ecological risk value of the study area decreased,and the area of low ecological risk area increased year by year during these 20 years.(3)The average regression coefficient of the construction land area and landscape ecological risk in the study area decreased year by year,and they were negatively correlated with each other on the whole,and the negative correlation gradually strengthened.The research results could provide quantitative theoretical basis and data support for facilitating urban ecological environment management and sustainable development decision-making.