水环境胁迫下的环鄱阳湖区城市化格局响应

RESPONSE OF URBANIZATION PATTERN SURROUNDING THE POYANG LAKE TO AQUATIC ENVIRONMENT STRESS

当前城市化和水环境问题已成为全球共同面临的富有挑战性的问题,选取环鄱阳湖区作为研究样区,借助GIS技术,采用空间统计方法并建立水环境胁迫模型,对这种水环境胁迫下的城市化格局响应进行了研究。研究表明:(1)综合城市化计算显示,环湖区的城市化格局是随着与鄱阳湖体距离的增大,其城市化水平呈现出先增大后减小趋势,表明湖泊对城市化影响总体上显现出与距离相关的非线性分异格局;(2)空间统计结果显示,水资源富集的环湖核心区的空间关联比较显著,其水质对城市化水平的胁迫作用比较明显;(3)水胁迫度比较表明,在环湖边缘区和外围区水环境对城市化的胁迫强度级别有明显差异,随着与鄱阳湖体距离的增大,水环境对城市化的胁迫力也增大,表现出"中心-外围"逐渐增大的阶梯变化趋势。

Water resource plays an important role in supporting the human society and the economic development.With an accelerating process of urbanization, contradiction between the urbanization and water environment is becoming prominent.In the present research, with the support of GIS technology,a spatial statistical method was used to establish water resources stress intensity （WRSI） model to explore the response of urbanization pattern around the Poyang Lake to the aquatic environment stress.The results are mainly as follows： （1）The Poyang Lake Area can be divided into three parts, i.e. core zone （0.412）, marginal zone （0.807） and peripheral zone （--0.072）.With the increase of the distance from the Poyang Lake, the urbanization level increases first and then decreases, demonstrating the important role of aquatic environment during the urbanization process. （2）Water quality exerts significant stress on the urbanization, lower urbanization level under worse water quality, while higher urbanization level under better water quality.（3）Water amount exerts significant influence on urbanization levels in the marginal and peripheral zones.The aquatic environment stresses on the urbanization are obviously different between the marginal and peripheral zones, the stress of water environment on urbanization increases with the increase of distance from the Poyang lake.