生态安全约束下环鄱阳湖生态城市群空间格局演变研究

基于改进引力模型和PSR模型探究了2008—2018年在生态安全约束下环鄱阳湖生态城市群时空演化格局,通过障碍度模型分析最大障碍因子,结果表明:(i)环鄱阳湖生态城市群整体生态安全处于风险级,地域分异特征明显,形成以鄱阳湖为中心向四周递减的生态安全格局;(ii)生态安全障碍度总体呈减小态势,各个城市最大障碍因子多数集中在压力要素层,且障碍度较高的市辖区的最大障碍因子障碍度普遍偏高,且稳定性最为明显;(iii)经济引力不断增强,但内部差异逐渐增大,呈“向心性”发展,“廊道效应”明显; 生态引力呈摊饼式“团块状”展开,小组团逐渐连接向集中连片发展; 2种引力存在较大的差异,且不和谐程度问题具有“马太效应”.

The Spatial Pattern Evolution of the Eco-Urban Agglomeration Around Poyang Lake Under the Constraint of Ecological Security

Based on the improved gravity model and PSR model,the spatial and temporal evolution pattern of ecological urban agglomeration around Poyang Lake under the constraint of ecological security during 2008—2018 is explored,and the biggest obstacle factor is analyzed by the obstacle degree model.The results show that the overall ecological security of the eco-urban agglomeration around Poyang Lake is at the risk level,and the regional differentiation is obvious,forming an ecological security pattern of decreasing from the center to the periphery of Poyang Lake.The degree of ecological security obstacle is generally reduced,and most of the biggest obstacle factors in each district and county are concentrated in the pressure factor layer,and the degree of the biggest influence factors in the city district with higher obstacle degree is generally higher,and the stability is the most obvious.The economic gravity is increasing,but the internal differences are gradually increasing,showing "centripetal" development and obvious "corridor effect".The ecological gravity unfolds in the form of "lumpy",gradually connecting to concentrated contiguous development.There are great differences between the two kinds of gravity,and the degree of disharmony has a "Matthew effect".