摘要
区域经济发展极大地推动了城镇建设用地的扩张,同时也给区域的生态安全带来潜在的威胁[1]。本研究以重庆市中心城区为例,运用GIS地理空间分析和数据定量统计分析相结合的方法,获取以林地和水域为主要代表因子的生态安全格局在城镇扩张过程中的变化特征,并分析其潜在的影响。研究表明:(1)景观指数值的变化可以反映出区域生态安全格局的大致变化特征,在城镇化过程中景观指数与城镇扩张水平呈现出的响应度差异,可以为其他区域的生态安全格局研究指数的选取提供参考。(2)在不同行政区划下,斑块聚合度的响应程度和相关性最为显著,响应度指数之间的差异表明前者对后者的影响是从局域到整体的一个渐进过程。(3)分别在两种生态功能区划内,研究城镇扩张对生态安全格局景观指数的影响程度、相关性大小及差异,发现在都市核心污染敏感生态功能区(Ⅱ1-1)内,PLAND与城镇扩张指数PD-U正相关,LPI也呈现正相关,其分布规律的异质性可能是由于在区域内进行人为干扰增加生态景观造成的。在市郊水源水质保护生态区(Ⅱ1-2)内,因生态管控等原因,市郊的水源水质保护生态区成为城镇向郊区扩张的最大阻力,其负相关趋势的原因有待进一步分析研究。
Regional economic development not only greatly promoted the expansion of urban construction land,but also brought a potential threat to the regional ecological security.Taking the central urban area of Chongqing as an example(including nine administrative regions),this paper used the methods of GIS geo-spatial analysis and data quantitative statistical analysis to obtain the changing characteristics of the ecological security pattern of woodland and water,which were the main representative factors in the process of urban expansion,and to analyze its potential effects.The results were shown as follows:(1)Changes in landscape index values reflected the general variation characteristics of the regional ecological security pattern.In the process of urbanization,the differential responsiveness between landscape index and urban expansion levels provided a valuable reference for the selection of the ecological security pattern index in other regions.(2)Under different administrative divisions,the response degree and correlation of plaque aggregation were the most significant.The differences between the responsiveness indices suggested that the former affected the latter as a gradual process from local to overall.(3)Within two distinct ecological function divisions,the degree of influence,correlation and differences of urban expansion on the ecological security pattern landscape index were studied.It was concluded that within urban core pllution sensitive ecological functional area(Ⅱ1-1),PLAND was positively correlated with urban expansion index PD-U,and LPI also exhibited a positive correlation.The heterogeneity of its distribution law was likely attribute to increased artificial interference affecting the ecological landscape within the region.Conversely,within suburban water quality protection ecological zone(Ⅱ1-2),due to ecological control and other factors,the ecological zone designated for water quality protection in the suburbs became the primary obstacle to urban expansion into the suburbs,but its negative correlation trend required further analytical investigation.
作者
韦振锋
梁珊珊
黄群英
WEI Zhenfeng;LIANG Shanshan;HUANG Qunying(Economics and Trade College,Guangxi University of Finance and Economics,Nanning 530007,Guangxi,China)
出处
《国土资源科技管理》
2024年第5期53-70,共18页
Scientific and Technological Management of Land and Resources
基金
国家自然科学基金项目(72364001)
广西高校中青年教师科研基础能力提升项目(2018KY0522)
广西财经学院经济与贸易学院资助项目(2024XKA03)。
关键词
城镇扩张
生态安全
景观格局指数
驱动特征
重庆
urban expansion
ecological security
landscape pattern index
driving characteristics
Chongqing