城市用地扩展对生态安全的影响——以内蒙古自治区呼和浩特市为例  

EFFECTS OF URBAN LAND EXPANSION ON ECOLOGICAL SECURITY——Take Inner Mongolia Autonomous Region Hohhot City as an example

作　　者：甄江红[1] ZHEN Jianghong(College of Geography Science, Inner Mongolia Normal University, Hohhot 010022, China)

机构地区：[1]内蒙古师范大学地理科学学院,呼和浩特010022

出　　处：《内蒙古农业大学学报（自然科学版）》2018年第3期52-59,共8页Journal of Inner Mongolia Agricultural University(Natural Science Edition)

基　　金：国家自然科学基金项目(41761032);内蒙古自然科学基金项目(2016MS0410)

摘　　要：城市空间扩展对生态环境的影响研究备受关注。为正确认识城市用地扩展导致的生态安全问题,以1986—2014年遥感影像为信息源,基于城市用地扩展特征及其生态效应分析,借助DPSIR模型构建生态安全评价指标,开展呼和浩特城市用地扩展中生态安全的动态评价与趋势分析。结果表明:28a间,呼和浩特市建成区面积扩大2.89倍,生态用地减少16.71%,热岛比例指数升高0.40倍,破碎度指数增加0.82倍,生态系统服务价值降低7.32%;生态安全指数从0.747 0降至0.309 6,生态安全水平由"较安全"转变为"很不安全"等级。可见,呼和浩特城市用地扩展已对生态环境造成压力,生态安全状况不断恶化。研究结果可为有效遏制城市用地扩张对生态安全的负面影响提供理论依据。The impact of urban spatial expansion on the ecological environment and its response has been paid much attention. In order to have a correct understanding of the ecological security problems caused by the expansion of urban land, the paper analysis the dynamic features and eco - environmental effect of urban land expansion in Hohhot City based on the remote sensing image of 1986 - 2014. The ecological security evaluation index system was constructed based on DPSIR model, and the dynamic change of ecological security level in the process of urban land expansion in Hohhot City was evaluated and analyzed in the paper. Results show： During 28 years, the built -up area in Hohhot City expanded 2.89 times, the ecological land area reduced 16.71% , the heat island ratio rise 0.40 times, fragmentation index increased 0.82 times, ecosystem service value decreased 7.32%. This led to the ecological se- curity index fell from 0. 747 0 to 0. 309 6, the level of ecological security is changed from ＂safer＂ to ＂unsafe＂. Obviously, the expan- sion of urban land in Hohhot has caused great pressure on the ecological environment and make the ecological security situation is de- teriorating. The results can provide a theoretical basis for effectively curbing the negative effects of urban land expansion on ecological security.

关 键 词：城市用地扩展 生态环境效应 DPSIR模型 生态安全评价 呼和浩特市 

分 类 号：X321[环境科学与工程—环境工程]