呼和浩特市生境质量对城市用地扩展的时空响应  

Spatiotemporal response of habitat quality to urban expansion in Hohhot City

作　　者：冯琰玮 甄江红[1] 马晨阳 FENG Yan-wei;ZHEN Jiang-hong;MA Chen-yang(College of Geography Science lnner Mongolia Normal Universily,Hohhot 010022,Inner Mongolia.China)

机构地区：[1]内蒙古师范大学地理科学学院,内蒙古呼和浩特010022

出　　处：《干旱区地理》2020年第4期1014-1022,共9页Arid Land Geography

基　　金：国家自然科学基金项目(41761032,41261109);内蒙古自然科学基金项目(2016MS0410)资助。

摘　　要：以呼和浩特市为研究区,采用梯度分析法,结合InVEST模型,在评价研究区近27a城市用地扩展及生境质量演变的基础上,运用双变量空间自相关剖析生境质量对城市用地扩展的时空响应。结果表明:(1)研究时段内,城市扩展表现为核心区的低密度扩张及外围区的多点扩散,紧凑度不断下降,城市结构不稳定,扩展模式不尽合理。(2)生境平均值从0.49下降到0.44,质量等级跌至较差水平。低等级生境主要呈圈层向南部、东南部扩散,与建设用地扩展方向基本一致。(3)建设用地扩展强度与生境质量变化空间分布呈负相关关系,核心外围区的建设用地扩展始终为变化最强烈的地带,生境质量退化也最为剧烈。(4)斑块密度不断上升,特别是建设用地斑块的增加使得城市景观格局愈发破碎。This paper evaluated the evolution of urban expansion and habitat quality in the Hohhot City,Inner Mongolia,China from 1990 to 2017 using gradient analysis and an InVEST model. A bivariate spatial auto-correlation was employed to ascertain the impact of urban expansion on habitat quality. The results showed that urban expansion during the period was characterized by low-density expansion in core areas and multi-point diffusion in periphery areas. The urban areas became less compact and stable,exhibiting uneven development. Secondly,the average habitat value decreased from 0.49 to 0.44,and the quality dropped to a worse level. Low-grade habitats primarily diffused to the south and southeast in a circular layer,which is consistent with the direction of construction expansion. Thirdly,there was a negative spatial correlation between the change in urban expansion and habitat quality.This is because urban expansion in the core-periphery areas remains the most intense changing zones where habitat quality degradation happen. In addition,there is a rising trend in the density of patches and an increasing use of patches during construction,which have aggravated the fragmented urban landscape.

关 键 词：新型城镇化 生境质量 城市用地扩展 InVEST模型 呼和浩特市 

分 类 号：X821[环境科学与工程—环境工程] F299.23[经济管理—国民经济]