地球信息科学

呼和浩特市生境质量对城市用地扩展的时空响应

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  • 内蒙古师范大学地理科学学院,内蒙古 呼和浩特 010022
冯琰玮(1994–),男,山西大同人,博士研究生,研究方向为城市地理与区域发展. E-mail:fengyanwei123@icloud.com

收稿日期: 2019-09-07

  修回日期: 2020-04-05

  网络出版日期: 2020-11-18

基金资助

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

Spatiotemporal response of habitat quality to urban expansion in Hohhot City

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  • College of Geography Science,Inner Mongolia Normal University,Hohhot 010022,Inner Mongolia,China

Received date: 2019-09-07

  Revised date: 2020-04-05

  Online published: 2020-11-18

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27 a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。

本文引用格式

冯琰玮, 甄江红, 马晨阳 . 呼和浩特市生境质量对城市用地扩展的时空响应[J]. 干旱区地理, 2020 , 43(4) : 1014 -1022 . DOI: 10.12118/j.issn.1000-6060.2020.04.16

Abstract

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.

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