呼和浩特市生境质量对城市用地扩展的时空响应

doi:10.12118/j.issn.1000-6060.2020.04.16

摘要/Abstract

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。

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

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.

Key words: new urbanization, habitat quality, urban expansion, InVEST model, Hohhot City

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.

FENG Yan-wei, ZHEN Jiang-hong, MA Chen-yang. Spatiotemporal response of habitat quality to urban expansion in Hohhot City[J]. Arid Land Geography, 2020, 43(4): 1014-1022.

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