城镇化过程中干旱区绿洲与绿洲城市空间协同演变及其模式分析

doi:10.12118/j.issn.1000-6060.2024.746

Abstract

Abstract:

As the core spatial units of oasis systems—hosting concentrated population functions, economic activities, and public services—the expansion of oasis cities is constrained by ecological patterns while simultaneously driving oasis evolution. Systematically identifying the spatial-temporal evolution of oasis and oasis cities is fundamental for coordinating ecological protection and spatial development in arid zones. This study delineates the spatial distribution of oasis in northwest China from 2000 to 2023 using evapotranspiration and the normalized difference vegetation index, while urban expansion data are extracted from the annual China land cover dataset. A synergy assessment is conducted by constructing an oasis and city synergy index (OCSI) to quantify the coordination between oasis and urban expansion across 31 typical oasis cities. Further, the impacts of various urban expansion patterns on oasis landscape structures are classified. The findings reveal that: (1) From 2000 to 2023, oasis areas increased by 0.90×10⁵ km², representing a 36.89% expansion. Concurrently, the number of oasis patches declined from 135 to 101, indicating a trend toward larger and more consolidated oasis, mainly through edge expansion and infilling. Urban areas expanded by 4.34×10³ km²—a 361.60% increase—outpacing oasis growth. Urban spatial expansion was categorized into four patterns: Infilling, edge expansion, leapfrogging, and river-dependent expansion. (2) OCSI analysis indicates that the urban and oasis expansion rates were similar in 8 cities, while critical disparities existed in the remaining 23. Terrain complexity and resource limitations contributed to mismatches, whereas economically developed or well-managed cities exhibited higher synergy levels. (3) Cities dominated by edge or infilling expansion modes displayed higher OCSI values, reflecting stronger spatial synergy with oasis expansion. By contrast, cities characterized by leapfrogging or river-dependent expansion showed low and fluctuating synergy owing to their dispersed spatial patterns or linear development along water bodies. This study elucidates the complex spatial interaction between urban development and oasis evolution in the northwest arid zone. Although these processes are dynamically coupled, coordinated development does not spontaneously occur. Achieving sustainable long-term balance necessitates region-specific strategies to optimize urban and oasis spatial configurations, thereby fostering synergistic evolution and ensuring ecological security and sustainable development in arid regions.

Key words: oasis, oasis city, synergy index, expansion model, arid zone of northwest China

HAN Yuchen, SUN Qinke, ZHOU Liang, LI Yu’ang. Spatial synergistic evolution of oasis and oasis cities in arid zones in the process of urbanization and analysis of their patterns[J].Arid Land Geography, 2025, 48(8): 1469-1479.

Figures/Tables 8

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References 39

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年份	绿洲		无绿洲		总体精度	卡帕系数
年份	生产者精度	使用者精度	生产者精度	使用者精度	总体精度	卡帕系数
2000	83.17	80.36	98.32	98.61	97.17	0.80
2005	92.52	83.13	96.60	98.62	95.97	0.85
2010	81.88	84.45	98.61	98.33	97.19	0.82
2015	87.17	92.97	97.93	96.04	95.36	0.87
2020	81.15	99.75	99.79	84.11	90.47	0.81

扩张模式	典型城市	协同趋势类型	OCSI均值	协同度等级	Δ_OCSI	稳定性等级	综合协同度
沿河扩张	伊犁州直	趋势相反型	1.39	低	0.96	中	低协同
	金昌市	趋势相反型	1.10	中	0.69	中
	阿克苏地区	趋势相反型	1.58	低	1.67	低
填充扩张	张掖市	趋势相似型	1.13	中	0.66	中	高协同
	酒泉市	趋势相似型	1.09	高	0.52	高
	吐鲁番市	趋势相反型	1.03	高	0.37	高
边缘扩张	乌鲁木齐市	趋势相反型	1.05	高	0.46	高	高协同
	克拉玛依市	趋势相反型	.09	高	0.73	中	高协同
跳跃扩张	阿拉善盟	趋势相似型	1.17	中	0.70	中	中协同

Spatial synergistic evolution of oasis and oasis cities in arid zones in the process of urbanization and analysis of their patterns

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