Cold island effect of typical oasis landscape pattern in arid region

doi:10.7522/j.issn.1000-694X.2025.00013

Journal of Desert Research ›› 2025, Vol. 45 ›› Issue (6): 12-25.DOI: 10.7522/j.issn.1000-694X.2025.00013

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Cold island effect of typical oasis landscape pattern in arid region

Xinru Deng¹(), Qiang Bie¹^,²^,³(), Chunlin Huang⁴, Ying Shi¹, Xinzhang Li¹

^1.Faculty of Geomatics /, Lanzhou Jiaotong University，Lanzhou 730070，China
^2.National-Local Joint Engineering Research Center of Technologies and Applications for National Geographic State Monitoring, Lanzhou Jiaotong University，Lanzhou 730070，China
^3.Post-doctorate Workstation，Sanhe Digital Surverying and Geographic Information Technology Company，Tianshui 741000，Gansu，China
^4.Key Laboratory of Remote Sensing of Gansu Province，Northwest Institute of Eco-Environment and Resources，Chinese Academy of Sciences，Lanzhou 730000，China

Received:2024-12-24 Revised:2025-02-25 Online:2025-11-20 Published:2025-11-26
Contact: Qiang Bie

Abstract

Abstract:

The oasis cool island effect plays a significant role in ensuring human health， safety， and livability in oasis areas. This study focuses on four typical oases in arid regions （Aksu， Hotan， Wuwei， and Zhangye）， using Landsat imagery to retrieve land surface temperature， and validating the results with ground climate data. The analysis explores the intensity and spatiotemporal variations of the cool island effect in these oases， while investigating the impact of land cover and landscape patterns on the cool island effect by combining land cover data and landscape pattern indices. The results indicate that：（1） During 2000-2020 the oasis areas in the study region expanded， with a significant increase in the cool island area of Aksu Oasis， while the cool island area of Wuwei Oasis decreased. However， the overall cool island effect （OICE） index of all oases increased， indicating a strengthened cool island effect. （2） In all oases， cultivated land， forest land， and built-up areas expanded， while barren land decreased. The expansion of cultivated land in Aksu Oasis enhanced the cool island effect； the expansion of cultivated land in Hotan Oasis extended the cool island range； the expansion of built-up areas in Wuwei Oasis weakened the cool island effect； and the optimization of land cover structure in Zhangye Oasis enhanced the cool island effect. （3） The driving mechanisms of OCIE varied across oases. In Aksu and Hotan， OCIE was mainly driven by patch area percentage （PLAND）， with higher land cover concentration enhancing the effect. In Wuwei， OCIE was influenced by PLAND， edge density （ED）， and mean shape index （SHAPE_MN）， with ED making significant contributions in peripheral regions. In Zhangye， SHAPE_MN was the primary driver， while PLAND showed a suppressive effect.

Key words: oasis cold island effect, landscape pattern, arid zone oasis, land cover, temporal and spatial variation

CLC Number:

P941.73

Xinru Deng, Qiang Bie, Chunlin Huang, Ying Shi, Xinzhang Li. Cold island effect of typical oasis landscape pattern in arid region[J]. Journal of Desert Research, 2025, 45(6): 12-25.

Figures/Tables 14

References 34

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指数	分类标准	分类方法
OCIE	无绿洲冷岛效应	LST_o≥LST_d
	弱绿洲冷岛效应	LST_d-2.5 ℃≤LST_o<LST_d
	中绿洲冷岛效应	LST_d-5 ℃≤LST_o<LST_d-2.5 ℃
	强绿洲冷岛效应	LST_o<LST_d-5 ℃

指数	分类标准	分类方法
OCIE	无绿洲冷岛效应	LST_o≥LST_d
	弱绿洲冷岛效应	LST_d-2.5 ℃≤LST_o<LST_d
	中绿洲冷岛效应	LST_d-5 ℃≤LST_o<LST_d-2.5 ℃
	强绿洲冷岛效应	LST_o<LST_d-5 ℃

指数名称	缩写	生态学含义
斑块面积百分比	PLAND	某一类型斑块占景观总面积百分比，反映景观类型的相对重要性和覆盖程度
最大斑块指数	LPI	衡量景观中最大斑块的相对重要性和占主导地位的程度
斑块密度	PD	单位面积内景观斑块的数量，反映景观的破碎程度
边缘密度	ED	斑块的周长总和与景观总面积的比值，反映斑块形状及边缘效应
平均斑块面积	AREA_MN	反映景观中斑块的平均大小，影响生态过程的规模和强度
平均形状指标	SHAPE_MN	描述斑块的平均形状复杂度，形状越复杂，形状指数越高
斑块内聚力指数	COHESION	描述斑块的空间结构，值越高，斑块内部越连贯

指数名称	缩写	生态学含义
斑块面积百分比	PLAND	某一类型斑块占景观总面积百分比，反映景观类型的相对重要性和覆盖程度
最大斑块指数	LPI	衡量景观中最大斑块的相对重要性和占主导地位的程度
斑块密度	PD	单位面积内景观斑块的数量，反映景观的破碎程度
边缘密度	ED	斑块的周长总和与景观总面积的比值，反映斑块形状及边缘效应
平均斑块面积	AREA_MN	反映景观中斑块的平均大小，影响生态过程的规模和强度
平均形状指标	SHAPE_MN	描述斑块的平均形状复杂度，形状越复杂，形状指数越高
斑块内聚力指数	COHESION	描述斑块的空间结构，值越高，斑块内部越连贯

绿洲	参数	PLAND	LPI	PD	ED	AREA_MN	SHAPE_MN	COHESION
阿克苏	Moran's I	-0.340^**	-0.028^**	0.101^**	0.094^**	0.055^**	-0.139^**	-0.032^**
阿克苏	相关系数	-0.054^*	-0.047^*	0.127^**	0.125^**	0.060^**	-0.184^**	-0.049^*
和田	Moran's I	0.268^**	0.248^**	-0.194^**	-0.385^**	0.343^**	-0.301^**	0.048^**
和田	相关系数	0.362^**	0.344^**	-0.241^**	-0.468^**	0.412^**	-0.372^**	0.239^**
武威	Moran's I	0.332^**	0.324^**	-0.180^**	-0.410^**	0.397^**	-0.339^**	0.225^**
武威	相关系数	0.375^**	0.364^**	-0.159^**	-0.461^**	0.439^**	-0.415^**	0.236^**
张掖	Molan's I	0.195^**	0.207^**	-0.048^**	-0.175^**	0.255^**	-0.299^**	0.144^**
张掖	相关系数	0.202^**	0.216^**	-0.004^**	-0.176^**	0.278^**	-0.389^**	0.142^**

Cold island effect of typical oasis landscape pattern in arid region

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Figures/Tables 14

References 34

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绿洲	PLAND	LPI	PD	ED	AREA_MN	SHAPE_MN	COHESION
阿克苏	显著	显著	不显著	显著	显著	显著	不显著
和田	显著	不显著	显著	显著	不显著	显著	显著
武威	显著	显著	显著	显著	显著	显著	不显著
张掖	显著	显著	显著	显著	显著	显著	显著

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