基于Sentinel-2卫星影像的乌鲁木齐市及典型光伏电站地表环境时空演变特征研究

doi:10.12118/j.issn.1000-6060.2025.634

Abstract

Abstract:

As a representative of urban surface environment evolution in arid regions of China, Urumqi City has experienced rapid urbanization and extensive photovoltaic construction, significantly affecting key surface parameters. Utilizing 10-m resolution remote sensing images from the Sentinel-2 satellite spanning 2019 to 2024, this study retrieved the surface albedo and normalized difference vegetation index (NDVI) of Urumqi City, analyzed their spatiotemporal variation characteristics, and examined the effects of photovoltaic facilities on surface albedo using the Midong 3.5 GW photovoltaic area as a case study. The results revealed the following: (1) From 2019 to 2024, Urumqi City’s overall albedo exhibited a year-by-year upward trend, with an average annual increase of 0.0197. In 2022, influenced by a prolonged extreme drought in Xinjiang, albedo rose sharply by 0.077, marking a 21.9% increase from the previous year. Seasonal analysis showed that winter had the highest albedo value of the year (0.516) due to snow cover, whereas summer recorded the lowest (0.280) due to vigorous vegetation growth. Spatially, significant increases in albedo were mainly observed in the foothills of the Tianshan Mountains in the southwest and the eastern wasteland, with smaller changes in the northern wasteland. (2) During the same period, the NDVI of Urumqi City showed an overall downward trend. Its seasonal variation was opposite that of albedo, with the lowest value in winter (0.024) and the highest in summer (0.142). In 2022, vegetation degradation peaked due to drought, with NDVI decreasing by 38.3% and the negative anomaly range significantly expanding, primarily affecting the areas around the city, the southwestern mountainous region, and the eastern wasteland. (3) Following the completion of the 3.5 GW photovoltaic area in Midong in 2024, the albedo in the core area covered by photovoltaic panels decreased by 11.6% compared to pre-construction levels, forming a distinct “low albedo zone”. Albedo in surrounding buffer zones also declined, though the overall average decline (3.3%) was less than that observed in the photovoltaic core area.

Key words: surface albedo, normalized difference vegetation index, spatial pattern, photovoltaic power station, buffer zone

ZHOU Teng, LIU Qiong, CHEN Yonghang, HE Ting, WU Jianguo, LIU Rui, XIU Qiang, XU Yunhong, SHAO Weiling, HAN Xueyun. Spatiotemporal evolution characteristics of surface environment in Urumqi City and typical photovoltaic power stations based on Sentinel-2 satellite imagery[J].Arid Land Geography, 2026, 49(10): 2065-2078.

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波段	分辨率/m	波长/nm	波段信息
B1	60	443	海岸气溶胶波段
B2	10	490	蓝光波段
B3	10	560	绿光波段
B4	10	665	红光波段
B5	20	705	红光波段1
B6	20	740	红光波段2
B7	20	783	红光波段3
B8	10	842	近红外波段
B9	60	945	水汽波段
B11	20	1610	短红外波段1
B12	20	2190	短红外波段2

编号	土地类型	描述
0	水体	永久性和季节性水体
1	树木	原生林和次生林以及大型人工林
2	草地	天然草原、畜牧场和公园
3	被淹没的植被	红树林和其他被淹没的生态系统
4	农田	行作物和水稻作物
5	落叶灌木/灌丛	灌木组成的稀疏到密集的开阔植被
6	建成区/城市	建筑物、道路和城市开放空间
7	裸地	沙漠和裸露的岩石
8	雪/冰	永久和季节性积雪

波段	权重系数
B2	0.1550
B3	0.2375
B4	0.2244
B8	0.3579

Spatiotemporal evolution characteristics of surface environment in Urumqi City and typical photovoltaic power stations based on Sentinel-2 satellite imagery

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