天山北坡经济带植被覆盖度动态变化研究

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Abstract To investigate the spatial and temporal changes in vegetation cover and its causes in the economic zone on the northern slopes of Tianshan Mountain. This study is based on MODIS13Q1NDVI data, meteorological data, topographic data and humanities data, based on the Google Earth Engine (GEE) platform, the Theil-Sen Median trend analysis, Mann-Kendall significance test and stability analysis methods were used to explore the Fractional Vegetation Cover (FVC) of the economic zone on the northern slopes of Tianshan Mountain from 2000 to 2020 spatial and temporal change characteristics and its influencing factors. The results of the study indicates that:The FVC of the economic zone on the northern slope of Tianshan Mountain was characterized by two parallel zones of high cover. Among them, the central area was characterized by high vegetation cover, while the edge area was marked by relatively low vegetation cover. The FVC of the economic zone on the northern slope of Tianshan Mountain exhibited a mild spatial and temporal variation between 2000 and 2020, accounting for approximately 70% of the total changes. The vegetation improvement area primarily showed a zonal distribution and was concentrated in the central part of the study area, while the vegetation reduction area was mainly distributed in the southern edge of the study area. Overall, the vegetation cover of the northern slopes of Tianshan showed an interphase distribution trend from northwest to southeast and a gradual increase. In comparison with the eastern region, the vegetation improvement in the western region was more pronounced. During 2000 to 2020, high stability and small fluctuations overall were exhibited by the FVC of the economic zone on the northern slope of Tianshan Mountain, and its variability was characterized by weak to moderate variability. However, strong variability in FVC was observed in northern Karamay, southwestern Urumqi, and scattered areas along the southern edge of the study area. The factors influencing FVC in the economic zone of the northern slope of Tianshan Mountain were revealed to be studied through the geodetector model, indicating that the main explanatory factors for the spatial differentiation of FVC were human activities (population density, nighttime lighting, and land use type). In terms of drivers, FVC was found to be most impacted by population density, with a p-value of 0.283, followed by nighttime lighting with a p-value of 0.125, and land use type with a p-value of 0.179.

Key words： GEE MODIS13Q1 fractional vegetation cover spatial-temporal change geodetector northern slopes of Tianshan Mountains

Received: 29 June 2023

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	HAO Xin-yi
	ZHANG Zhe
	ZHENG Hao
	GAO Ning-zhen

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HAO Xin-yi,ZHANG Zhe,ZHENG Hao等. Dynamic change of vegetation cover in the economic zone of the northern slopes of Tianshan Mountains[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(2): 1020-1031.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I2/1020

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