四川盆地植被EVI动态变化及其驱动机制

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Abstract This study took the Sichuan Basin as the study area. MOD13A3EVI time series, climate data, land use type data, and nighttime light data were obtained, and Thile-Sen Median analysis, correlation analysis, multi-collinearity test, residual analysis, and relative analysis were utilized to explore the spatial-temporal variation of vegetation EVI and the driving mechanism of vegetation EVI in the Sichuan Basin from 2000 to 2020. Results showed that the vegetation EVI in 83.81% of the Sichuan Basin showed an upward trend from 2000 to 2020, which were concentrated in the central and eastern of the Sichuan Basin. Accounting for 16.19% of the vegetation EVI in the Sichuan Basin exhibited downward trends, which were mainly located in the Chengdu and Chongqing metropolitan areas and sparsely distributed in other regions. At the city scale, except for a downward trend of vegetation EVI observed in Chengdu, the vegetation EVI of all cities in the Sichuan Basin showed an upward trend. Vegetation EVI variation in the Sichuan Basin was dual-regulated by climate change and the effects of climate change to vegetation EVI showed obvious regional differences. At the regional scale, vegetation EVI was positively correlated with minimum temperature and precipitation, but negatively correlated with atmosphere pressure in the Sichuan Basin. In addition, vegetation EVI had the highest correlation with precipitation. The area where minimum temperature and precipitation promoted vegetation growth in the Sichuan Basin was greater than that with inhibitory effect, while the area where air pressure had an inhibitory effect on vegetation growth in the Sichuan Basin was greater than the area with promoting effect. The combined impact of precipitation, minimum temperature, and atmosphere pressure on vegetation EVI variation was greater that other climatical-driving types. Human activities exhibited dual effect on vegetation EVI variation, and the positive effect was greater than the negative effect. Urban expansion and population increase leading to the increase of construction land and the massive transfer of forest land to cultivated land, respectively, had degraded the vegetation EVI. Meanwhile, the development of agriculture and forestry and implementation of ecological engineering leading to the increase of forest land and the massive transfer of grassland to cultivated land, respectively, had improved the vegetation EVI.Vegetation EVI increase was mainly driven by the combined effect of climate change and human activities. Furthermore, the impact of climate change on vegetation EVI increase was greater than that of human activities, and the impact of human activities on vegetation EVI decrease was greater than that of climate change. The research result can provide a theoretical reference for dynamic vegetation monitoring and eco-environmental quality assessment in the Sichuan Basin.

Key words： the Sichuan Basin enhanced vegetation index multi-collinearity test relative analysis driving mechanism

Received: 06 January 2023

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	DAI Qiang-yu
	XU Yong
	ZHAO Chun
	LU Yun-gui
	HUANG Wen-ting

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DAI Qiang-yu,XU Yong,ZHAO Chun等. Dynamic variation of vegetation EVI and its driving mechanism in the Sichuan Basin[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 4292-4304.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/4292

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