2001~2021年中国NDVI时空格局变化及对气候的响应

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Abstract Based on the MODIS MOD13A3 dataset and climate data to analyze the spatio-temporal variations of NDVI in the nine major basins in China from 2001 to 2021 by statistical methods of linear regression, Theil-Sen trend and Mann-Kendall significance test. Further, the responses of NDVI to precipitation, air temperature, solar radiation and saturated water pressure difference in the nine major basins in China were investigated by using Geodetector analysis. The results showed that NDVI showed a significant upward trend (P<0.05) both in China and the nine major river basins from 2001 to 2021. The change rate of NDVI in the Yangtze River Basin, the Pearl River Basin, the Southeast River Basin and the Huaihe River Basin was the largest in winter, the Haihe River Basin in spring, the Southwest River Basin in autumn, and the other river basins in summer. From the perspective of land use change types, the NDVI change rate was ranking in the order of non-urbanized area (0.0026/a) > non-type change area (0.0021/a) > urbanized area (0.0013/a). Moreover, the NDVI of the urbanization areas was degraded in the Southeast River Basin and the Southwest River Basin. Spatially, the change rate of NDVI decreased from east to west and from south to north. The areas with stable vegetation growth accounted for 26.43% of the total area of China, mainly concentrated in the Inland River Basin and the northwest of the Southwest River Basin. The areas with vegetation improvement accounted for 70.31%, mainly distributed in the non-urbanized area of the nine major river basins. The area with vegetation degradation accounted for 3.25%, which was concentrated in the north of the Inland River Basin, the east of the Southwest River Basin, the west of Yangtze River Basin and the coastal basins in the east China. The factor detection results showed precipitation was the main factor controlling the spatial distribution of NDVI across China, followed by air temperature, saturated water pressure difference and solar radiation. In most of the nine river basins, precipitation was still the main determinant, but the saturated water pressure difference was the main determinant in the Yangtze River Basin, the Pearl River Basin and the Huaihe River Basin. In the past 21years, the influence of climatic factors on NDVI in the Yangtze River Basin, the Songliao River Basin, the Yellow River Basin and the Southwest River Basin has mostly increased, while the influence of climatic factors in other river basins has basically decreased.

Key words： nine major basins NDVI climatic factors spatial-temporal variations Geodetector

Received: 27 February 2023

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X171.1

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	SUN Rui
	ZHANG Fang-min
	WENG Sheng-heng
	LIU Qian

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SUN Rui,ZHANG Fang-min,WENG Sheng-heng等. Spatio-temporal changes of NDVI and its response to climate in China from 2001 to 2021[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(10): 5519-5528.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I10/5519

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