2000~2020年成渝双城经济圈植被生态质量变化及其对极端气候因子的响应

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Abstract As the fourth pole of China's economic growth, the Chengdu-Chongqing economic circle has great responsibility to build a solid ecological barrier in the upper reaches of the Yangtze River, which is of great significance to the strategy of ecological environmental protection. In this study, based on the NPP and vegetation coverage FVC data from 2000 to 2020 in the Chengdu-Chongqing urban area, the vegetation ecological quality index (EQI) was constructed, and the spatiotemporal variation characteristics of vegetation ecological quality and the response of extreme climatic factors were analyzed. The results showed that: (1) from 2000 to 2020, the EQI in Chengdu-Chongqing area was generally stable and alternately up-down, and the average value of vegetation ecological environment quality for many years was 63.96; (2) the EQI in Chengdu-Chongqing urban area showed a spatial distribution pattern of low in the middle and high in the surrounding areas. The areas with large values of the average ecological environment quality index were mainly concentrated in the mountainous areas around the Chengdu-Chongqing economic circle, and the southeast area of Chongqing also has a high average EQI. The distribution of the average ecological environment quality index in the central region was similar between years with a little change; (3) from 2000 to 2020, the slope of ecological environment quality in Chengdu-Chongqing economic circle showed a good development trend. The areas with the minimum slope grades (-3.17~-0.42) were mainly distributed in Chengdu and the surrounding areas of Chongqing main city. The slopes of the ecological environment quality trend in the eastern and central parts of the Chengdu-Chongqing urban area showed a growing trend; (4) in the Chengdu-Chongqing economic circle, there are the significantly positive correlations at 0.01level between the EQI and the number of days with daily maximum temperature>25℃ (SU) in the extreme climate index, at 0.05level between the EQI and the number of days with daily maximum temperature higher than 90% of the quantile (TX90P), and at 0.05level between the EQI and the number of days with daily minimum temperature<0℃ (FD). Whereas, the EQI is of negative correlation at 0.05level to the number of days with daily minimum temperature higher than 90% of the quantile (TN90P). The results can provide a basis for understanding the changes of vegetation habitat quality and its response to extreme climate in the Chengdu-Chongqing economic circle.

Key words： ecological quality index extreme climates spatial variation correlation Chengdu-Chongqing economic circle

Received: 01 February 2023

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	ZHANG Yan-jun
	LI Zi-hui
	GUAN Dong-jie
	LI Zhen-liang

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ZHANG Yan-jun,LI Zi-hui,GUAN Dong-jie等. Changes of vegetation ecological quality in the Chengdu-Chongqing economic circle from 2000 to 2020 and its response to extreme climatic factor[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(9): 4876-4885.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I9/4876

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