Spatio-temporal patterns and correlation analysis of AQI and NDVI in the middle and lower reaches of the Yellow River and Haihe River Basin
Zhang Chengli
Ma Jiayu
Lian Gaomin
Zhao Heying
Liu Mengjie
Yan Shuaiteng
Ma Qingxia
Su Yanxia
Abstract：Objectives To study the interaction between air pollutants and vegetation growth,Methods Krig-ing interpolation,Univariate linear regression and correlation analysis were employed to explain and ana-lyze the correlation of AQI and NDVI in Five provinces and two Cities located in the middle and lower reaches of the Yellow River(Henan Province,Shandong Province,Shanxi Province and Shaanxi Prov-ince)and Haihe River Basin(Hebei Province,Beijing City and Tianjin City)based on the normalized vegetation index(NDVI)provided by NASA and the online air quality index(AQI)provided by air quality monitoring and analysis platform.Results The results showed that:(1)From 2014 to 2016,the annual av-erage AQI,showed a significant downward trend,with highest value in winter,relatively low in spring and autumn,the lowest in summer.It aso showed obvious regional differences,with a"center-periphery"structure(higher in central areas and lower in surrounding regions).However,from 2017,the AQI value in summer is higher than that in spring and autumn.(2)From 2014 to 2020,NDVI values showed an up-ward trend,with a slope of 0.004 1/a.Overall,the area where NDVI values increased accounted for 93.76%of the total study region,and the areas with and the extremely significant and significant upward trends were 16.32%and 12.09%,respectively.Conclusions The spatio-temporal patterns and correlation analysis results of AQI and NDVI in the middle and lower reaches of the Yellow River and the Haihe River Basin can provide a theoretical basis for the study of the impact of climate change on the environment.
Keywords：Yellow River BasinHaihe River BasinAQINDVItemporal and spatial changes
Publication Date：2025-07-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 142-150,169 )