Dynamic Monitoring of Oxygen Supply Capacity of Urban Green Space Based on Satellite-Based Chlorophyll Fluorescence

Li Yao, Zifei Ping (), Yufang Sun, Wei Zhou, Hui Zheng (), Qiangqiang Ding and Xiang Liao
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Li Yao: School of Economics, Hangzhou Normal University, Hangzhou 311121, China
Zifei Ping: Lanzhou Institute of Seismology, China Seismological Bureau (CEA), Lanzhou 730000, China
Yufang Sun: Institute of Hydrogeology and Environment of Ningxia, Yinchuan 750026, China
Wei Zhou: School of Geographical Sciences, Southwest University, Chongqing 400715, China
Hui Zheng: Key Laboratory of Geospatial Technology for Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Kaifeng 475004, China
Qiangqiang Ding: Chongqing Pioneer Satellite Technology Co., Ltd., Chongqing 401420, China
Xiang Liao: Chongqing Pioneer Satellite Technology Co., Ltd., Chongqing 401420, China

Land, 2023, vol. 12, issue 2, 1-18

Abstract: Green plants provide food, energy and oxygen sources for human beings and animals on Earth through photosynthesis, which is essential to maintain regional ecological balance. However, few studies have focused on the natural oxygen supply capacity of urban green spaces. As a companion to photosynthesis in leaves, solar-induced chlorophyll fluorescence (SIF) contains abundant photosynthetic information. Currently, satellite-based SIF observations are considered to be a rapid and nondestructive ‘indicator’ of plant photosynthesis, which provides an alternative way to quantitatively assess the spatio-temporal dynamics of oxygen supply capacity in urban green spaces. This study examined the spatial patterns, long-term trends, and environmental control factors of SIF in the nine central cities in China from 2001 to 2020 based on the time-series of the global reconstructed GOSIF-v2 SIF dataset. The results were as follows: (1) There was a contrasting spatial difference between southern and northern cities in China, and multi-year mean SIF values of the southern cities were generally higher than those of the northern cities; (2) The interannual dynamics of SIF in each city generally showed an upward trend, with fluctuations, and the intraannual seasonal differences were more significant in northern cities than those in the southern cities; (3) The spatial trend analysis showed that Beijing, Guangzhou, and Chongqing have had the most significant improvements, followed by Xi’an, Wuhan, Chengdu, and Zhengzhou, while Tianjin and Shanghai have had the least improvements; and (4) The expansion of construction land has exerted significant impacts on the dynamics of the SIF trend in several cities, but it is not the only factor. All analyses indicated that the improvement of vegetation structure and function in the area can offset its negative effect.

Keywords: urban green space; SIF; dynamic change; oxygen supply; central cities (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2023
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