Increasing temperature regulates the advance of peak photosynthesis timing in the boreal ecosystem

Guo Li; Chaoyang Wu; Yanan Chen; Changping Huang; Yan Zhao; Yanan Wang; Mingguo Ma; Zhi Ding; Pujia Yu; Xuguang Tang

doi:10.1016/j.scitotenv.2023.163587

Increasing temperature regulates the advance of peak photosynthesis timing in the boreal ecosystem

Sci Total Environ. 2023 Jul 15:882:163587. doi: 10.1016/j.scitotenv.2023.163587. Epub 2023 Apr 20.

Authors

Guo Li¹, Chaoyang Wu², Yanan Chen¹, Changping Huang³, Yan Zhao¹, Yanan Wang¹, Mingguo Ma¹, Zhi Ding¹, Pujia Yu¹, Xuguang Tang⁴

Affiliations

¹ Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China; Chongqing Engineering Research Center for Remote Sensing Big Data Application, School of Geographical Sciences, Southwest University, Chongqing 400715, China.
² Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China.
³ National Engineering Laboratory for Satellite Remote Sensing Applications, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100094, China.
⁴ Chongqing Jinfo Mountain Karst Ecosystem National Observation and Research Station, School of Geographical Sciences, Southwest University, Chongqing 400715, China; Chongqing Engineering Research Center for Remote Sensing Big Data Application, School of Geographical Sciences, Southwest University, Chongqing 400715, China. Electronic address: tangxuguang@cigit.ac.cn.

PMID: 37087004
DOI: 10.1016/j.scitotenv.2023.163587

Abstract

The shift in vegetation phenology is an essential indicator of global climate change. Numerous researches based on reflectance-based vegetation index data have explored the changes in the start (SOS) and end (EOS) of vegetation life events at long time scales, while a huge discrepancy existed between the phenological metrics of vegetation structure and function. The peak photosynthesis timing (PPT), which is crucial in regulating terrestrial ecosystem carbon balance, has not received much attention. Using two global reconstructed solar-induced chlorophyll fluorescence data (CSIF and GOSIF) directly associated with vegetation photosynthesis, the spatio-temporal dynamics in PPT as well as the key environmental controls across the boreal ecosystem during 2001-2019 were systematically explored. Multi-year mean pattern showed that PPT mainly appeared in the first half of July. Compared to the northern Eurasia, later PPT appeared in the northern North America continent for about 4-5 days. Meanwhile, spatial trend in PPT exhibited an advanced trend during the last two decades. Especially, shrubland and grassland were obvious among all biomes. Spatial partial correlation analysis revealed that preseason temperature was the dominant environmental driver of PPT trends, occupying 81.32% and 78.04% of the total pixels of PPT_CSIF and PPT_GOSIF, respectively. Attribution analysis by ridge regression again emphasized the largest contribution of temperature to PPT dynamics in the boreal ecosystem by 52.22% (PPT_CSIF) and 46.59% (PPT_GOSIF), followed by radiation (PPT_CSIF: 24.44%; PPT_GOSIF: 28.66%) and precipitation (PPT_CSIF: 23.34%; PPT_GOSIF: 24.75%). These results have significant implications for deepening our understanding between vegetation photosynthetic phenology and carbon cycling with respect to future climate change in the boreal ecosystem.

Keywords: CSIF; Climate change; GOSIF; Peak photosynthesis timing (PPT); Plant phenology; Remote sensing.

MeSH terms

Climate Change
Ecosystem*
Photosynthesis*
Seasons
Temperature