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9. Vegetation clumping modulates global photosynthesis through adjusting canopy light environment

Author

Li, Fa, Hao, Dalei, Zhu, Qing, Yuan, Kunxiaojia, Braghiere, Renato K, He, Liming, Luo, Xiangzhong, Wei, Shanshan, Riley, William J, Zeng, Yelu, and Chen, Min

Subjects
Biological Sciences, Ecosystem, Photosynthesis, Climate, Seasons, Plant Leaves, Light, canopy structure, clumping index, gross primary production, radiative transfer, terrestrial biosphere modeling, Environmental Sciences, Ecology, Biological sciences, Earth sciences, Environmental sciences
Abstract

The spatial dispersion of photoelements within a vegetation canopy, quantified by the clumping index (CI), directly regulates the within-canopy light environment and photosynthesis rate, but is not commonly implemented in terrestrial biosphere models to estimate the ecosystem carbon cycle. A few global CI products have been developed recently with remote sensing measurements, making it possible to examine the global impacts of CI. This study deployed CI in the radiative transfer scheme of the Community Land Model version 5 (CLM5) and used the revised CLM5 to quantitatively evaluate the extent to which CI can affect canopy absorbed radiation and gross primary production (GPP), and for the first time, considering the uncertainty and seasonal variation of CI with multiple remote sensing products. Compared to the results without considering the CI impact, the revised CLM5 estimated that sunlit canopy absorbed up to 9%-15% and 23%-34% less direct and diffuse radiation, respectively, while shaded canopy absorbed 3%-18% more diffuse radiation across different biome types. The CI impacts on canopy light conditions included changes in canopy light absorption, and sunlit-shaded leaf area fraction related to nitrogen distribution and thus the maximum rate of Rubisco carboxylase activity (Vcmax ), which together decreased photosynthesis in sunlit canopy by 5.9-7.2 PgC year-1 while enhanced photosynthesis by 6.9-8.2 PgC year-1 in shaded canopy. With higher light use efficiency of shaded leaves, shaded canopy increased photosynthesis compensated and exceeded the lost photosynthesis in sunlit canopy, resulting in 1.0 ± 0.12 PgC year-1 net increase in GPP. The uncertainty of GPP due to the different input CI datasets was much larger than that caused by CI seasonal variations, and was up to 50% of the magnitude of GPP interannual variations in the tropical regions. This study highlights the necessity of considering the impacts of CI and its uncertainty in terrestrial biosphere models.

Published
2023

23. Ambient fine particulate matter and allergic symptoms in the middle-aged and elderly population: results from the PIFCOPD study

Author

Wei, Shanshan, Liao, Jiping, Xue, Tao, Yu, Kunyao, Fu, Xiuhua, Wang, Ruiying, Dang, Xiaomin, Zhang, Cheng, Qiao, Hua, Jiang, Shujuan, Xiao, Jianhong, Dong, Lixia, Yin, Jinzhi, Yan, Xixin, Jia, Weihua, Zhang, Guifang, Chen, Rui, Zhou, Bo, Song, Beibei, Li, Jing, Yin, Mengyu, Zhang, Lina, Xie, Liping, Dong, Shaochen, Sun, Jian, Gao, Peng, Miao, Bifang, Li, Wei, He, Lan, Ning, Qian, Zhao, Limin, Liu, Hengyi, Cao, Han, and Wang, Guangfa

Published
2023
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28. Correlation Analysis and Forecast of Electric Vehicle Charging Stations Considering Seasonal Factors

Author

Yu, Qianxu, Ren, Jing, Wei, Shanshan, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Sun, Jiande, editor, Wang, Yue, editor, Huo, Mengyao, editor, and Xu, Lexi, editor

Published
2023
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