Seasonal peak photosynthesis is hindered by late canopy development in northern ecosystems
Zhao, Qian (Peking University. Institute of Carbon Neutrality)
Zhu, Zaichun (Peking University. School of Urban Planning and Design)
Zeng, Hui (Peking University. School of Urban Planning and Design)
Myneni, Ranga B. (Boston University. Department of Earth and Environment)
Zhang, Yao (Peking University. Institute of Carbon Neutrality)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Piao, Shilong (Institute of Tibetan Plateau Research)

Data:	2022
Resum:	The seasonal dynamics of the vegetation canopy strongly regulate the surface energy balance and terrestrial carbon fuxes, providing feedbacks to climate change. Whether the seasonal timing of maximum canopy structure was optimized to achieve a maximum photosynthetic carbon uptake is still not clear due to the complex interactions between abiotic and biotic factors. We used two solar-induced chlorophyll fuorescence datasets as proxies for photosynthesis and the normalized diference vegetation index and leaf area index products derived from the moderate resolution imaging spectroradiometer as proxies for canopy structure, to characterize the connection between their seasonal peak timings from 2000 to 2018. We found that the seasonal peak was earlier for photosynthesis than for canopy structure in >87. 5% of the northern vegetated area, probably leading to a suboptimal maximum seasonal photosynthesis. This mismatch in peak timing signifcantly increased during the study period, mainly due to the increasing atmospheric CO2, and its spatial variation was mainly explained by climatic variables (43. 7%) and nutrient limitations (29. 6%). State-of-the-art ecosystem models overestimated this mismatch in peak timing by simulating a delayed seasonal peak of canopy development. These results highlight the importance of incorporating the mechanisms of vegetation canopy dynamics to accurately predict the maximum potential terrestrial uptake of carbon under global environmental change.
Ajuts:	Agencia Estatal de Investigación PID2019-110521GB-I00 Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1005 Agència de Gestió d'Ajuts Universitaris i de Recerca 2020/PANDE00117
Nota:	Altres ajuts: Fundación Ramón Areces grant CIVP20A6621.
Drets:	Tots els drets reservats.
Llengua:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Publicat a:	Nature Plants, Vol. 8, Issue 12 (Dec. 2022) , p. 1484-1492

DOI: 10.1038/s41477-022-01278-9

Postprint 42 p, 1.4 MB

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