Abstract
To investigate the effects of elevated atmospheric CO2 concentrations ([CO2]) on autumnal phenology and end of season photosynthesis of different bud-break leaves of trees, we fumigated 2-year-old red maple seedlings with 800, 600, and 400 μL L−1 [CO2] in nine continuous stirred tank reactor (CSTR) chambers. Leaves were subdivided into first (B1), second (B2), and third bud-break (B3) leaves. The results indicated that (1) autumnal leaf senescence, including the beginning date, end date, and duration of leaf abscission of all three bud-break leaf groups, was not affected by elevated [CO2]; (2) elevated [CO2] increased leaf photosynthesis of B1, B2, and B3 leaves throughout the whole of the growing season; (3) elevated [CO2] significantly increased whole plant photosynthesis only for B2 leaves, accounting for 41.2–54.7% of the whole plant photosynthesis, due to the larger whole leaf area of B2. In conclusion, enhanced seasonal carbon gain in response to atmospheric CO2 enrichment is the result of strong stimulation of photosynthesis throughout the growing season, especially for B2 leaves but not by extending or shortening the growing season in autumn.
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Abbreviations
- P Nsat :
-
leaf light-saturated net photosynthetic rate
- P Nsatw :
-
whole plant light-saturated photosynthetic rate
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Acknowledgments
We appreciate Professor Michelle DaCosta in UMass, Amherst, for loaning us the LI-Cor 6400 photosynthesis system and giving us many kind suggestions during the experiment, Professors David Ratkowsky (Tasmanian Institute of Agriculture) and Bo Larson (University of Copenhagen) helped greatly with English polishing and suggestions for revision. We thank anonymous reviewers for their time and efforts in improving this paper.
Funding
This work was funded by the National Natural Science for Youth Foundation of China (31700439) and China Postdoctoral Foundation (2018M631595).
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Conceptualization, William Manning; methodology, William Manning and Li Li; formal analysis, Li Li; investigation, Li Li; data curation, Li Li; writing–original draft preparation, Li Li; writing–review and editing, Wang Xiaoke; project administration, William Manning; funding acquisition, William Manning and Li Li.
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Li, L., Manning, W. & Wang, X. Effects of Elevated CO2 Concentrations on Leaf Senescence and Late-Season Net Photosynthesis of Red Maple (Acer rubrum). Water Air Soil Pollut 231, 467 (2020). https://doi.org/10.1007/s11270-020-04828-z
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DOI: https://doi.org/10.1007/s11270-020-04828-z