Photosynthesis and stomatal conductance responses of poplars to free-air CO2 enrichment (PopFACE) during the first growth cycle and immediately following coppice
• Using the Poplar Free Air CO2 Enrichement (PopFACE) facility we investigated the effects of elevated [CO2 ] on the diurnal and growth cycle responses of photosynthesis and conductance in three poplar species. • In situ diurnal measurements of photosynthesis were made on Populus alba, P. nigra...
| Veröffentlicht in: | The New phytologist. - 1979. - 159(2003), 3 vom: 20. Sept., Seite 609-621 |
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| 1. Verfasser: | |
| Weitere Verfasser: | , , , , , |
| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2003
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| Zugriff auf das übergeordnete Werk: | The New phytologist |
| Schlagworte: | Journal Article Free Air CO2 Enrichment (FACE) Populus spp Rubisco atmospheric change climate change elevated CO2 photosynthetic electron transport |
| Zusammenfassung: | • Using the Poplar Free Air CO2 Enrichement (PopFACE) facility we investigated the effects of elevated [CO2 ] on the diurnal and growth cycle responses of photosynthesis and conductance in three poplar species. • In situ diurnal measurements of photosynthesis were made on Populus alba, P. nigra and P. ×euramericana and, in parallel, in vivo maximum capacity for carboxylation (Vc,max ) and maximum rates of electron transport (Jmax ) were determined by gas exchange measurement. • Light saturated (Asat ) and daily integrated (A') photosynthesis increased at elevated [CO2 ] in all species. Elevated [CO2 ] decreased Vc,max and Jmax for P. nigra and Jmax for P.¥euramericana but had no effect on stomatal conductance in any of the species throughout the first growth cycle. During post-coppice re-growth, elevated [CO2 ] did not increase Asat in P. nigra and P.×euramericana due to large decreases in Vc,max and Jmax . • A 50% increase in [CO2 ] under these open-air field conditions resulted in a large and sustained increase in Asat . Although there were some differences between the species, these had little effect on photosynthetic rates at the growth [CO2 ]. Nevertheless the results show that even fast growing trees grown without rooting volume restriction in the open may still show some down-regulation of photosynthetic potential at elevated [CO2 ] |
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| Beschreibung: | Date Revised 20.04.2021 published: Print Citation Status PubMed-not-MEDLINE |
| ISSN: | 1469-8137 |
| DOI: | 10.1046/j.1469-8137.2003.00850.x |