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Contrasting Depende...
Contrasting Dependencies of Photosynthetic Capacity on Leaf Nitrogen in Early- and Late-Successional Tropical Montane Tree Species
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- Ziegler, Camille (author)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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- Dusenge, Mirindi Eric, 1986 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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- Nyirambangutse, Brigitte, 1982 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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Zibera, E. (author)
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- Wallin, Göran, 1955 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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- Uddling, Johan, 1972 (author)
- Gothenburg University,Göteborgs universitet,Institutionen för biologi och miljövetenskap,Department of Biological and Environmental Sciences
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(creator_code:org_t)
- 2020-09-17
- 2020
- English.
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In: Frontiers in Plant Science. - : Frontiers Media SA. - 1664-462X. ; 11
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Abstract
Subject headings
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- Differences in photosynthetic capacity among tree species and tree functional types are currently assumed to be largely driven by variation in leaf nutrient content, particularly nitrogen (N). However, recent studies indicate that leaf N content is often a poor predictor of variation in photosynthetic capacity in tropical trees. In this study, we explored the relative importance of area-based total leaf N content (N-tot) and within-leaf N allocation to photosynthetic capacity versus light-harvesting in controlling the variation in photosynthetic capacity (i.e.V-cmax,J(max)) among mature trees of 12 species belonging to either early (ES) or late successional (LS) groups growing in a tropical montane rainforest in Rwanda, Central Africa. Photosynthetic capacity at a common leaf temperature of 25x2da;C (i.e. maximum rates of Rubisco carboxylation,V(cmax25)and of electron transport,J(max25)) was higher in ES than in LS species (+ 58% and 68% forV(cmax25)andJ(max25), respectively). While N(tot)did not significantly differ between successional groups, the photosynthetic dependency on N(tot)was markedly different. In ES species,V(cmax25)was strongly and positively related to N(tot)but this was not the case in LS species. However, there was no significant trade-off between relative leaf N investments in compounds maximizing photosynthetic capacity versus compounds maximizing light harvesting. Both leaf dark respiration at 25x2da;C (+ 33%) and, more surprisingly, apparent photosynthetic quantum yield (+ 35%) was higher in ES than in LS species. Moreover, R(d25)was positively related to N(tot)for both ES and LS species. Our results imply that efforts to quantify carbon fluxes of tropical montane rainforests would be improved if they considered contrasting within-leaf N allocation and photosynthetic N(tot)dependencies between species with different successional strategies.
Subject headings
- NATURVETENSKAP -- Biologi -- Botanik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Botany (hsv//eng)
Keyword
- photosynthesis
- nitrogen
- allocation
- early successional
- late
- successional
- tropical montane forests
- temperature response
- dark respiration
- kakamega-forest
- elevated co2
- traits
- light
- acclimation
- parameters
- phosphorus
- canopy
- Plant Sciences
Publication and Content Type
- ref (subject category)
- art (subject category)
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