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  Photosynthetic properties of C4 plants growing in an African savanna/wetland mosaic

Mantlana, K. B., Arneth, A., Veenendaal, E. M., Wohland, P., Wolski, P., Kolle, O., et al. (2008). Photosynthetic properties of C4 plants growing in an African savanna/wetland mosaic. Journal of Experimental Botany, 59(14), 3941-3952. doi:10.1093/jxb/ern237.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-000E-D704-B Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-770B-3
Genre: Journal Article

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BGC1167.pdf (Publisher version), 269KB
 
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http://dx.doi.org/10.1093/jxb/ern237 (Publisher version)
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 Creators:
Mantlana, K. Brian1, Author              
Arneth, A., Author
Veenendaal, E. M., Author
Wohland, P., Author
Wolski, P., Author
Kolle, O.2, Author              
Wagner, M., Author
Lloyd, J., Author
Affiliations:
1Department Biogeochemical Processes, Prof. E.-D. Schulze, Max Planck Institute for Biogeochemistry, Max Planck Society, escidoc:1497751              
2Service Facility Field Measurements & Instrumentation, O. Kolle, Max Planck Institute for Biogeochemistry, Max Planck Society, escidoc:1497769              

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Free keywords: C-4 species Leaf nitrogen Leaf phosphorus Net photosynthesis Nitrogen use efficiency Specific leaf area Stomatal conductance Nitrogen-use efficiency Atmospheric CO2 Echinochloa-polystachya Stomatal conductance Cerrado vegetation Amazon floodplain Gas-exchange C4 plants Leaf Grasses
 Abstract: Photosynthesis rates and photosynthesis-leaf nutrient relationships were analysed in nine tropical grass and sedge species growing in three different ecosystems: a rain-fed grassland, a seasonal floodplain, and a permanent swamp, located along a hydrological gradient in the Okavango Delta, Botswana. These investigations were conducted during the rainy season, at a time of the year when differences in growth conditions between the sites were relatively uniform. At the permanent swamp, the largest variations were found for area-based leaf nitrogen contents, from 20 mmol m(-2) to 140 mmol m(-2), nitrogen use efficiencies (NUE), from 0.2 mmol (C) mol(-1) (N) s(-1) to 2.0 mmol (C) mol(-1) (N) s(-1), and specific leaf areas (SLA), from 50 cm(2) g(-1) to 400 cm(2) g(-1). For the vegetation growing at the rainfed grassland, the highest leaf gas exchange rates, high leaf nutrient levels, a low ratio of intercellular to ambient CO2 concentration, and high carboxylation efficiency were found. Taken together, these observations indicate a very efficient growth strategy that is required for survival and reproduction during the relatively brief period of water availability. The overall lowest values of light-saturated photosynthesis (A(sat)) were observed at the seasonal floodplain; around 25 mu mol m(-2) s(-1) and 30 mu mol m(-2) s(-1). To place these observations into the broader context of functional leaf trait analysis, relationships of photosynthesis rates, specific leaf area, and foliar nutrient levels were plotted, in the same way as was done for previously published 'scaling relationships' that are based largely on C-3 plants, noting the differences in the analyses between this study and the previous study. The within-and across-species variation in both A(sat) and SLA appeared better predicted by foliar phosphorus content (dry mass or area basis) rather than by foliar nitrogen concentrations, possibly because the availability of phosphorus is even more critical than the availability of nitrogen in the studied relatively oligotrophic ecosystems. [References: 49]

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 Dates: 2008-08-202008
 Publication Status: Published in print
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 Identifiers: DOI: 10.1093/jxb/ern237
Other: BGC1167
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Title: Journal of Experimental Botany
Source Genre: Journal
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Publ. Info: Oxford : Oxford University Press [etc.]
Pages: - Volume / Issue: 59 (14) Sequence Number: - Start / End Page: 3941 - 3952 Identifier: CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/954925413883
ISSN: 0022-0957