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|a eng
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| 100 |
1 |
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|a Cernusak, Lucas A
|e verfasserin
|4 aut
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|a Transpiration efficiency of a tropical pioneer tree (Ficus insipida) in relation to soil fertility
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|c 2007
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
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|2 rdacarrier
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|a Date Completed 24.03.2008
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|a Date Revised 16.11.2017
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|a published: Print
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|a Citation Status MEDLINE
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|a The response of whole-plant water-use efficiency, termed transpiration efficiency (TE), to variation in soil fertility was assessed in a tropical pioneer tree, Ficus insipida Willd. Measurements of stable isotope ratios (delta(13)C, delta(18)O, delta(15)N), elemental concentrations (C, N, P), plant growth, instantaneous leaf gas exchange, and whole-plant water use were used to analyse the mechanisms controlling TE. Plants were grown individually in 19 l pots with non-limiting soil moisture. Soil fertility was altered by mixing soil with varying proportions of rice husks, and applying a slow release fertilizer. A large variation was observed in leaf photosynthetic rate, mean relative growth rate (RGR), and TE in response to experimental treatments; these traits were well correlated with variation in leaf N concentration. Variation in TE showed a strong dependence on the ratio of intercellular to ambient CO(2) mole fractions (c(i)/c(a)); both for instantaneous measurements of c(i)/c(a) (R(2)=0.69, P <0.0001, n=30), and integrated estimates based on C isotope discrimination (R(2)=0.88, P <0.0001, n=30). On the other hand, variations in the leaf-to-air humidity gradient, unproductive water loss, and respiratory C use probably played only minor roles in modulating TE in the face of variable soil fertility. The pronounced variation in TE resulted from a combination of the strong response of c(i)/c(a) to leaf N, and inherently high values of c(i)/c(a) for this tropical tree species; these two factors conspired to cause a 4-fold variation among treatments in (1-c(i)/c(a)), the term that actually modifies TE. Results suggest that variation in plant N status could have important implications for the coupling between C and water exchange in tropical forest trees
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Nitrogen
|2 NLM
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| 650 |
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|2 NLM
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|a Oxygen
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|a S88TT14065
|2 NLM
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|a Winter, Klaus
|e verfasserin
|4 aut
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|a Aranda, Jorge
|e verfasserin
|4 aut
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|a Turner, Benjamin L
|e verfasserin
|4 aut
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| 700 |
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|a Marshall, John D
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Journal of experimental botany
|d 1985
|g 58(2007), 13 vom: 15., Seite 3549-66
|w (DE-627)NLM098182706
|x 1460-2431
|7 nnns
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|g volume:58
|g year:2007
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|g day:15
|g pages:3549-66
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