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Biomass and leaf-level gas exchange characteristics of three African savanna C-4 grass species under optimum growth conditions

Mantlana, K. B.; Veenendaal, E. M.; Arneth, Almut LU ; Grispen, V.; Bonyongo, C. M.; Heitkonig, I. G. and Lloyd, J. (2009) In African Journal of Ecology 47(4). p.482-489
Abstract
C-4 savanna grass species, Digitaria eriantha, Eragrostis lehmanniana and Panicum repens, were grown under optimum growth conditions with the aim of characterizing their above- and below-ground biomass allocation and the response of their gas exchange to changes in light intensity, CO2 concentration and leaf-to-air vapour pressure deficit gradient (D-l). Digitaria eriantha showed the largest above- and below-ground biomass, high efficiency in carbon gain under light-limiting conditions, high water use efficiency (WUE) and strong stomatal sensitivity to D-l (P = 0.002; r2 = 0.5). Panicum repens had a high aboveground biomass and attained high light saturated photosynthetic rates (A(sat), 47 mu mol m-2 s-1), stomatal conductance, (g(sat),... (More)
C-4 savanna grass species, Digitaria eriantha, Eragrostis lehmanniana and Panicum repens, were grown under optimum growth conditions with the aim of characterizing their above- and below-ground biomass allocation and the response of their gas exchange to changes in light intensity, CO2 concentration and leaf-to-air vapour pressure deficit gradient (D-l). Digitaria eriantha showed the largest above- and below-ground biomass, high efficiency in carbon gain under light-limiting conditions, high water use efficiency (WUE) and strong stomatal sensitivity to D-l (P = 0.002; r2 = 0.5). Panicum repens had a high aboveground biomass and attained high light saturated photosynthetic rates (A(sat), 47 mu mol m-2 s-1), stomatal conductance, (g(sat), 0.25 mol m-2 s-1) at relatively high WUE. Eragrostis lehmanniana had almost half the biomass of other species, and had similar A(sat) and g(sat) but were attained at lower WUE than the other species. This species also showed the weakest stomatal response to D-l (P = 0.19, r2 = 0. 1). The potential ecological significance of the contrasting patterns of biomass allocation and variations in gas exchange parameters among the species are discussed.Resume On a fait pousser des especes herbeuses de savane de type C4, Digitaria eriantha, Eragrostis lehmanniana et Panicum repens, dans des conditions optimales dans le but de caracteriser l'allocation de leur biomasse aerienne et racinaire et la reponse de leur echange gazeux des changements d'intensite de la lumiere, de concentrations de CO2, et un gradient deficitaire (D-l) de pression de vapeur feuille-air. D. eriantha montrait la plus grande biomasse aerienne et racinaire, une grande efficience de l'assimilation de carbone dans des conditions de luminosite limitee, une grande efficience d'utilisation de l'eau (WUE) et une forte sensibilite des stomates D-l (P = 0,002; r2 = 0,5). P. repens avait une grande biomasse aerienne et atteignait des taux photosynthetiques eleves en lumiere saturee (A(sat), 47 mu mol m-2 s-1), et une conductance stomatique (g(sat) 0.25 mol m-2 s-1) une WUE relativement elevee. E. lehmanniana avait une biomasse qui etait presque la moitie de celle des autres especes et avait un A(sat) et un g(sat) similaires mais qui etaient atteints une WUE plus basse que les autres especes. Cette espece montrait aussi la plus faible reponse stomatique D-l (P = 0,19, r2 = 0,1). L'on discute de la signification ecologique potentielle de ces schemas contrastes d'allocations de biomasse et des variations des parametres des echanges gazeux entre les especes. (Less)
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subject
keywords
vapour pressure deficit, leaf-to-air, gas exchange characteristics, Eragrostis lehmanniana, Digitaria eriantha, above- and below-ground biomass, C-4 grasses, Panicum repens, Okavango Delta
in
African Journal of Ecology
volume
47
issue
4
pages
482 - 489
publisher
Wiley-Blackwell
external identifiers
  • wos:000271758600005
  • scopus:73149093200
ISSN
1365-2028
DOI
10.1111/j.1365-2028.2008.00961.x
language
English
LU publication?
yes
id
2f22d717-3914-4f9d-ba4c-1f853d3b3602 (old id 1519685)
date added to LUP
2009-12-28 11:27:36
date last changed
2017-01-01 04:49:10
@article{2f22d717-3914-4f9d-ba4c-1f853d3b3602,
  abstract     = {C-4 savanna grass species, Digitaria eriantha, Eragrostis lehmanniana and Panicum repens, were grown under optimum growth conditions with the aim of characterizing their above- and below-ground biomass allocation and the response of their gas exchange to changes in light intensity, CO2 concentration and leaf-to-air vapour pressure deficit gradient (D-l). Digitaria eriantha showed the largest above- and below-ground biomass, high efficiency in carbon gain under light-limiting conditions, high water use efficiency (WUE) and strong stomatal sensitivity to D-l (P = 0.002; r2 = 0.5). Panicum repens had a high aboveground biomass and attained high light saturated photosynthetic rates (A(sat), 47 mu mol m-2 s-1), stomatal conductance, (g(sat), 0.25 mol m-2 s-1) at relatively high WUE. Eragrostis lehmanniana had almost half the biomass of other species, and had similar A(sat) and g(sat) but were attained at lower WUE than the other species. This species also showed the weakest stomatal response to D-l (P = 0.19, r2 = 0. 1). The potential ecological significance of the contrasting patterns of biomass allocation and variations in gas exchange parameters among the species are discussed.Resume On a fait pousser des especes herbeuses de savane de type C4, Digitaria eriantha, Eragrostis lehmanniana et Panicum repens, dans des conditions optimales dans le but de caracteriser l'allocation de leur biomasse aerienne et racinaire et la reponse de leur echange gazeux des changements d'intensite de la lumiere, de concentrations de CO2, et un gradient deficitaire (D-l) de pression de vapeur feuille-air. D. eriantha montrait la plus grande biomasse aerienne et racinaire, une grande efficience de l'assimilation de carbone dans des conditions de luminosite limitee, une grande efficience d'utilisation de l'eau (WUE) et une forte sensibilite des stomates D-l (P = 0,002; r2 = 0,5). P. repens avait une grande biomasse aerienne et atteignait des taux photosynthetiques eleves en lumiere saturee (A(sat), 47 mu mol m-2 s-1), et une conductance stomatique (g(sat) 0.25 mol m-2 s-1) une WUE relativement elevee. E. lehmanniana avait une biomasse qui etait presque la moitie de celle des autres especes et avait un A(sat) et un g(sat) similaires mais qui etaient atteints une WUE plus basse que les autres especes. Cette espece montrait aussi la plus faible reponse stomatique D-l (P = 0,19, r2 = 0,1). L'on discute de la signification ecologique potentielle de ces schemas contrastes d'allocations de biomasse et des variations des parametres des echanges gazeux entre les especes.},
  author       = {Mantlana, K. B. and Veenendaal, E. M. and Arneth, Almut and Grispen, V. and Bonyongo, C. M. and Heitkonig, I. G. and Lloyd, J.},
  issn         = {1365-2028},
  keyword      = {vapour pressure deficit,leaf-to-air,gas exchange characteristics,Eragrostis lehmanniana,Digitaria eriantha,above- and below-ground biomass,C-4 grasses,Panicum repens,Okavango Delta},
  language     = {eng},
  number       = {4},
  pages        = {482--489},
  publisher    = {Wiley-Blackwell},
  series       = {African Journal of Ecology},
  title        = {Biomass and leaf-level gas exchange characteristics of three African savanna C-4 grass species under optimum growth conditions},
  url          = {http://dx.doi.org/10.1111/j.1365-2028.2008.00961.x},
  volume       = {47},
  year         = {2009},
}