Biomass and leaf-level gas exchange characteristics of three African savanna C4 grass species under optimum growth conditions

K.B. Mantlana, E.M. Veenendaal, A. Arneth, V. Grispen, C.M. Bonyongo, I.M.A. Heitkönig, J. Lloyd

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

C4 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 (Dl). 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 Dl (P = 0.002; r2 = 0.5). Panicum repens had a high aboveground biomass and attained high light saturated photosynthetic rates (Asat, 47 ¿mol m¿2 s¿1), stomatal conductance, (gsat, 0.25 mol m¿2 s¿1) at relatively high WUE. Eragrostis lehmanniana had almost half the biomass of other species, and had similar Asat and gsat but were attained at lower WUE than the other species. This species also showed the weakest stomatal response to Dl (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
Original languageEnglish
Pages (from-to)482-489
JournalAfrican Journal of Ecology
Volume47
Issue number4
DOIs
Publication statusPublished - 2009

Keywords

  • water-use efficiency
  • elevated co2
  • photosynthesis
  • responses
  • humidity
  • botswana
  • drought
  • stomata
  • plants
  • yield

Fingerprint Dive into the research topics of 'Biomass and leaf-level gas exchange characteristics of three African savanna C4 grass species under optimum growth conditions'. Together they form a unique fingerprint.

Cite this