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

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...

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Vydáno v:	African journal of ecology Ročník 47; číslo 4; s. 482 - 489
Hlavní autoři:	Mantlana, K.B, Veenendaal, E.M, Arneth, A, Grispen, V, Bonyongo, C.M, Heitkonig, I.G, Lloyd, J
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	Oxford, UK Oxford, UK : Blackwell Publishing Ltd 01.12.2009 Blackwell Publishing Ltd
Témata:	above- and below-ground biomass aboveground biomass belowground biomass Biomass Biomass energy botswana C4 grasses C4 plants carbon Carbon dioxide Conductance C₄ grasses Digitaria eriantha drought dry matter partitioning elevated co2 Eragrostis lehmanniana Gas exchange gas exchange characteristics Gases Grasses Grasslands Growth conditions humidity leaf-to-air vapour pressure deficit Light intensity Okavango Delta Panicum repens photosynthesis Plant growth plants responses Savannahs savannas stomata Stomatal conductance stomatal movement Vapor pressure Water use Water use efficiency yield Africa
ISSN:	0141-6707, 1365-2028
On-line přístup:	Získat plný text
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Shrnutí:	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 μmol 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.
Bibliografie:	http://dx.doi.org/10.1111/j.1365-2028.2008.00961.x istex:B41BC2367AC57DBF1EE5F49FE102FBC95CD90FC9 ark:/67375/WNG-QTSFQ77Z-7 ArticleID:AJE961 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 14 ObjectType-Article-1 ObjectType-Feature-2 content type line 23
ISSN:	0141-6707 1365-2028
DOI:	10.1111/j.1365-2028.2008.00961.x