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Sökning: WFRF:(Veenendaal I.)

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  • Rosenberg, M. J. F., et al. (författare)
  • The Herschel Comprehensive (U)lirg Emission Survey (Hercules): Co Ladders, Fine Structure Lines, and Neutral Gas Cooling
  • 2015
  • Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 801:2
  • Tidskriftsartikel (refereegranskat)abstract
    • (Ultra) luminous infrared galaxies ((U)LIRGs) are objects characterized by their extreme infrared (8-1000 mu m) luminosities (L-LIRG > 10(11) L-circle dot and L-ULIRG > 10(12) L-circle dot). The Herschel Comprehensive ULIRG Emission Survey (PI: van derWerf) presents a representative flux-limited sample of 29 (U)LIRGs that spans the full luminosity range of these objects (10(11)L(circle dot)
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3.
  • Mantlana, K. B., et al. (författare)
  • Biomass and leaf-level gas exchange characteristics of three African savanna C-4 grass species under optimum growth conditions
  • 2009
  • Ingår i: African Journal of Ecology. - : Wiley. - 1365-2028 .- 0141-6707. ; 47:4, s. 482-489
  • Tidskriftsartikel (refereegranskat)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.
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