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Sökning: WFRF:(Coetsee E)

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  • Pellegrini, Adam F.A., et al. (författare)
  • Soil carbon storage capacity of drylands under altered fire regimes
  • 2023
  • Ingår i: Nature Climate Change. - 1758-678X. ; 13:10, s. 1089-1094
  • Tidskriftsartikel (refereegranskat)abstract
    • The determinants of fire-driven changes in soil organic carbon (SOC) across broad environmental gradients remains unclear, especially in global drylands. Here we combined datasets and field sampling of fire-manipulation experiments to evaluate where and why fire changes SOC and compared our statistical model to simulations from ecosystem models. Drier ecosystems experienced larger relative changes in SOC than humid ecosystems—in some cases exceeding losses from plant biomass pools—primarily explained by high fire-driven declines in tree biomass inputs in dry ecosystems. Many ecosystem models underestimated the SOC changes in drier ecosystems. Upscaling our statistical model predicted that soils in savannah–grassland regions may have gained 0.64 PgC due to net-declines in burned area over the past approximately two decades. Consequently, ongoing declines in fire frequencies have probably created an extensive carbon sink in the soils of global drylands that may have been underestimated by ecosystem models.
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  • Yagoub, M. Y. A., et al. (författare)
  • Enhanced Pr3+ photoluminescence by energy transfer in SrF2:Eu2+, Pr3+ phosphor
  • 2016
  • Ingår i: AIP Advances. - : AMER INST PHYSICS. - 2158-3226. ; 6:2, s. 025204-
  • Tidskriftsartikel (refereegranskat)abstract
    • Efficient energy transfer was demonstrated in the SrF2:Eu2+, Pr3+ phosphor synthesized by the co-precipitation method. Results obtained with X-ray diffraction (XRD), scanning electron microscopy (SEM), x-ray spectroscopy (XPS), photoluminescence (PL) and decay curves proposed the UV-Vis energy transfer process. The energy transfer process between the Eu2+ and Pr3+ ions in SrF2 was investigated to evaluate the potential of the Eu2+ ion as a sensitizer for the Pr3+ ion. The results proposed that Eu2+ could be a good sensitizer for absorbing the UV photons and efficiently enhancing the Pr3+ emission intensity. The energy transfer process was effective until concentration quenching for the Pr3+ ions occurred. The concentration quenching was attributed to cross-relaxation between the Pr3+ ions. (C) 2016 Author(s).
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