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Sökning: WFRF:(Michalopoulos A)

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  • Laruelle, G. G., et al. (författare)
  • Anthropogenic perturbations of the silicon cycle at the global scale: Key role of the land-ocean transition
  • 2009
  • Ingår i: Global Biogeochemical Cycles. - 0886-6236 .- 1944-9224. ; 23
  • Forskningsöversikt (refereegranskat)abstract
    • Silicon (Si), in the form of dissolved silicate (DSi), is a key nutrient in marine and continental ecosystems. DSi is taken up by organisms to produce structural elements (e.g., shells and phytoliths) composed of amorphous biogenic silica (bSiO(2)). A global mass balance model of the biologically active part of the modern Si cycle is derived on the basis of a systematic review of existing data regarding terrestrial and oceanic production fluxes, reservoir sizes, and residence times for DSi and bSiO(2). The model demonstrates the high sensitivity of biogeochemical Si cycling in the coastal zone to anthropogenic pressures, such as river damming and global temperature rise. As a result, further significant changes in the production and recycling of bSiO(2) in the coastal zone are to be expected over the course of this century.
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  • Sutton, Jill N., et al. (författare)
  • A review of the stable isotope bio-geochemistry of the global silicon cycle and its associated trace elements
  • 2018
  • Ingår i: Frontiers in Earth Science. - : Frontiers Media SA. - 2296-6463. ; 5
  • Forskningsöversikt (refereegranskat)abstract
    • Silicon (Si) is the second most abundant element in the Earth’s crust and is an important nutrient in the ocean. The global Si cycle plays a critical role in regulating primary productivity and carbon cycling on the continents and in the oceans. Development of the analytical tools used to study the sources, sinks, and fluxes of the global Si cycle (e.g., elemental and stable isotope ratio data for Ge, Si, Zn, etc.) have recently led to major advances in our understanding of the mechanisms and processes that constrain the cycling of Si in the modern environment and in the past. Here, we provide background on the geochemical tools that are available for studying the Si cycle and highlight our current understanding of the marine, freshwater and terrestrial systems. We place emphasis on the geochemistry (e.g., Al/Si, Ge/Si, Zn/Si, δ13 C, δ15 N, δ18 O, δ30 Si) of dissolved and biogenic Si, present case studies, such as the Silicic Acid Leakage Hypothesis, and discuss challenges associated with the development of these environmental proxies for the global Si cycle. We also discuss how each system within the global Si cycle might change over time (i.e., sources, sinks, and processes) and the potential technical and conceptual limitations that need to be considered for future studies.
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  • Resultat 1-7 av 7

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