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TZUNTIL:20191027T010000Z
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DTSTART:20171029T030000
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RDATE:20181028T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t142904id
DTSTAMP:20260805T124310Z
DESCRIPTION:Silicon (Si) is the second most abundant element in the Earth's
  crust and involved in physiological processes of many organisms. For mari
 ne systems a clear interdependency between Si and both phosphorus (P) and 
 carbon (C) cycling was shown\, but for terrestrial systems less is known. 
 A large number of terrestrial (e.g. trees and grasses) and aquatic plants 
 (i.e. emergent and submerged macrophytes) accumulate substantial amounts o
 f Si in their tissues. Si is well known to have positive effects on plant 
 performance and stress tolerance e.g. from drought\, toxicants\, pathogens
  or herbivores. We found a strong decrease in Si availability with weather
 ing and large differences in tree Si concentrations between species. We co
 uld show that Si availability in soils affects P availability and thus the
  plant P status. In an experiment estimating Si effects on carbon and nutr
 ient release in peatlands we found a strong mobilization of nutrients and 
 mineralization of organic material by increased Si availability. This stro
 ng effect of Si on both P mobilization from mineral binding sites and resp
 iration of organic material was confirmed by our recent experiment for per
 mafrost soils. Our results indicate a change in iron mineralogy by Si mobi
 lizing P from strong binding to iron. In conclusion\, Si is a main factor 
 for plant and ecosystem performance in terrestrial systems by increasing P
  availability and C turnover.
DTSTART;TZID=Europe/Berlin:20171221T120000
DTEND;TZID=Europe/Berlin:20171221T133000
SUMMARY:Dr. Jörg Schaller\, Environmental Geochemistry\, BayCEER\, Universi
 ty of Bayreuth (Homepage): Silicon in biogeochemistry
TRANSP:TRANSPARENT
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