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UID:20260125T025800EST-0371OoOnBG@132.216.98.100
DTSTAMP:20260125T075800Z
DESCRIPTION:Seminar by Dr. Christian von Sperber\, Geography Department\, M
 cGill University. Everyone is welcome to attend.\n\nPhosphorus (P) is an e
 ssential nutrient for all living organisms. In the terrestrial environment
 \, plants and microorganisms take up P as inorganic phosphate [PO43-] from
  the soil solution. Low [PO43-] concentrations in the soil solution often 
 limit biological growth and crop production. On the other hand\, excessive
  use of fertilizers can lead to an accumulation of P in soils\, which can 
 be transferred into water bodies causing the eutrophication of rivers and 
 lakes. Too little or too much P can thus present problems and it is import
 ant to enhance our understanding of the biogeochemical mechanisms that con
 tribute to the availability of [PO43-] in the soil solution. The most comm
 on way to quantify different biogeochemical soil P-pools is through sequen
 tial extractions\, which yields operationally defined pools that are used 
 to assess soil fertility and soil development. It is often assumed that ce
 rtain pools are bioavailable\, while others are not\, even though P is exc
 hanged among all pools. The oxygen isotope composition of phosphate is a u
 seful tool to translate quantitative information on P pools into informati
 on about P availability and to trace specific biological processes of the 
 P cycle which contribute to the availability of P. Applying this approach 
 promises new insights into the biogeochemical cycle of P\, both in agricul
 tural and non-agricultural systems.\n\nABOUT THE SPEAKER\n\nDr. Christian 
 von Sperber is an assistant professor in the Department of Geography at Mc
 Gill University in Montreal\, Canada. He completed his PhD in the Departme
 nt of Environmental Systems Sciences at ETH Zurich under the supervision o
 f Prof. Emmanuel Frossard and has worked as postdoctoral fellow in the Dep
 artment of Biology at Stanford University and in the Department of Agricul
 tural Sciences at the University of Bonn. His research focuses on the biog
 eochemical cycling of phosphorus in soils of agricultural and non-agricult
 ural systems.\n
DTSTART:20200220T163000Z
DTEND:20200220T163000Z
LOCATION:R3-045\, Raymond Building\, CA\, QC\, St Anne de Bellevue\, H9X 3V
 9\, 21111 Lakeshore Road
SUMMARY:Using oxygen isotopes as tracer for biological processes in the env
 ironmental phosphorus cycle 
URL:/macdonald/channels/event/using-oxygen-isotopes-tr
 acer-biological-processes-environmental-phosphorus-cycle-320375
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