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TZID:Europe/Berlin
TZUNTIL:20171029T010000Z
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DTSTART:20151025T030000
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RDATE:20161030T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t127723id
DTSTAMP:20260811T064110Z
DESCRIPTION:Soil element cycling is the basis for many important soil funct
 ions and is largely driven by microbial activity. In the talk\, I will pre
 sent recent findings on two aspects of soil element cycling\, namely organ
 ic phosphorus (P) mineralization and microbial carbon (C) allocation in so
 il. Special attention will be given to the rhizosphere and in the soil org
 anic layer because these sites are hotspots of element cycling.\nThe rhizo
 sphere is a spatially highly organized microsite in soil. Based on a novel
  imaging method for exoenzyme activity in soil it was possible to identify
  the distribution of phosphatase activity that catalyzes organic P mineral
 ization. Further\, it was found that microbial and plant phosphatases reac
 ted differently to P availability. Using isotopes\, it could be shown that
  microbial phosphatase activity and organic P mineralization can be stimul
 ated by root exudates. Moreover\, it was demonstrated that microbial organ
 ic P mineralization can be driven by microbial need for C.\nThe ratios of 
 C-to-nutrients in soil strongly affect microbial C processing. Microbial r
 espiration rates per unit microbial biomass were positively correlated wit
 h C-to-nutrient ratios and decreased with soil depth. In order to elucidat
 e microbial C allocation a new method was developed that allows to calcula
 ted microbial carbon use efficiency\, defined as the ratio of organic C al
 located to growth over organic C taken up by the microbial community. The 
 method revealed that microbial carbon use efficiency is not affected by so
 il depth and organic matter quality but by nitrogen (N) availability.\nTak
 en together\, the talk will present new insights into the interactions of 
 the cycling of C\, N and P\, and will discuss the role of stoichiometry fo
 r soil element cycling.
DTSTART;TZID=Europe/Berlin:20160121T120000
DTEND;TZID=Europe/Berlin:20160121T133000
LOCATION:H6\, GEO
SUMMARY:Dr. Marie Spohn\, Soil Ecology\, BayCEER\, University of Bayreuth (
 Homepage): Organic phosphorus mineralization and microbial carbon allocati
 on in soil
TRANSP:TRANSPARENT
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