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SUMMARY:Abiotic and biotic controls on grassland carbon dynamics in changi
 ng environments
DTSTART:20111108T161500
DTSTAMP:20260506T205339Z
UID:d041e1c5d552097149c1f4082fdf89374e7c4beab8cc358f8a7af0a2
CATEGORIES:Conferences - Seminars
DESCRIPTION:Dr Michael Bahn\, Institute of Ecology\, University of Innsbru
 ck\, AT\nGlobal change has been identified as a major feedback mechanism o
 n the global carbon cycle. Two predominant components of global change\, i
 .e. changes in land use and climate have been taking place at particularly
  high rates in mountain areas. This talk will summarize major recent insig
 hts in effects of such global changes on the carbon dynamics of mountain g
 rasslands. It will be shown that the management intensity of grasslands ha
 s distinct effects on the net ecosystem exchange of CO2 between the ecosys
 tem and the atmosphere\, abandonment reducing its major flux components ph
 otosynthesis and respiration. The underlying coupling between these two fl
 uxes will be demonstrated from annual to diel timescales\, using comparati
 ve transect studies\, experiments and isotopic labelling. Implications of 
 land management (grazing and cutting) on the coupling of carbon fluxes wil
 l be discussed. It will also be shown that effects of gradual climate warm
 ing on soil CO2 emissions\, the largest source of CO2 from terrestrial eco
 systems\, are likely more strongly dependent on indirect effects of altere
 d photosynthetic assimilate supply than on direct warming effects on respi
 ratory processes. Finally\, emerging evidence from ecosystem manipulation 
 experiments testing effects of climate extremes (summer drought) on the C 
 dynamics of mountain grassland will be presented and discussed.
LOCATION:GR C0 01
STATUS:CONFIRMED
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