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UID:news26@ppe.duw.unibas.ch
DTSTAMP;TZID=Europe/Zurich:20180910T110727
DTSTART;TZID=Europe/Zurich:20181018T161500
SUMMARY:Claudia Hahn PhD defense
DESCRIPTION:The frequency of extreme weather events\, including droughts\, 
 is  assumed to increase in the near and far future leading to alterations 
 of  ecosystem productivity and thus the terrestrial carbon cycle. Although
   grasslands typically show reduced productivity in response to drought\, 
  their effects have been shown to vary quite dramatically. If the drought 
  response of temperate grasslands depends on when a drought event occurs  
 in the growing season was the main question of this study. For the  experi
 ment\, highly productive grasslands comprised of different grass  cultivar
 s were exposed to drought treatments that occurred either in  spring\, sum
 mer or fall in two consecutive years. The drought treatments  affected th
 e productivity of the grasslands in this study in all  seasons. The invest
 igated grassland cultivars were most resistant to  drought in the spring w
 hen productivity was highest\, while least  productive fall growth was mos
 t sensitive. We found no prolonged  suppression of growth after the end of
  the drought treatments. In  contrast\, growth rates after the end of the 
 drought treatments  outperformed the growth rates of the grasses in the co
 ntrols. Despite  the strong immediate effects of drought on grassland prod
 uctivity\, the  high resilience of the growth rates resulted in relatively
  small overall  seasonal drought-induced reductions in annual aboveground 
 net primary  production.
X-ALT-DESC:The frequency of extreme weather events\, including droughts\, i
 s  assumed to increase in the near and far future leading to alterations o
 f  ecosystem productivity and thus the terrestrial carbon cycle. Although 
  grasslands typically show reduced productivity in response to drought\,  
 their effects have been shown to vary quite dramatically. If the drought  
 response of temperate grasslands depends on when a drought event occurs  i
 n the growing season was the main question of this study. For the  experim
 ent\, highly productive grasslands comprised of different grass  cultivars
  were exposed to drought treatments that occurred either in  spring\, summ
 er or fall in two consecutive years. The&nbsp\;drought treatments  affecte
 d the productivity of the grasslands in this study in all  seasons. The in
 vestigated grassland cultivars were most resistant to  drought in the spri
 ng when productivity was highest\, while least  productive fall growth was
  most sensitive. We found no prolonged  suppression of growth after the en
 d of the drought treatments. In  contrast\, growth rates after the end of 
 the drought treatments  outperformed the growth rates of the grasses in th
 e controls. Despite  the strong immediate effects of drought on grassland 
 productivity\, the  high resilience of the growth rates resulted in relati
 vely small overall  seasonal drought-induced reductions in annual abovegro
 und net primary  production.
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