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DTSTART:20131027T030000
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RDATE:20141026T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t115113id
DTSTAMP:20260813T031752Z
DESCRIPTION:Since the 1970s\, when anthropogenic acidification was recogniz
 ed as a wide spread phenomenon in many European and North American areas\,
  tremendous progress has occurred in the documentation\, understanding\, a
 nd predictions of acid rain effects on element cycling in waters and soils
  and whole ecosystem functioning. In parallel with significantly reduced e
 missions of S (and also N in some regions)\, numerous terrestrial and aqua
 tic ecosystems have been significantly recovering from acidic stress (espe
 cially in central Europe) since the late 1980s.While the chemical recovery
 \, manifested by decreasing terrestrial export of H+\, strong acid anions\
 , base cations\, and ionic Al\, had been expected\, the rapid increase in 
 DOC leaching was a surprise\, not predicted by available models and previo
 us experience. Nitrate has become the dominant strong acid anion in terres
 trial export in some areas\, which increased scientific interest in N-satu
 ration. The increased DOC leaching\, N-saturation\, combined effects of cl
 imate change and atmospheric pollution on nutrient cycling in terrestrial 
 ecosystems\, and possible trajectories of their recovery have become new t
 argets of the present environmental research in the acidified areas. The n
 ew environmental models combine more individual cycles\, like gears in an 
 “ecosystem clock” and use them to explain observed changes in ecosystem fu
 nctioning. The future research should focus on deeper understanding of rel
 ative roles of these cycles in ecosystems.  For example\, elevated deposit
 ion of N and S compounds caused changes in soil fungi to bacteria ratio\, 
 decline in soil water pH\, and elevated availability of electron acceptors
  (SO42- and NO3-) in anoxic soil microsites. All these changes may individ
 ually have only relatively small effect on soil DOC concentrations. But th
 eir combined effect can reduce DOC availability to soil microorganisms to 
 such an extent that some microbial process shift from N to DOC limitation\
 , resulting in elevated NO3- leaching. The elevated terrestrial export of 
 NO3- is accompanied by Al leaching\, which affects P availability in aquat
 ic ecosystems. One change can thus affect cycles of many elements in the w
 hole system.
DTSTART;TZID=Europe/Berlin:20140130T000000
DTEND;TZID=Europe/Berlin:20140130T235959
SUMMARY:Prof. Jiří Kopáček\, Institute of Hydrobiology\, Biology Centre AS 
 CR\, Czech Republic (Homepage): Anthropogenic acidification\, recovery\, a
 nd nutrient cycling in terrestrial and aquatic ecosystems
TRANSP:TRANSPARENT
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