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TZID:Europe/Berlin
TZUNTIL:20031026T010000Z
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DTSTART:20011028T030000
TZOFFSETFROM:+0200
TZOFFSETTO:+0100
RDATE:20021027T030000
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DTSTART:20010325T020000
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DTSTAMP:20260920T160834Z
DESCRIPTION:Shifting cultivation is still a predominant form of landuse in 
 the tropics. In this landuse system soil fertility built up during natural
  fallows is used and depleted during a typically 3-5 year cultivation phas
 e which is initiated by slashing and burning the fallow vegetation. \n\nMe
 so-America has more than 1000 year history of shifting cultivation under t
 he traditional Mayan Milpa landuse system. Much speculation surrounds the 
 potential causes for the decline of the Mayan empire. Present day agricult
 ure still largely relies on traditional Mayan practices but yields are low
  and the sustainability of agriculture is questionable. Nutrient and organ
 ic matter cycling\, and land quality will be examined during the seminar i
 n the context of typical shifting cultivation systems in Meso-America and 
 elsewhere. \n\nMeasurable soil fertility on Meso-American limestone soils 
 is high\, but cultivation cycles are shorter than in much of the tropics a
 nd productivity is limited. Causes of this anomaly will be examined in the
  geochemical\, historical and cultural context of the region.
DTSTART;TZID=Europe/Berlin:20011122T161500
DTEND;TZID=Europe/Berlin:20011122T235959
LOCATION:H6
SUMMARY:Prof. Dr. Holm Tiessen\, University of Saskatchewan\, Saskatoon: Bi
 ogeochemistry of land use change in Meso-America
TRANSP:TRANSPARENT
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