Changes in the Environment and Ecology and Toolik Lake, Alaska

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Changes in the Environment and Ecology and Toolik
Lake, Alaska

• Data Assembled by John Hobbie
• The Ecosystems Center, MBL, Woods Hole, MA

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• Note that data summarized here have been
  collected by many
• investigators and funded by a number of agency
  programs
• beginning in 1975. Special thanks to Mat
  Williams, Ed Rastetter,
• Gus Shaver, Vlad Romanovsky, John OBrien, Neil
  Bettez,
• Larry Hinzman, Doug Kane, Skip Walker, and Linda
  Deegan.
• NSF Office of Polar Programs, Arctic Natural
  Sciences
• NSF Office of Polar Programs, Arctic Systems
  Science
• NSF Office of Polar Programs, ITEX
• NSF Division of Environmental Biology, LTER
• NSF Division of Environmental Biology,
  Ecosystems Program
• Department of Energy

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1999--1Oth year of treatmentGREENHOUSE ONLY

• GREENHOUSE PLUS NP FERTILIZER

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B
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• CONCLUSIONS
• The increase in air temperature of two degrees C
  is well documented
• Stream and lake chemistry, permafrost
  temperatures, and the abundance of plant species
  show significant changes since 1975
• Process measures of natural and experimental
  ecosystems allow modeling predictions for the
  next 150 years of slow changes in the carbon
  cycle.
• The response of the environment and ecosystems
  is slow and difficult to measure even over three
  decades
• A number of intensive, cooperating,
  multidisciplinary study sites must be established
  in addition to the 3 or 4 already in existence
  (Toolik, Barrow, Zackenberg, Abisko)

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