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S. Castillo., A. Soria., C. Ping., G. Michaelson., M. Leigh University of Alaska Fairbanks PowerPoint Presentation
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Google images 2011. Biochar Application to Subarctic Soils: Effect of biochar on microbial activity after freeze-thaw cycles and plant response at different application rates. S. Castillo., A. Soria., C. Ping., G. Michaelson., M. Leigh University of Alaska Fairbanks. Introduction.

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Google images 2011

Biochar Application to Subarctic Soils: Effect of biochar on microbial activity after freeze-thaw cycles and plant response at different application rates.

S. Castillo., A. Soria., C. Ping., G. Michaelson., M. Leigh

University of Alaska Fairbanks

introduction
Introduction
  • High latitude soils are weakly developed and are a challenge to producers (1)
  • Alaska has some has harsh climatic conditions that affect agriculture (2)
  • The demand for locally grown produce is gradually increasing .
  • Abundance of black spruce as feedstock.
research questions
Research questions
  • What are the differences among black spruce biochar created at different residence times?
  • What is the influence on microbial activity of soils amended with different biochar types and amounts before and after freeze-thaw?
  • What is the effect of black spruce biochar on plant yield and nutrient retention at different application rates?
picea marianna biochar
PiceamariannaBiochar
  • Five different types of biochar were created based on a response surface model conditions.
  • Black spruce biochar was produced in a pilot scale, fixed bed pyrolysis unit, with a capacity of 1 kg/hr
  • Temperature was maintained at 550 °C
  • Chemical analysis of samples
freeze thaw and charcoal effect on soil biota
Freeze-thaw and charcoal effect on soil biota
  • Forest fire charcoal presence on boreal forest has shown greater efficiency of nutrient uptake.( Wardle, 1997)
  • Freeze and thawing destroys microbial tissue (Haines, 1938)
  • Burst of CO2 during freeze and thaw (Ross,1972)
  • Soil goes through physical and chemical changes (DeLuca, 1992)
biochar influence on microbial activity before and after freeze thaw
Biochar influence on microbial activity before and after freeze-thaw

Methods:

  • Treatments based on a response surface model, constructed using Design Expert v7 software
  • Actively cropped soil and forest soil were collected from the Matanuska Experiment Farm
  • Microbial activity was measured with 8210-CO2 gas analyzer Columbus instruments 180 C.
  • Samples underwent 1 cycle of freeze-thaw .
remaining work
Remaining work

Google images

  • Amend soils with the optimal biochar and evaluate plant response.
  • Examine the physical change of biochar after freeze – thaw cycles.
summary
Summary
  • Residence time influenced the chemical characteristics of black spruce biochar specially at the shortest residence time.
  • Biochar treatments increased microbial activity especially on cultivated soils before and after freeze thaw. It stabilization after few days confirms that biochar can be a long term carbon storage on soils.
  • The response surface model indicated significance in all models except for forest soils before and after freeze-thaw.
questions

Questions

Thanks!

smcastillo@alaska.edu