Current Research in Arboriculture

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Current Research in Arboriculture Urban
Landscape Ecology

• Lecture 20

So where do we go from here?
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The ALE Laboratory
John Lab Director
Bryant M.S. Student
Javier Ph.D. Student
Steve M.S. Student
Clay M.S. Student
Not Pictured Yaniria, Ph.D. Student Jennifer,
M.S. Student (May 2004)
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ALE Research

• Organic matter nutrient cycling
• Decomposition mineralization
• Plant health
• Manipulating plant allocation strategies
• Enhancing stress resistance
• Sustainable management
• Urban forests, landscapes, and nurseries
• Forest prairie landscapes

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Existing Organic Matter
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Nutrient Cycling Organisms

• Soil microorganisms metabolize carbon
• Carbon limits microbial activity growth

Aber 1992 Mellilo et al. 1992 Wardle 1992
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Decomposition
Rapid

• Sugars, starches and simple proteins
• Crude proteins
• Hemicelluloses
• Cellulose
• Fats, Waxes, etc.
• Lignin

Slow
Cellulose, Peptides
Microbial Biomass
Plant Available Nutrients
Lignin, Phenolics
Microbial Biomass
Humus Formation
Haider et al. 1975, Brady Weil 1999, Martens 1999
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d
c
b
b
a
a
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Stress Resistance
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C/N 81
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C/N 251
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C/N 2501
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Prescription Mulches

• Adjust Carbon, Nitrogen, Phosphorus and other
  macronutrients by mixing waste products.
• Compost, wood waste, ash, mustard meal, animal
  manure
• Consistency
• Known results
• plant growth and stress resistance
• Widely available