Comparison of Soils and Leaves of Pacific Madrone and Their Relationship to Plant Pathology

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Comparison of Soils and Leaves of Pacific Madrone
and Their Relationship to Plant Pathology

• A.B. Adams and Rand Knight

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Introduction
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Objective of Study

• To determine what soil series grow Pacific
  madrone
• To determine nutrient variability of these soils
  and madrone leaves
• To determine if soil structure and nutrients
  (pools and available) are related to plant
  pathology

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Hypotheses

• HoPlant pathology and nutrients do not vary as a
  function of soil structure and nutrients

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Variation in Madrone Leaves as a Function of

• Seasonal variation within a healthy tree branch
• Annual variation within a healthy tree branch
• Variation between trees within a site
• Variation between sites of various soil series
• Variation associated with health or disease
  status of trees

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Healthy tree micronutrient phenological variation
of leaves

• B and Ni vary due to detection limits set with
  ICP
• Fe is higher in all ages, but varies as does Cu
• Zn and Mn are stable at all levels
• Mo was not detected

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Annual macronutrient variation in leaves on a
healthy tree (GSC)

• Ca increases, the others decrease with time
• Mobile elements are highest in youngest leaves
• K is highest in young leaves

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Annual micronutrient variation in leaves on a
healthy tree (GSC)

• Micronutrients increase or remain constant with
  on an annual basis
• Fe, B and Zn are higher than Cu, Mn Mo and Ni
• Cu levels are constant

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C levels are established and maintained, N
decreases with time
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Variation in Soils

• Successional trends from Fort Lewis
• Variation associated with series and structure

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Available Nutrients

• Cation exchange variation with series
• Cation exchange associated with a soil profile at
  a site with healthy trees (Arroyos)

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Conclusions