Ecophysiological Relationships

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Eco-physiological Relationships
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Eco-physiological Relationships
Leaf area Growth efficiency Foliar nitrogen
concentration Nitrogen use efficiency Preliminary
nitrogen budgets
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BWPE Bolewood Production Efficiency (ft3 ac-1
projected LAI-1 year-1)
Waycross
B.F. Grant
1 m3 ha-1 14.3 ft3 ac-1
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Waycross
B.F. Grant
Bolewood Prod. Eff. (ft3 ac-1 proj. LAI-1 yr-1)
Bolewood Prod. Eff. (ft3 ac-1 proj. LAI-1 yr-1)
1 m3 ha-1 14.3 ft3 ac-1
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Waycross
Nitrogen Use Efficiency (ton ac-1 stem growth /
ton ac-1 nitrogen
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1 ton acre-1 2245 kg ha-1
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1 ton acre-1 2245 kg ha-1
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Conclusions

• Large positive effect of fertilization on leaf
  area throughout stand development
• Decrease in growth efficiency with increasing
  stand age
• Increase in growth efficiency with fertilization
  when trees of equal size are compared

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Conclusions contd

• Fertilization causes continued increase in foliar
  nitrogen concentration with stand age
• Foliar nitrogen concentration and leaf area
  correlated
• Trends in nitrogen use efficiency similar to
  those for growth efficiency