Physiological, morphological and growth responses to rhizosphere hypoxia by seedlings
Morphological and physiological response to competition in ... › media › website › crops ›...
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Morphological and physiological response to competition in alder, eucalyptus and spruce
Susie Foreman
ShortFor project conference 11th December 2017
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• SRF in Ireland – establishment
• Response to competition
• Preliminary findings
Presentation content
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Objective: to study the effect of planting density on the growth and physiological responses of selected short-rotation forestry (SRF) species
PhD: Jan 2015-Dec 2018
Establishment of trial at Johnstown Castle
Establishment of experiments at Kinsealy Research Centre
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Species selected
Eucalyptus nitens (Shining gum) (EN)
Alnus cordata (Italian alder) (IA)
Picea sitchensis (Sitka spruce) SS
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Polytunnel experiment Purpose:
• maximise measurement
and experimentation period
• controlled conditions
• increased replications
• Inform trial measurements
Randomised block design 3 species and 3 spacings
Density – per pot
Low 1 plant Medium 4 plants High 8 plants
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Research completed at Kinsealy
Morphology
• Tree height • Stem basal diameter • Branch length and number • Specific leaf area Physiology
• Flushing and senescence • Light interception • Chlorophyll concentration • Photosynthesis Destructive sampling
• Biomass
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Morphology
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Specific leaf area and chlorophyll concentration
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Photosynthesis rate
PAR 1000 (µmol m-2 s-1)
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Biomass after 9 months growth
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Taken forward to field trial
• Stem height and basal diameter • Branch length • Extra - Green canopy depth
• Canopy position • Photosynthesis at PAR 1000 µmol m-2 s-1 • Chlorophyll concentration • Light interception analysis (LAI)
• Biomass?
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Field trial Johnstown Castle
Planted in June 2014
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EN 0.5X0.5
EN 1X1
EN 2X2
EN 2.5X3.0
IA 0.5X0.5
IA 1X1
IA 2X2
IA 2X3
SS 0.5X0.5
SS 1X0.5
SS 1X2
SS 2X2
Spacing
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Chlorophyll content in field conditions Shade leaves only
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PAR 1000 µmol m-2 s-1
Photosynthesis rates Shade leaves only
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• Effect of spacing on: • Growth
• Photosynthesis rate
• Biomass
Main findings
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• Species potential
• Inform silviculture practices for SRF
Initial spacing Rotation length Interventions Manipulations
Preliminary conclusions
Alder
Eucalyptus
Spruce
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Acknowledgements
Any questions