mixed aged radiata prague presentation
TRANSCRIPT
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Mixed-aged radiata?
Andrew McCullagh, UCD, Ireland COST FP0603 - Short Term Scientific Mission
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Objective
To investigate whether Pinus radiata could grow successfully in a mixed-aged setting
Why?
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Method - Pinus radiata
• Main timber crop in NZ • Motive for project• Fire ecology
Burdon 2007 in Ecosystems of the World Vol 19
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Method - data
Consists of 2 cohorts• Stocking• Age-gap• Four sites
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Slide from Scion PSP Department
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DBH
Height
Survival
ITGMShula 1997 – Projecting Inventory Data (FRI)
Method - model
Assumptions
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Survival
Method - model
Logistic Equation
-Stand Density Index-Relative Density-Change in potential diameter
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Results
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Results
1. Cohorts tend towards low probability of survival – older cohort does better
2. High stocking reduces level of survival
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Results
1. Cohorts tend towards low probability of survival – older cohort does better
2. High stocking reduces level of survival3. Large age-gap – small reduction
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Re-Run
Simulation run again up to 40 years
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Conclusions
Mixed-aged Pinus radiata unlikely to succeed
Stocking is a factor
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Recommendations
Modify project to include a process such as light interception to strengthen results
Other species 3rd cohort
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Acknowledgements
• Supervisor – Dr Jennifer Grace• Staff at Scion• Cost