mixed aged radiata prague presentation
Post on 14-Jul-2015
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Mixed-aged radiata?
Andrew McCullagh, UCD, Ireland COST FP0603 - Short Term Scientific Mission
Objective
To investigate whether Pinus radiata could grow successfully in a mixed-aged setting
Why?
Method - Pinus radiata
• Main timber crop in NZ • Motive for project• Fire ecology
Burdon 2007 in Ecosystems of the World Vol 19
Method - data
Consists of 2 cohorts• Stocking• Age-gap• Four sites
Slide from Scion PSP Department
DBH
Height
Survival
ITGMShula 1997 – Projecting Inventory Data (FRI)
Method - model
Assumptions
Survival
Method - model
Logistic Equation
-Stand Density Index-Relative Density-Change in potential diameter
Results
Results
1. Cohorts tend towards low probability of survival – older cohort does better
2. High stocking reduces level of survival
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
Re-Run
Simulation run again up to 40 years
Conclusions
Mixed-aged Pinus radiata unlikely to succeed
Stocking is a factor
Recommendations
Modify project to include a process such as light interception to strengthen results
Other species 3rd cohort
Acknowledgements
• Supervisor – Dr Jennifer Grace• Staff at Scion• Cost
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