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A Modified Negative Exponential Curve For Estimating Growth Trends in Closed-Canopy Forests
Presented by Dr. Daniel DRUCKENBROD on 14 May 2013 from 11:15 to 11:35
Type: Oral Presentation
Session: Dendroecology I
A persistent challenge in tree-ring analysis is the extraction of a specific signal in the presence of other embedded signals. Overcoming this challenge is particularly important in closed-canopy forests where a substantial change in light availability between understory and overstory environments, in addition to growth and climate signals, affects tree growth rates. This presentation introduces a modification to the negative exponential curve commonly used to represent the growth trend. This modification allows the negative exponential curve to fit just an initial subset of ring-width measurements, enabling it to better isolate a decreasing growth trend by minimizing the effect of a subsequent release episode, which is often present in closed-canopy forests. This approach to growth trend estimation can also be combined with intervention detection to isolate canopy disturbance episodes to potentially disentangle growth, disturbance, and climate signals in these forests. Example applications of the modified negative exponential curve are shown for various closed-canopy forest types.