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- W2058871135 abstract "The objective of this study was to evaluate the predictive power of crown defoliation, assessed in 5% classes, in predicting year-to-year tree mortality. A visual analysis of Swiss Forest Health Inventory (SFHI) data suggested an exponential increase in the mortality rate with increasing defoliation. We verified this trend using a logistic regression model with defoliation, social position and their interaction as explanatory variables. We fitted our model to SFHI data for the years 1990–1997 (annual mortality rate=0.32%), and validated the model with data from long-term forest ecosystem monitoring sites for the years 1995–1998 (annual mortality rate=0.48%). Several indicators of prediction accuracy showed that regression models with total defoliation achieved 40–50% higher accuracies than models with unexplained defoliation, i.e. the portion of defoliation that field crews are unable to attribute to known causes. The logistic regression model with total defoliation correctly predicted 33% of the dead trees in the calibration data set, and 57% in the validation data set. This prediction accuracy was calculated with a deterministic method, using a predicted threshold probability above which trees were assumed to die. Our study suggests that including defoliation has the potential of considerably improving the prediction accuracy of models that predict tree mortality based on competition indicators and tree size alone." @default.
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- W2058871135 date "2001-02-01" @default.
- W2058871135 modified "2023-10-10" @default.
- W2058871135 title "Crown defoliation improves tree mortality models" @default.
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- W2058871135 doi "https://doi.org/10.1016/s0378-1127(00)00335-2" @default.
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