Determining Ideal Timing of Row Thinning for a Cryptomeria japonica Plantation Using Event History Analysis

摘要: Effective time of thinning is essential for determining a silvicultural operation schedule. One the most commonly used methods percentage radial increase to assess effect thinning. However, it difficult determine ideal point due variation in tree growth rates. Event history analysis was quantify optimal timings different row types 45-year-old Cryptomeria japonica plantation mountainous region Taiwan. The tree-ring size measured and converted basal area increment (BAI) estimate annual growth; derived time-series data were entered into event calculate 50% probability survival. Additionally, an accelerated failure regression applied test effects its timing; model validation carried out examine influence on plant through time. Results showed that modified temporal dynamics BAI, and, general, positive trend observed between strip-width Simulated corroborated accurate timing may optimize effects. Combining measurement facilitate thinning, which can improve carbon sequestration forest stands.