An Approach to Estimate Individual Tree Ages Based on Time Series Diameter Data—A Test Case for Three Subtropical Tree Species in China

Accurate knowledge of individual tree ages is critical for forestry and ecological research. However, previous methods suffer from flaws such as damage, low efficiency, or ignoring autocorrelation among residuals. In this paper, an approach estimating the trees proposed based on diameter series Cinnamomum camphora (Cinnamomum (L.) Presl), Schima superba (Schima Gardn. et Champ.), Liquidambar formosana (Liquidambar Hance). Diameter were obtained by stem analysis. Panel data contains more information, variability, efficiency than pure time cross-sectional data, which why at stump breast heights chosen to form panel data. After choosing a base growth equation, constraint was added equation improve stability. The difference method used reduce parameter classification model suitability. Finally, increment a-classification developed. mean errors estimated height C. camphora, S. superba, L. 0.47, 2.46, −0.56 years root square 2.04, 3.15 2.47 years, respectively. For formosana, accuracy higher height. This highly accurate reliable, provides feasible way obtain field measurement.