Growth Models for Even-Aged Stands of Hesperocyparis macrocarpa and Hesperocyparis lusitanica

The cypress species Hesperocyparis lusitanica (Mill.) Bartel and H. macrocarpa (Hartw.) (formerly known as Cupressus C. macrocarpa) are widely grown in New Zealand where they noted for their high-value timber. Preliminary growth models were developed 2004 based on limited data. Here, we describe new stand-level these two using measurements from 521 permanent sample plots. Each model consists of several component sub-models including a height/age model, diameter/age mortality function volume function, with different parameter estimates used each species. mean top height is predicted age site index common-asymptote Richards models. Modified Korf functions to predict the diameter age, stand density index. volume-based 300 Index, defined annual increment at 30 years reference regime stems ha−1, can be calculated directly function. These will considerable value forest managers evaluation yield prediction. By more robustly describing productivity provide an improved framework understanding quantifying productivity.