抄録
To investigate the quantitative relationships between increase in stem volume (SVI) and sunny crown dimensions for Hinoki cypress (Chamaecyparis obtusa ENDL.), we calculated the SVI per unit sunny crown dimension using three different sunny crown dimensions [i.e., volume (SCV), surface area (SCSA), and volume increase (SCVI)]. Samples were collected from six stands of even-aged Hinoki cypress in Nara Prefecture, Japan. For each SVI per sunny crown dimension, the mean among stands was compared. The SVI/SCV did not vary among the sampled stands, whereas the SVI/SCSA and SVI/SCVI varied with the stage of growth. Although our observed mean SVI/SCV was slightly larger than that in another region, the minimal difference observed between regions suggests that the SVI/SCV can be generally used to estimate the SVI of Hinoki cypress. Thus, SVI/SCV is an appropriate coefficient with which to estimate SVI.
