Sapwood area and depth, and bark allometric measurements

Returns raw allometric data obtained for 14 spepcies from several North-American sites. These data are used to develop allometric equations for the parameters sapwood area and depth, as well as bark thickness. A detailed description on collection method and sites is provided in Pappas et al. (2021; in prep.). The parameters were measured along an increment core extracted at breast height (DBH, 1.3 $m$) with a Haglof borer. Bark thickness (Bark_cm) was measured directly, while sapwood depth (Sap_cm) was estimated through discoloration and translucence. Sapwood area (Saparea_cm2 was then calculated using: $$Saparea_cm = \pi (DBH/2 - Bark_cm)^2 - \pi (DBH/2 - Bark_cm - Sap_cm)$$