A simple method for leaf and branch biomass estimation in Japanese cedar plantations

Abstract

Leaf and branch biomass in middle-aged Japanese cedar plantations can be accurately estimated using a simple method based on the pipe model theory. A simple method for estimating leaf and branch biomass is needed to properly manage forests of Japanese cedar, a major timber species in Japan. We developed a simple method, based on the pipe model theory, in which leaf biomass was estimated from tree height, height at the crown base, and stem area at breast height. The applicability of the method was examined in Japanese cedar plantations along a topographic gradient in five areas. In middle-aged forests ( 80 years) in Chiba, leaf biomass per unit stem area at the crown base differed between six forests and was lower in larger trees within a particular forest. We conclude that the method investigated herein is applicable to middle-aged forests, but it needs to be modified for application to old forests.