Common allometric equations for estimating the tree weight of mangroves

TLDR

The study collected inventory data on 104 mangrove trees from South‑East Asia to develop common allometric equations for trunk, leaf, above‑ground, and root weight. Using measurable dimensions (dbh, D R0.3, D B, H) and wood density, the authors derived trunk, leaf, above‑ground, and root weight equations, applying Shinozaki’s pipe model for leaf and above‑ground parts. They found trunk shape was consistent across species, wood density varied, and presented four universal equations for estimating mangrove tree weight.

Abstract

Inventory data on tree weights of 104 individual trees representing 10 mangrove species were collected from mangrove forests in South-East Asia to establish common allometric equations for the trunk, leaf, above-ground and root weight. We used the measurable tree dimensions, such as dbh (trunk diameter at breast height), D R0.3 (trunk diameter at 30 cm above the highest prop root of Rhizophora species), D B (trunk diameter at lowest living branch), and H (tree height) for the independent variable of equations. Among the mangrove species studied, the trunk shape was statistically identical regardless of site and species. However, ρ (wood density of tree trunk) differed significantly among the species. A common allometric equation for trunk weight was derived, when dbh 2 H or D R0.3 2 H was selected as the independent variable and wood density was taken into account. The common allometric equations for the leaf and the above-ground weight were also derived according to Shinozaki's pipe model and its extended theory. The common allometric relationships for these weights were attained with given ρ of each species, when D B 2 or dbh 2 or D R0.3 2 was selected as the independent variable. For the root weight, the common equation was derived from the allometric relationship between root weight and above-ground weight, since these two partial weights significantly correlated with each other. Based on these physical and biological parameters, we have proposed four common allometric equations for estimating the mangrove tree weight of trunk, leaf, above-ground part and root.