Estimation of stem and leaf dry biomass using a non-destructive method applied to African Coffea species

Abstract

The coffee tree is an important economic
plant for several developing countries. Stem and leaf
dry biomass, which are key traits of plant production,
are used in functional-structural plant models to
simulate plant growth and predict yield. These values
are difficult to obtain since they classically rely on
time-consuming protocols and require destructive
measurements. Measuring stem and leaf dimensions
(length and width) to estimate them provides a nondestructive
and rapid approach for use in the field. In
this study we sought the best allometric relationships
existing between stem and leaf dimensions and their
corresponding dry mass in order to avoid destructive
measurements which are also time-consuming. This
was investigated in three coffee species: Coffea
canephora, Coffea liberica var. liberica and Coffea
liberica var. dewevrei in Ivory Coast. For each species,
the internodes and leaves of three axis categories
(stem, branch and branchlet) comprising the main
compartments were sampled. Two different equations
were found to estimate the stem and leaf dry mass
whatever the species and the axis categories: (1) a
linear equation for the relation between the stem
volume (V) and its corresponding dry mass (IWe),
IWe = 0.70 9 V and (2) a power law for the relation
between the leaf area [as the product of length (LL)
and width (Wi)] and its dry mass (LWe),
LWe = 0.007 (LL 9 LWi)1.02. Finally, stem and leaf
dry mass could be easily obtained without destructive
measurements. This method could be applied to
estimate the plant total leaf area and the total stem
and leaf biomass of a plant in an agroforestry system.

Keywords

Okoma et al 2016 – Allometries Coffea Agroforest Syst

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