. 2020 Feb 10;10:2230. doi: 10.1038/s41598-020-58982-9

Table 3.

Allometric equations for the estimation of OP component dry weight (kg) and OP AGB accumulation models for OP on peat soils.

No	Component	Equation	Note
Derived Allometries
5	Frond DW	$D W_{F r o n d} = 0.060 \times P C S + 0.217$	Frond DW estimation using the petiole cross sectional area of a pruned frond.
6	Rachis DW	$D W_{R a c h i s} = 1.126 \times \frac{D W_{F r a g}}{L_{F r a g}} \times L_{R a c h i s}$	Frond DW estimation using the DW of a rachis fragment taken from a pruned frond.
	Frond DW	$D W_{F r o n d} = 0.176 + 2.267 \times D W_{R a c h i s}$
7	Frond DW	$D W_{F r o n d} = 0.562 \times L_{R a c h i s} - 0.767$	Frond DW estimation using rachis length.
8	Palm DW	$\begin{array}{l} D W_{P a l m} = 12.87 + 560.8 \times T_{V o l} \\ T_{V o l} = {(π \times 0.5 \times D B H)}^{2} \times L_{T r u n k} \end{array}$	Palm DW estimation derived from non-destructive trunk volume measurement. DBH measured excluding frond bases.
Derived Biomass Accumulation Models
P1	Aboveground Biomass (Mg ha⁻¹)	$A G B = 6.389 \times Y A P - 17.59$	AGB accumulation on peat – observed plantation biomass.
P2	Aboveground Biomass (Mg ha⁻¹)	$A G B = 7.992 \times Y A P - 26.29$	AGB accumulation on peat - ‘perfect plantation’ model. All palms are modelled as live and standing.

Allometric equations are derived from destructive harvest data at the study site. Where DW_Frond is frond dry weight (kg), PCS is the petiole cross sectional area (cm), DW_Rachis is rachis dry weight (kg), DW_Frag is rachis fragment dry weight (kg), L_Frag is rachis fragment length (m), L_Rachis is rachis length (m), DW_Trunk is trunk dry weight, T_Height is trunk height (m), DW_Palm is palm dry weight (kg), T_Vol is trunk volume (m³), DBH is the diameter at breast height (m) and YAP is years after planting.