At the previously described central diagonal transects of each OP sampled plot, the heights of 10 randomly chosen palms were measured. Palm height was measured from the palm base to the base of the youngest fully expanded leaf (61). Estimation of aboveground biomass was based on palm height using the allometric equation for mineral soils (37)AGB OP=0.0923(height)+0.1333(1)

Belowground OP biomass was estimated according to the allometric model based on OP plantation age (Eq. 2) (62)BGB OP=1.45 (age)+9.88 (143 palms ha1)(2)

Biomass C stocks were estimated using a factor of 41.3% of above- and belowground OP biomass (62). Time-averaged C in OP biomass was estimated as the C stocks accumulated in the middle of one rotation cycle; thus, the biomass C stock in a 30-year-old OP plantation was divided by two (63).

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