抄録
In Sarawak, Malaysia, simple methods for estimating the leaf area of sago palms were examined using a total of eight leaves of the lower, middle, and upper three leaves for first and seventh year plants after trunk formation and the middle and upper two leaves for fourth year plant after trunk formation. Taking into account the positions of attachment from the lower to the upper of the eight leaves, the leaf area of half of the leaflets was actually measured, and this was doubled to obtain the measured leaf area (A). For each leaf, three methods of estimating leaf areas—(B) the longest-leaflet area × the number of leaflets, (C) the longest-leaflet length × the maximum width × the number of leaflets, and (D) the longest-leaflet SLA (specific leaf area) × leaflet weight per leaf—were applied, and the leaf areas were determined and compared with the measured leaf area (A). The average A/B, A/C, and A/D values of the eight leaves were 0.65, 0.54, and 1.03, respectively, and the coefficients of variation were as low as 3.7–8.7%. From these results, it seemed that the leaf area of the sago palm can be easily estimated by multiplying the values obtained with methods (B) to (D) mentioned above by the correction factors of 0.65, 0.54, and 1.03, respectively.
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