Performance of native and exotic species under various reforestation techniques in Sarawak
2004
Vincent, Alexander
Demographic data on Acacia mangium and six valuable native species namely Shorea macrophylla (De Vr.) Ashton. Dryobalanops aromatica (Gaertn.f.).Shorea parvifolia Dyer, Shorea pinanga Scheff., Shorea splendida and Scaphium macropodium from six differen sites of reforestation in Sarawak were analysed for mortality and growth rate.Mortality of A. mangium was significantly higher in trees smaller than 5cm dbh. Growth rate was observed to decrease with tree size for A. mangium. The mortality for native species was high ranging from 15-40%, between one and three years after planting Dryobalanops aromatica had the highest dbh growth rate of 0.93 cmyr-1, followed by S. macrophylla, S. splendida, S. pinanga and S. parvifolia with growth rates of 0.88, 0.72, 0.67 and 0.66 cmyr-1. Under different soil treatments, survival of two dipterocarp species (Dryobalanops aromatica and Shorea parvifolia) was not significantly different. The seedlings collar diameter (10 cm above ground level) and height growth was significantly different between species and among soil treatment. The highest increment in diameter of the two dipterocarps seedlings was observed in the treatment combining mulching with nutrient addition. Shorea parvifolia showed a significant difference in height growth among the soil treatments. Nutrient addition significantly increased growth of the dipterocarps seedlings. The sizes of planting hole have no significant effect on growth of the two dipterocarps seedlings.
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