Assessing the Effect of Silviculture Treatments and Soil Quality on the Planted Dipterocarp Species after Enrichment Planting

Douglas Bungan, Ambun (2021) Assessing the Effect of Silviculture Treatments and Soil Quality on the Planted Dipterocarp Species after Enrichment Planting. Masters thesis, Universiti Malaysia Sarawak (UNIMAS).

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Abstract

An assessment after different silviculture treatment was conducted on the growth performance and survival of planted Dryobalanops beccarii on 2005 in Gunung Apeng National Park (GANP). Two study plots with different silviculture treatments and control plot were established namely T1 (bush slashing (control)) and T2 (selective girdling+ bush slashing). The growth performance of planted trees in terms of tree survival, total height and stem diameter were assessed for period of 72 months. Composite and undisturbed soil samples were collected at several random points within each study plots at 0-10 cm and 30-40 cm depth for the determination of soil physicochemical properties. Soil profile description was conducted in each plot to determine the morphological properties of the soils existing in the study area. The findings showed that the survival at T1 and T2 were 82.9% and 79.2%, respectively. Meanwhile, the average diameter and tree height recorded in T1 were 7.5 cm in diameter and 8.3 m in height, followed by T2 with 9.4 cm in diameter and 9.2 m in height. In terms of mean annual increment in diameter and height, T2 showed higher in MaiD and MaiH than T1 (p < 0.001). Then, the soil at the study area was acidic with a pH of less than 5, mostly sandy clayed in textural class and a moderate level of the nutrient. The type of soil at the study site was determined as grey-white podzolic soil which with strongly acidic with low nutrient content, deficiency moisture, and aeration. To conclude long terms effects of the selective girdling on the planted tree still rather insufficient due to other ecological factors.

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