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Problem statement: The conversion of forest land into oil palm plantation is considered to&#13; be one of the causes of soil degradation and loss of tropical land forest in Southeast Asia. The&#13; objective of this study was to compare selected peat soil physical properties of secondary tropical peat&#13; swamp forest and oil palm plantation to determine the effect of forest conversion. Approach: Peat soil&#13; samples were collected from secondary tropical peat swamp forest and oil palm plantation at Batang&#13; Igan, Sibu, Sarawak, Malaysia. Experimental plots of 300 m3 were set up in both sites and thirty peat&#13; soil samples were collected randomly in both sites at 0-15 cm depth using a peat auger. Undisturbed&#13; cores and bulk samples were collected for analysis of bulk density and moisture content. Fiber content&#13; of the total mass of organic materials was determined by wet sieving method. Soil bulk density,&#13; moisture content, organic matter, mineral content, soil porosity and particle density were determined&#13; by standard procedures. Hydraulic conductivity was measured in the field using Model 2800K1&#13; Guelph Permeameter and soil strength was determined using Hand Operated Cone Penetrometer&#13; Eijkelkemp. Unpaired T-test was used to compare the variables of the two sites. Results: Both sites&#13; had similar degree of decomposition classified as hemic peat. No significant differences in fiber&#13; content, moisture content and particle density. Bulk density, mineral content and soil strength were&#13; significantly higher in the oil palm plantation while organic matter content, porosity and saturated&#13; hydraulic conductivity were significantly higher in the secondary tropical peat swamp forest.&#13; Conclusion: Conversion of secondary tropical peat swamp forest to oil palm plantation has&#13; significantly increased soil bulk density, mineral content and soil strength but significantly decreased&#13; organic matter content, porosity and saturated hydraulic conductivity. However, degree of&#13; decomposition, fiber content, moisture content and particle density were not affected by the&#13; conversion

Effect of Converting Secondary Tropical Peat Swamp Forest into Oil Palm Plantation on Selected Peat Soil Physical Properties