Abstract
Peat soil is naturally formed from remains of plant tissue, with varying decomposition stages of organic matter. Impact of construction and condition of drainage canal on peat soil can alter peat soil characteristics. This study aimed to determine differences in soil characteristics in oil palm plantations due to modifying drainage conditions. Transect with a 300 m distance between points was implemented obtain 14 observation points to understand peat soil characteristics, water level. The results showed that in well-maintained drainage, sapric decomposition stage was >0.2 g/cm3, with C-organic of <48.20%, and specific gravity was 1.50. Water content and total pore space would be smaller if peat decomposition stage is more developed, with water content of <276.78% and total pore space of <81.13%. When drainage canal is not maintained, decomposition stage of surface layer (0-60 cm) is hemic and fibric, with volume weight is < 0.2 g/cm3, and C-organic > 48.20%, and has a specific gravity of 1.40 and 1.30. For water content and total pore space of peat soil, raw decomposition rate indicated water content > 304.81% and total pore space of > 81%. The use of peatlands for plantations needs to maintain peat conservation methods to avoid damages to physical properties of peat soils and peat ecosystems as a whole.
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