Khotimah, KhusnulWawanWardati2013-07-172013-07-172013-07-17Arnalishttp://repository.unri.ac.id:80/handle/123456789/4450Khusnul Khotimah.Jur.2013The increasing of material timber industrial will lead to extension of plantation forest area in peat soil. In natural peat land forest, condition of soil is always reductive and moist, soil reaction (pH) is very acid and content of nutrient N, P, K, Ca, Mg, K, Na is very low. Some activity in plantation forest will changes some chemical properties in peat soil. The purpose of this research was to know lands use change from natural forest to plantation forest Acacia crassicarpa on some chemical properties in peat soil. Method in this research was survey, with purposive sampling. Data was analysed by descriptive and graphics model. The parameters were pH, organic carbon, total nitrogen, total phosphor and base cations K, Ca, Mg, Na. The result of research show that land use change from natural forest to plantation forest Acacia crassicarpa will increasing some chemical properties in peat soil. The longer time of land use change will increasing some chemical properties in peat soil. The increasing is fluctuative, as pH, total nitrogen, total phosphor, and base cations K, Ca, Mg, Na, whereas for organic carbon increase is linierly.otherNatural forestplantation forestpeat soilchemical propertiesstudent Paper Post Degree