Maie, N., Sekiguchi, S., Melling, L. Kimura, S.D., Sim, A., Shima, E.
Proceedings of the 14th International Peat Congress
biogeochemical-processes, dissolved-organic-matter-composition, long-term-monitoring, oil-palm-plantation, tropical-peat
Theme IX. Tropical peatlands
This study investigated the changes in the biogeochemical processes of tropical peat soil that has been reclaimed for oil palm plantation (OPP). We conducted a multi-year monitoring of the quality of dissolved organic matter (DOM) in the underground water of an OPP in Naman, Sarawak, Malaysia, a tropical rainforest climate with unclear wet and dry seasons. The dissolved organic carbon (DOC) concentration and the UV-Visible and fluorescence excitation-emission matrix spectra were measured. EEM was further statistically analyzed using the PARAFAC model. The DOM is shown to be composed of 6 fluorescence components with different behaviour. The quality of DOM varied seasonally and interannually. Some of these changes were explained relating to the seasonal and interannual variations in the underground water level that is brought about in response to seasonal precipitation.