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Abstract

This study aims to analyze the distribution of drainability assessment components, including Peat Basal Contact (PBC) and Natural Drainage Limit (NDL) elevations, Drainage Limit Time (DLT), and volume loss, as well as their relationship with peat thickness, subsidence, and groundwater level (GWL) in peatlands. The assessment is conducted to estimate the potential productive lifespan of oil palm plantations by determining the natural drainage limit (NDL) and predicting the time required to reach the drainage threshold, considering subsidence rates across different peat thickness classes. The analysis and calculations were performed using the drainage assessment formulas and procedures outlined by the Roundtable on Sustainable Palm Oil (RSPO). Consistent with our hypothesis, the results indicate that volume loss and DLT predictions are primarily influenced by peat thickness and GWL. Volume loss tends to be minimal in areas with thicker peat, while an increase in peat thickness and a shallower GWL extend DLT and reduce volume loss due to subsidence constraints. The findings also suggest that peatlands exceeding 3 meters in depth, classified under the protective ecosystem function category, require well-planned artificial drainage management to maintain productivity and mitigate the risks of peat degradation due to uncontrolled subsidence. A detailed water management approach is necessary to obtain accurate data on drainage time limits, which are closely linked to peat productivity. Integrating hydrological analysis with conservation management strategies is essential to ensuring the long-term sustainability of peatlands.

DOI

10.65844/2407-7860.1201

Pages

85-98

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