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. Tropical peatlands are one of the largest pools of terrestrial organiccarbon (OCterr); however, our understanding of the dynamics of OCterr inpeat-draining rivers remains limited, especially in Southeast Asia. Thisstudy used bulk parameters and lignin phenol concentrations to investigatethe characteristics of OCterr in a tropical peat-draining river system (themain channel of the Rajang and three smaller rivers: the Maludam, Simunjan,and Sebuyau) in the western part of Sarawak, Malaysian Borneo. The depletedδ13C levels and lignin composition of the organic matterindicates that the most important plant source of the organic matter inthese rivers is woody angiosperm C3 plants, especially in the three smallrivers sampled. The diagenetic indicator ratio, i.e., the ratio of acid toaldehyde of vanillyl phenols ((Ad∕Al)V), increased with decreasing mean grainsize of sediment from the small rivers. The selective sorption of acidrelative to aldehyde phenols might explain the variations in the (Ad∕Al)Vratio. Elevated (Ad∕Al)V values observed from the Maludam's sedimentsmay also be attributed to source plant variations. The (Ad∕Al)V ratioappears to be related to the C∕N ratio (the ratio of total organic carbon tototal nitrogen) in the Rajang and small rivers. In small rivers, a quickdecline of C∕N ratios is a response to the slower modification of (Ad∕Al)V ratiosdue to better preservation of lignin phenols. An accumulation oflignin phenols with higher total nitrogen percentages (TN%) in the studiedsystems was observed. Most of the OCterr discharged from the Rajang andsmall river systems was material derived from woody angiosperm plants withlimited diagenetic alteration before deposition and thus could potentiallyprovide significant carbon to the atmosphere after degradation.

Distribution and degradation of terrestrial organic matter in the sediments of peat-draining rivers, Sarawak, Malaysian Borneo