The visual uniformity of tropical peat swamp forest masks the considerable
variation in forest structure that has evolved in response to differences a
nd changes in peat characteristics over many millennia. Details are present
ed of forest structure and tree composition of the principal peat swamp for
est types in the upper catchment of Sungai Sebangau, Central Kalimantan, In
donesia, in relation to thickness and hydrology of the peat. Consideration
is given to data on peat geochemistry and age of peat that provide evidence
of the ombrotrophic nature of this Vast peatland and its mode of formation
. The future sustainability of this ecosystem is predicted from information
available on climate change and human impact in this region.