1. INTRODUCTION
REDD+ aims at reducing emissions from deforestation and forest degradation, forest carbon stock enhancement, sustainable management of forests and forest conservation and requires a thorough forest monitoring. The carbon stock is generally derived from aboveground biomass (AGB) estimates by assuming a carbon content of dry biomass of 50% [1]. Peat swamp forests make a significant contribution to the carbon reservoir with the AGB and belowground peat deposits and are therefore a focus of REDD+. In Indonesia, peatlands cover 10.8% of the land surface and comprise app. 55 Gt of carbon [2];[3]. Many peatlands have been drained and deforested, mainly for agricultural development, thereby releasing carbon into the atmosphere. Indonesia emitted app. 518 Mt CO2 from peat decomposition in drained peatland in 2006 [4].