The Rimba Raya Biodiversity Reserve REDD Project

SoilA soil map for the Project Zone was produced using the SoilResource Exploration Map (Pontianak MA49, Centre for Soil andAgroclimate Research, Bogor, Indonesia) at a scale of 1:1,000,000(Figure 5). This map depicts Soil Mapping Units (SMU), whichrepresent an area with recognizable landform wherein similar soiltypes are likely to be found.Associated soil types in each mapping unit are summarized inTable 1. The great groups and general descriptions are derivedfrom Soil Taxonomy (Soil Survey, USDA 1999). Co-­‐dominant soiltypes derived from peat (SMU 3) and riverine alluvium (SMU 20)underly the Project Zone. Coarser-­‐textured sediment-­‐derivedsoils are also found in the north (SMU 52; possibly associatedwith kerangas vegetation on poorly draining psamments withsub-­‐surface hardpan) and the east (SMU 61).The soil map shows general agreement with the geological map,and RePPProT land systems. The map was first rectified usingLandsat 5 orthorectified imagery (path 119 row 62 02/07/1989)to adjust for major geographic errors. The resulting image showsvastly improved alignment with the Seruyan River and coastline.The image was then on-­‐screen digitized over the Project Zoneboundaries. Remaining differences are likely accounted for byresidual geographic inaccuracies and the fact that the base mapwas produced at a scale of 1:1,000,000. Further improvementscould be made based on Landsat interpretation or other imagery,but ultimately, field surveys may be required. There are noknown alternative soil maps available for this region.Figure 4. Surface geology of the Project Zone10