Classification of Soil Biosequences in Relation to Vegetation - I. Bijnor Plantation Division (U.P.)

Some soil biosequences occurring on a nearly similar toposequence have been classified with special reference to the role of natural vegetation on thier genesis. Sandy hyporthermic typic Haplumbrept and Ustochrepts are the major silviculturally important soils of this area. From the organic carbon content (Organic productivity turn-over) and its relative distribution along depth, comparision of base status in different horizons and clay migration, it appears that marks of grassy woodland ecotones on the genesis of Argiustoils are quite evident. Thick B-horizons, migration of clay, lower base saturation, gradual decrease in organic carbon and redistribution of exchangeable Ca and Mg possibly due to phytocycling among various horizons indicate the dominant role played by tree species in the comparatively more weathered habitats of Udic Haplustalfs. Silvicultural suitability of different taxas have been discussed.