VARIATIONS IN ROOT BIOMASS AND EXTENT OF EXPANSION IN EUCALYPTUS CAMALDULENSIS, BOMBAX CEIBA AND POPULUS DELTOIDES ON PLANTING ALONG NORTH-SOUTH DIRECTION

摘要

The variation in root biomass and extent of expansion in Eucalyptus camaldulensis, Bombax ceiba and Populus deltoides on planting along north-south direction were studied at Punjab Forestry Research Institute, Faisalabad, Pakistan. The Trees were growing in lines adjacent to agricultural field along north-south direction with trenches along eastern and western direction. Each type of tree was replicated thrice and they were eight year old. Soil samples were collected up to a depth of 50 cm along northern and southern aspect at 1, 2, 3 and 4 metres. Roots were separated from the soil and weighed to measure biomass. P. deltoides had higher root biomass than E. camaldulensis and B. ceiba. Root biomass was high on the northern aspect of ￡. camaldulensis and 6. ceiba as compared to southern aspect and it decreased with increase in distance from the base of the tree. There was no difference in root biomass of P. deltoides between northern and southern aspects.