Abstract
Radial and vertical distribution of root biomass (gm) of Populus deltoids trees at early (2 & 3 years) and advanced age (6 & 7 years) were studied. In 2 or 3 years old P. deltoides trees the total root biomass decreased continuously with increasing radial distances from the tree base at all the soil depths. But it case of 6 and 7 years old trees the total root biomass increased in 50-100 cm than 0-50 cm distances and decreased in 100-150 cm distances. At early ages, the roots of the trees were mostly concentrated near the base of the trees but in the later ages the root system tended to proliferates uniformly around the trees. The total root biomass decreased continuously with increasing soil depth at all the radial distances and under all the age groups.
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