Structural characteristics of plantations of black poplar selected clones (section Aigeiros duby)

This paper shows the numerical parameters of diameter and height structure of plantations of Eastern cottonwood (Populus deltoides Bartr) clones 457, 618 and S6-36 at two spacings (planting densities) on the sandy form of fluvisol after 24 years of plantation development. There is a significant difference in the main elements of plantation structure among the clones, i.e. the clones 457 and 618 are grouped in one group, while the clone S6-36 shows significant advantages. Planting density of 625 trees per hectare (4 x 4 m) was a limiting factor for the development of tree diameters and height, which caused the decrease of tree numbers after 24 years of plantation development.