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The effects of the climate characters and climate index calculated by Thornthwaite-Mather method on diameter increment of Austrian pine trees in the seedling seed orchard on Jelova Gora was studied in the period from 1996 to 2002. The samples for dendrometric analysis were taken from 498 trees in 40 half-sib lines originating from the best natural sites of this species. A strong correlation was determined between the range of precipitation regime and Thornthwaite-Mather climate index, and the development of current diameter increment. The study results indicate that the diameter increment of Austrian pine increases considerably with the increase of humidity, regardless of the relatively modest demands regarding the site productive characteristics.

Variability of height increment and the most important climate elements were researched in the Austrian pine seed orchard on Jelova Gora during the period 1993-2003. The seed orchard was established in 1991 by the principle of meta-population structure. The comparative analysis of the above elements shows the correlation between height increment, as the element of tree growth, and climate parameters, which is significant for the correction of the previous opinions that Austrian pine does not have a biological predisposition for the full utilization of the high production potentials of beech sites.

The introduction of allochthonous species enriches the trees and shrubs of the country and leads to the phenomenon of the secondary range of cultivated species, which differs very much from species to species. The amorpha (Amorpha fruticosa L) range characteristics are presented, the species which has a very expressed tendency of subspontaneous spreading in Serbia. The inventory was performed by the stationary and marshroute investigations of the species coenosis.

The knowledge of trees at the beginning of the 21st century cannot be compared to that in the early fifties of the 20th century. Trees are characterized by longevity, adaptation, high variability, very complex organization, not only morphological, anatomical, physiological, but also at the genetic level. The effect of functional diploidisation of woody polyploids on genetic organization of actual diploids (secondary, tertiary and quaternary) has been dealt with. The process of diploidisation has a huge evolution and technological potential.