The external defects and the particularities of the trees crowns located into the green areas of Braşov

Abstract

The analysis of the defects detected at the standing trees, located into localities, is very important because in this way it can highlight potential risk at the mature trees, especially at those who are isolated and whose growth is influenced to a large extent by human intervention. Besides the indisputable beneficial effects of the trees, a green areas indispensable component of the localities, they, after a certain stage of development, may present a very high potentially of risk in areas where they are located. Potential level of risk is given in a largely of morphological features of trees reached adulthood.

Based on this finding the authors have proposed to highlight some features of the defects and to study the asymmetry of the crowns for the trees located on streets, in the Brasov city. In the conducted research was included a batch of 259 trees of next species: common linden (Tilia cordata Mill.), Norway maple (Acer platanoides L.), sycamore (Acer pseudoplatanus L.) and horse chestnut (Aesculus hippocastanum L.).

From the results of the research it must be specified that the highest frequency of curvatures and knots appears at Acer pseudoplatanus, and the highest frequency for ovality, forking, hollows and frost-crack at Acer platanoides.

Regarding the crown asymmetry it was found that the ratio between the maximum radii length and minimum radii length of a tree is between 3.68 and 9.57. This aspect associated with the greater values of standard deviations, in many cases greater than 40%, leads to the conclusion that this parameter should be analyzed by taking into account other influencing factors.