This paper aim is to present data from an experiment realized during the summer of 2022, on four ornamental species in the city of Timisoara. The data were taken from two urban habitats: urban and urban green. The investigated species were Acer negundo, Acer platanoides, Liquidambar styraciflua and Cotinus coggygria. These plant species are frequent on the roadsides or in parks, in the studied areas. The investigated index was chlorophyll content. This parameter was analyzed using a non-invasive approach, using OPTI-SCIENCES CCM-300 Chlorophyll Content Meter and the results were presented in mg m-2. Data processing was done using Microsoft Office Excel 2016 and statistical analysis was realized using PAST software v4.03. A total of 480 chlorophyll content samples were taken from all the species researched. Readings were taken from multiple types of leaves, from both those that appeared healthy and those that showed signs of chlorosis, from both research areas. It is a known fact that chlorosis is one of the signs that a leaf is not healthy, probably due to a physiological deficiency. This affection is mainly present in areas with a higher level of traffic such as urban areas. A symptom that can help identify the infected leaves was the appearance of small yellow spots that can spread over the entire surface of the leaf. From the collected data, a lack of chlorophyll was noticed within both investigated zones, but mainly in the urban area, where the levels of exhaust gas are higher compared to the ones in the urban green areas, which is in general a park. Thus, after the completion of Welch F test, it was observed that in urban area the level of chlorophyll was significantly reduced, when compared to the level from the urban green zone.

urban zone, chlorophyll content, urban green, adaptation, physiological indices

biology

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