Student Research Reports

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The aim of the project was to investigate the biological importance of Marmont Alley in Karlovac, which is approximately 100 m away from Dubovac Elementary School. There are currently 102 plane trees growing in the alley, all marked with a stamp because the alley is a monument of park architecture. Marmont Alley is the beginning of the D6 road, which has been under reconstruction since 2019, and construction work has been carried out since then. Among the population of the Dubovac municipality where the alley is located, there have been concerns for a long time about possible damage to the tree-lined avenue during the construction works. The GLOBE group of the Dubovac Elementary School began measuring and observing in the alley in April 2021. At the same time, construction work was underway. Biometric measurements were performed according to GLOBE protocols (height and circumference of each tree), phenological measurements and observations, and additional measurements (leaf surface size to calculate the amount of oxygen produced). The measured values were sent to the GLOBE database. Based on the measured values of height and circumference of each plane tree, the amount of GW (green weight), DW (dry weight), amount of stored carbon, chest diameter and absorbed CO2 for each tree and total for all trees was calculated. For a tree of average size, the approximate value of oxygen produced in one hour and day in ideal temperature and pressure conditions with optimal humidity was calculated. Phenological observations and measurements took place on a plane tree selected as a phenological station, from March to November to determine the vegetation period i.e. the period of oxygen production and carbon dioxide absorption. This work proves that Marmont Alley is not only a monument of park architecture, but also an important biological factor in the city of Karlovac and the Municipality of Dubovac. The research obtained approximate values of the amount of stored carbon, absorbed CO2 and produced oxygen of one tree in one day in ideal conditions.