This paper explores the hypothesis that the action of stressors changes the state of mineral content at different stages in the leaf development in urban environment, in sites close to the major traffic roads. We evaluate a low-cost method to assess urban habitat quality with relatively easy sampling and no need for complicated and expensive equipment. The method is based on quantifying gravimetric (leaf dry weight – LDW, oganic weight in leaves – LO, ash weight in leaves – LA) and physiological (leaf mineral content – LMC, leaf organic content – LOC, leaf organic content/leaf mineral content ratio – LOC/LMC, leaf mineral deposition in tissues – LTDM) parameters. These parameters are relatively simple, accurate, and inexpensive and can be quickly determined. Kruskal–Wallis tests were used in order to compare LDW, LA, LO, LMC, LOC, LTDM and LOC/LMC among the eight species (Acer platanoides, Acer pseudoplatanus, Tilia platyphyllos, Tilia tomentosa, Aesculus hippocastanum, Aesculus × carnea, Taxus baccata, Picea abies). All these species are considered as valuable forest and decorative ones recommended for planting in the green zones of the towns. These tree species are easily identified, widely distributed, and widely used in bioindication studies. The variable mineral content within leaves can be explained by environmental effects, as well as by the physiological differences between species. Species that exhibit phenotypic plasticity with respect to these parameters (Acer platanoides, Acer pseudoplatanus, Tilia platyphyllos, Tilia tomentosa) reflect changes in the urban environment. With a high mineral content, A. carnea is more suited for the urban environment than A. hippocastanum. Taking into account the existing conditions in Timisoara, we consider evergreen species (T. baccata, P. abies) to be inadequate for cultivation in areas with heavy road traffic because they show stability in leaf mineral content.

本文探讨了以下假设：在靠近主要交通道路的城市环境中，压力源的作用会改变叶片发育不同阶段矿物质含量的状态。我们评估了一种低成本的方法来评估城市栖息地质量，且采样相对容易，不需要复杂而昂贵的设备。该方法基于量化重量（叶干重– LDW，叶片中的有机重量– LO，叶中灰分– LA）和生理性（叶片矿物质含量– LMC，叶片有机物含量– LOC，叶片有机物含量/叶片矿物质含量）比率– LOC / LMC，组织中的叶片矿物质沉积– LTDM）参数。这些参数相对简单，准确且便宜，并且可以快速确定。使用Kruskal–Wallis测试来比较LDW，LA，LO，LMC，LOC，挪威枫，宏基pseudoplatanus，椴platyphyllos，银毛椴，欧洲七叶树，七叶树×吉祥草，欧洲红豆杉，欧洲云杉）。所有这些物种被认为是有价值的森林和装饰性物种，建议在城镇的绿色地带种植。这些树种易于识别，分布广泛，并广泛用于生物指示研究中。叶片中可变的矿物质含量可以通过环境影响以及物种之间的生理差异来解释。在这些参数上具有表型可塑性的物种（宏柏，Acer pseudoplatanus，Tilia platyphyllos，Tilia tomentosa）反映了城市环境的变化。由于高矿物质含量，角果曲霉比河马曲霉更适合城市环境。考虑到蒂米什瓦拉的现有条件，我们认为常绿树种（T. baccata，P. abies）在道路交通繁忙的地区不适合种植，因为它们显示出叶片矿物质含量的稳定性。