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The element content of the leaves of tree and shrub species in the city

, : The element content of the leaves of tree and shrub species in the city. Botanikai Kozlemenyek 68(1-2): 95-106

The content of chemical elements of 13 tree and bush species was investigated in an urban environment (Budapest) and in a control area (Vacratot [Hungary]). The species were: Acer platanoides, Aesculus hippocastanum, Ailanthus glandulosa, Celtis occidentalis, Koelreuteria paniculata, Morus alba, Platanus acerifolia, Robinia pseudoacacia, Rosa rugosa, Sophora japonica, Syringa vulgaris, Thuja orientalis and Tilia tomentosa. Higher N content was demonstrated in the leaves of A. glandulosa, R. pseudoacacia and S. japonica, a higher Ca content in the leaves of C. occidentalis and a relatively higher K content in leaves S. japonica and S. vulgaris. In an urban-industrial environment the leaves of the trees contained certain micro- and ultramicroelements in greater quantities than in the control area. In Budapest, according to the total quantities of the micro- and ultramicroelements, R. rugosa, C. occidentalis, A. glandulosa, T. tomentosa, S. japonica and R. pseudoacacia had relatively higher Fe, Sr, Mn, Pb, Zn and Cu contents. In the leaves of the trees of Budapest, 42 micro- and ultramicroelements were detected, of which 17 were toxic (Bi, Pb, W, La, Ba, Sb, Sn, Ag, Nb, Zr, As, Ga, Zn, Ni, Co and Ti). The greatest numbers of micro- and ultramicroelements were detected in R. rugosa and T. orientalis. Some species were good indicators of metal pollution. For trees to be planted in the city, those species are suitable avenues that do not absorb Cl from the salted roads and that are able to accumulate great quantities of heavy metals present in urban aerosols and soils without exogenous damages, thus to decrease the toxic effects of the pollutants. Urban pollution was tolerated by those trees originating from East Asia (A. glandulosa, K. paniculata and S. japonica) and those from North America (C. occidentalis and R. pseudoacacia).

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