Sodium and chlorine accumulation in snow, soil, and leaves: toxic effect on street trees (Tilia x vulgaris) | Na un Cl akumulācija Rīgas ielu apstādījumu sniegā, augsnē un liepu lapās
2007
Cekstere, G., University of Latvia, Salaspils (Latvia). Inst. of Biology; University of Latvia, Riga (Latvia). Faculty of Geography and Earth Sciences | Osvalde, A., University of Latvia, Salaspils (Latvia). Inst. of Biology | Nikodemus, O., University of Latvia, Riga (Latvia). Faculty of Geography and Earth Sciences
The study was conducted to determine concentrations of sodium and chlorine in snow, soil, and plants of street greenery in the central part of Riga (2004-2005), in relation to the toxic effect on street trees (tilia x vulgaris). Snow, soil, and leaf samples were collected from eight study sites (27 trees) in the central part of Riga with intense traffic and from a control site (three trees) located in a park area. Significantly increased levels of Na**+ and Cl**- in urban snow, soil, and leaf samples were found in comparison with the background values. There was close correlation between the Na**+, Cl**- concentration in the leaves, and the extent of leaf necrosis. The concentrations of Cl**- and Na**+ in damaged leaf samples were at least 6.6 times and 4.7 times higher in comparison with healthy tree leaves in the park.
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