Abstract
Summary The severe 1990/91 winter provided an opportunity to quantify the effects of de-icing salt on the roadside trees of London. Between late July and mid September 1991, 25 paired main road and side road plots were established in the London area. Each plot consisted of 30 roadside trees, giving a total of 1,500 trees. London plane (Platanusx hispanico) comprised 25 per cent of the main road and 19 per cent of the side road trees. Common lime (Tilia x europea), small-leafed lime (T. cordata) and flowering cherries (Prunus spp.) were also abundant. From records of the distances traversed in order to assess the trees, estimates of the total roadside tree populations were produced. One hundred and forty two main road and 70 side road trees showed current salt damage. By extrapolation this amounts to over 20,000 roadside trees in the London area. The most frequently damaged species was London plane; 39 per cent of the main road and 30 per cent of the side road trees being affected. With this species damage...
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