Tolerance of Aesculus hippocastanum L. to foliar accumulation of chloride affected by air pollution

Fuhrer, J.; Erismann, Karl H. (1980). Tolerance of Aesculus hippocastanum L. to foliar accumulation of chloride affected by air pollution. Environmental pollution. Series A, Ecological and biological, 21(4), pp. 249-254. Elsevier 10.1016/0143-1471(80)90128-2

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The influence of air pollution, caused by emissions from motor vehicles, on the tolerance of Aesculus hippocastanum L. to foliar accumulation of chloride was investigated. Foliar accumulations of chloride reflect accumulation in soil as a result of successive winter applications of deicing salt (sodium chloride). Leaves of horse chestnut were sampled at different sites within the city of Berne, Switzerland, and analysed for chloride content and leaf necrosis. Areas of leaf necrosis were directly proportional to accumulations of chloride in the range 10 to 16 mg/g dry weight. As a measure of tolerance to accumulated chloride the concentration leading to a 25% necrosis of the total leaf area was determined. An ‘Air Quality Index’, calculated from the concentrations of carbon monoxide (CO) and nitrogen dioxide (NO2), was used to describe air pollution levels. Foliar accumulations of chloride were less damaging in more severely polluted atmospheres.

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