The effect of different mixtures of NaCl and CaCl₂ on the silver fir (Abies alba Miller)

Abstract

Young potted silver firs were treated with six different mixtures of N.iCl and CaCK. Growtli was measured as well as the fohar contents of Cl, Na and Ca and tlic development of chlorosis and necrosis was recorded. At both concentration levels used, growth inhibition and needle necrosis were more pronounced in test conditions rich in CaCl2, a fact which is prtibably duo to Cl toxicity. AbstractRing characteristics of pine trees grown in polluted air showed up distinctly as a decrease in newly devised synthetic indicators such as product of W (relative ring width) and DD (relative difference between maximum and minimum density within a ring) or product of W and MD (relative mean density). Intensity of combined air pollution was estimated by the total of daily maximum concenu-ation of SO,, ozone, NO, and NO2. Since synthetic indicators show a significant correlation, at the over 98 % confidence level, with the intensity of combined air pollution, phytotoxicity of air to pine growth must be attributable at least in part to combined effect of air pollutants.

Effect of deicing NaCl and CaCl2 on spruce (Picea abies (L.) sp.)

“…This was not observed in the second ex- servations, it appears that the replacement of Na § by Ca 2+ reduces the toxicity. This is in contrast with some observations on Abies (Von Sury and Fliickiger, 1983). An explanation for this contradiction lies certainly in the way the CaC12 treatment was applied by these authors.…”

“…An explanation for this contradiction lies certainly in the way the CaC12 treatment was applied by these authors. When CaCI2 is given at an isoosmotical dose vs. NaCI, as it was done by Von Sury et al (1983), they also gave a 1.33 times more C1-. On the contrary, in our experiments the doses were isoequivalently calculated.…”