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Title Early diagnosis of forest decline. Interim report.CEH Staff publications
Name(s) Cape, J N (Neil)
Institute of Terrestrial Ecology
Physical Details 30pp
Publication 1990
Subjects T07059g5; CEH staff publication;
Files CEH Staff copy
Abstract 1. Norway spruce seedlings exposed to ozone and/or acid mist in open top chambers showed changes jn ultrastructure; ozone exposure caused damage to mesophyll cells, whereas exposure to acid mis caused stomatal malformation and redistribution of extra cellular calcium oxalate. Leaf surface wettability could not be used as a measure of treatment effects, as surfaces retained surfactant from insecticidal sprays. 2 . Effects of EL-OW i13g c ~ w dtiio rls an cuticle development in Norway spruce seedlings have been demonstrated by comparing; plants grown outdoors, in a greenhouse, and in controlled environment chambers. Plants grown out-doors were more wettable, and showed larger rates of uncontrolled water loss than plants grown indoors. 3 Amounts of leaf pigment have been measured during and after long-term exposure of Norway spruce seedlings to ozone in summer. The temporal vsriability in concentrations and ratios means that the use of pigment concentrations in diagnosing pollutant stress should be restricted to older needles {not current year) , and that seasonal variation should be explicitly considered when sampling, The use of iso-lutein / lutein ratios may be more informative than violaxanthin/antheraxanthin ratios, as previously suggested. 4. Studies on lipid composition of raonogalact.osy1 diglyceride through the year have also shown that results from older needles are more reliable in demonstrutjng pollutant effects. with significantly larger concentrations of A 9 , 12-18:2 (linoleic acid) t h a n A 5, 9- 18:2 in ozone exposed plants. Further analysis of data from the 1986 European survey has demonstrated links between nutrient ratios and visible decline symptoms. Apparently healthy needles from declining trees had larger ratios of S:Mg, N:K and K:Mg than needles from healthy trees. A 'risk index' for nutrient-related stress has been developed as a predictive tool. Results from Hgrtel's Turbidity test also showed significant differences between needles from 'h
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