Ozone-specific microscopic symptoms in the mesophyll cells and their relation to nutrient status of Norway spruce needles - a field study
2002
Kivimaenpaa, M. (University of Kuopio, Kuopio (Finland). Department of Ecology and Environmental Science) | Jonsson, A. M. | Stjernquist, I. | Sellden, G. | Suttinen, S.
The results showed that ozone specific symptoms can be detected in the needles of mature spruces in the southern Sweden with AOT40 considerably lower than the present critical level of 10 000 nl 1sup-1. The results could be expressed as an index per tree and needle generations, but also as a single value for forest stand allowing statistical tests. The results from this study support the general hypothesis and results from exposure and field studies that low nutrient concentrations or nutrient deficiency modifies the ozone response in plants. The results also show that together with low nutrition status ozone may affect the hardiness status of the needles
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