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Saplings of one clone of Norway spruce (Picea abies) were planted in pots and exposed to charcoal filtered (CF) air, non-filtered (NF) air or NF air plus extra ozone (NF+; ambient 1.4) in open-top chambers (OTCs). The lowest and highest ozone concentrations were combined with low phosphorus (LP) supply. Ambient air plots without OTCs, and with and without pots, were also included. A long-term study...
Microscopy has been used to diagnose the effects of air pollutants on conifers. As sampling may be slow, it is important to know whether the structure of needles changes during the day. Using light- and electron microscopy, diurnal changes in the structure of mesophyll cells of current year needles from 6-year-old Norway spruce saplings were studied on one day in early autumn, 1995. Saplings had been...
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