Abstract
In the Otways district, Vic., Eucalyptus obliqua exhibits a wide edaphic tolerance and evidence is
presented for the existence of ecotypes in this region.
A comparison of three populations from acidic loam, neutral sand and alkaline sand showed
significant differences in yield response when grown under glasshouse conditions. A tall open-
forest population, naturally occurring on fertile acidic loams (pH 4.6-5.2), showed a marked
reduction in yield, was severely chlorotic and developed red and necrotic patches on leaves when
grown on calcareous sands of pH 6.5 and 8.0. Open-forest and low open-forest populations native
to the sands of pH 6.5 and 8.0 respectively also developed some chlorosis, but maintained greater
yields, particularly on the soil of pH 6.5. Chlorosis in all populations was correlated with decreased
levels of chlorophylls a and b, and carotenoids; on soil of pH 8.0, all populations showed increases
in calcium, potassium, magnesium, sodium, phosphorus and the phosphorus/iron ratio in leaf tissue.
Populations showed differing contents of iron in seedlings (but with no particular trends), and the
low open-forest population developed a significantly low phosphorus/iron ratio when grown on
Leached calcareous soil of pH 6.5.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
27 articles.
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