Author:
Bennett L. T.,Attiwill P. M.
Abstract
Banksia integrifolia L.f. has been in decline on
calcareous sands of the Yanakie Isthmus, southern Victoria, since early 1980.
Early studies indicated that the decline is associated with a particular soil
condition possibly a nutritional imbalance involving Fe. However, in foliage
samples collected from the three main soil types of the Isthmus, declining
trees had similar concentrations of Fe but lower concentrations of Ca than
healthy trees. Comparisons were made of seasonal variation in concentrations
of macro- and micro-nutrients in foliage and litterfall from healthy trees (to
minimise secondary changes associated with decline) within healthy and
declining sites on the same soil type. On average, litterfall and the nutrient
content of litterfall was greatest within the canopy area of
B. integrifolia of the healthy stand. Banksias of the
healthy stand also had greater concentrations of N, P, K and Na in
fully-expanded leaves, resorbed greater proportions of phloem-mobile nutrients
from senescent leaves and accumulated more Ca in senescent leaves. However,
there was no evidence of nutritional imbalance in healthy trees within
declining stands. It is argued that the lower foliar Ca in declining trees on
three soil types and lower nutritional status of healthy trees within
declining stands were due to lower productivity and lower water use and were
therefore a result or an indication of decline rather than a cause.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
11 articles.
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