Abstract
During the first season, E. regnans develops a fairly strong tap-root, and later commences to produce
a system of laterals. Seedling shoot growth is slow at first but increases rapidly. In the sapling stage,
sinker roots develop from the laterals which extend far beyond the crown. Growth in height of the
tree is very fast. During the pole stage, the conical crown is well developed, sinker roots become
branched and the tap-root dies back. In the spar stage, the crown approaches maximum height and
expands greatly. The sinker and lateral roots become very well developed. During the long mature
stage, the fully elevated crowns become open and commence to die back. Buttresses are prominent
and a complex system of sinker roots is present. Overmaturity is marked by a very large trunk
epicormic growth and progressive die-back of the central area of both crown and roots.
On warmer and drier aspects the root systems of seedlings and pole stage trees appear to be less
well developed than on the cooler and moister aspects. On steep slopes, the root systems of pole stage
trees may develop asymetrically. Layering of prostrate trees may occur on southerly slopes and root
fusion between trees is relatively common. In swamps, vertical roots are short and trees are very
unstable.
Pornaderris aspera, one of the more common understorey species, develops a shallower and less
spreading root system than E. regnans. In the early stages the lateral roots of both species are shallow
and occupy the same soil zones; competition for moisture and nutrients is therefore likely to be
very intense.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
111 articles.
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