A test was undertaken of a system which predicts eucalypt plantation wood volume yields in Tasmania from a set of eight topographic, climatic and soil variables measured at a site. The system was tested in 32 plots located in plantations of E. globulus and E. nitens in northern Tasmania. When the system predicted that a site had high productivity (maximum mean annual increment
Soil properties and earthworm population density were examined for 5 forest
soils derived from Silurian-Devonian sandstones (Mathinna Beds) in
north-eastern Tasmania. The soils occur along gradients of altitude, rainfall,
and forest type; they include 2 with texture-contrast and 3 with gradational
soil profile types. The density and biomass of the most abundant earthworm
species Megascolex montisarthuri, and of all earthworm
species combined, were found to be greater in gradational than in
texture-contrast soils. A greater proportion of the earthworms in gradational
soils than in texture-contrast soils was found to occur at soil depths
exceeding 10 cm. The contrast was most pronounced between the 2
texture-contrast soils and the single gradational soil that occur under dry
eucalypt forest. This paper explores the hypothesis that bioturbation of
surface and subsurface layers by earthworms is an important mixing process
that in gradational soils outweighs the counter tendency for soil particles to
sort and thus form texture-contrast profiles.
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