The relatively open and diverse overstorey
and understorey structure of riparian swamp forest supported the highest number of spider species while closed canopy woodland and plantation sites supported relatively few (Fig.
3) in parallel with significant canopy decline across all mature age classes of the overstorey dominant, E.
Work investigating the effects of vegetation changes resulting from varied fire regimes on water availability for overstorey eucalypts is scant.
data) suggest that soil N accumulation in the absence of fire did not translate to increased N uptake by overstorey eucalypts in trials in Tasmania (E.
The main conclusions drawn from this review underpin our model of premature decline of temperate Australian overstorey eucalypts (Fig.
We highlight four clear parallels between the decline of northern American forests and Australian eucalypt forests in response to the long absence of fire: (1) the increased development of midstorey vegetation, the decline of fire tolerant tree species and the dominance of shade tolerant species; (2) increased total stand water use and increased mortality due to drought of fire tolerant/shade intolerant overstorey trees; (3) altered soil microclimate and microbial dynamics and; (4) increased occurrence and risk of wildfire in xeric P.
To redress this balance, Gordon and Reddell aimed to rehabilitate the Ranger site from the overstorey
down, by putting back the large canopy trees and allowing the understorey to re-establish itself.
Although the undisturbed native forest is not particularly diverse, rehabilitated areas typically are diverse, with many understorey and overstorey
The mean density of overstorey species of each plot was 740 trees/ha, with a mean height of approximately 10 m.
05), and between [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] concentration of overstorey litter and soil [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII] [R.
The C:N ratio of understorey leaf litter was approximately half that of overstorey leaf litter during the summer months (Table 1).
Between 5 and 10 years, the eucalypt overstorey
species begin to dominate and litterfall increases rapidly as many of the Acacia in the understorey senesce and die.