Without vegetation control, position in openings had little effect on the growth of planted white spruce; regrowth of lesser vegetation isolated seedlings from the microclimatic effects of overstorey treatment.
12.
Fire threats compound the issue, as Buffel grass growth is stimulated by burning, which not only raises the risk and severity of fires by increasing fuel availability, but also burns at higher temperatures than the Acacia overstorey can tolerate, which reduces and degrading the natural habitat.
13.
Infestation kills both the Jarrah overstorey and the original " Banksia " understorey, and over time these may be replaced by a more open woodland consisting of an overstorey of the resistant Marri ( " Corymbia calophylla " ), and an understorey of the somewhat resistant " Banksia sessilis " ( Parrotbush ).
14.
Infestation kills both the Jarrah overstorey and the original " Banksia " understorey, and over time these may be replaced by a more open woodland consisting of an overstorey of the resistant Marri ( " Corymbia calophylla " ), and an understorey of the somewhat resistant " Banksia sessilis " ( Parrotbush ).
15.
Until recently, forest regeneration practices in North America have largely followed an agricultural model, with research concentrated on techniques for establishing and promoting early growth of planted stock after clearcutting ( Cleary et al . 1978, Lavender et al . 1990, Wagner and Colombo 2001 ), followed by studies of growth and yield emphasizing single-species growth uninfluenced by overstorey canopy.
16.
The dominant overstorey is " Acacia melanoxylon ", " Acacia dealbata ", " Acacia pycnantha ", " Eucalyptus cephalocarpa ", " Eucalyptus cypellocarpa " ( in areas near Belgrave Lake Park ), " Eucalyptus goniocalyx " growing in and around Birdsland and Zig Zag Road, " Eucalyptus obliqua " growing through most of the area as well as in Belgrave South, " Eucalyptus ovata " which tends to grow in low-lying areas and " Eucalyptus radiata " which is quite common in the Belgrave South Primary school grounds with the very fine bark and peppermint smelling leaves.
