Box-ironbark forest

Box–ironbark forest is a forest or woodland ecosystem that is largely limited to central Victoria in south-eastern Australia. Because its component tree species produce abundant nectar and pollen throughout the year, it is important for the conservation of many species of birds and other animals.

Because box–ironbark forest lies mainly within the Goldfields region of Victoria, during the main years of the gold rush (1851-1870) it underwent intensive digging and clearing in the goldfields, accompanied by extensive timber cutting for infrastructure and firewood in surrounding areas. After the gold rush subsided the forests were still heavily cut for firewood and cleared for pasture.

Box–ironbark forest is found on rocky, often auriferous (gold-bearing), soils, in flat and undulating landscapes at altitudes of 150–600 m above sea level, and with an average annual rainfall of 500–800 mm. About 40% of the area formerly supporting the ecosystem in Victoria is public land with less than 20% protected in conservation reserves. About 55% has been permanently cleared for agriculture, mining and urban development. Remaining forest has been fragmented.

Box–ironbark forest is characterised by a canopy of box, ironbark and gum-barked eucalypts, growing to 25 m in height, over a sparse understorey of wattles, small-leaved and prostrate shrubs, herbs and grasses. The main trees are white box, red box, red ironbark, mugga ironbark, yellow gum and red stringybark. In some areas they may grow with, or be replaced by, yellow box, long-leaf box or silver bundy. The mix of plants in the groundcover includes the largest concentrations of orchids of any Victorian ecosystem. Small herbs and shrubs most abundant in, or largely restricted to, box–ironbark forests include Cheiranthera cyanaea, Philotheca verrucosa, Xerochrysum viscosum, Pultenaea largiflorens, Acacia williamsonii and Stuartina muelleri.

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