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NVIS Fact Sheet MVG 19 – Tussock Grasslands

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NVIS Fact Sheet MVG 19 – Tussock Grasslands NVIS Fact sheet MVG 19 – Tussock grasslands Australia’s native vegetation is a rich and fundamental • comprise natural areas of grassland, as well as vast areas element of our natural heritage. It binds and nourishes of native grasslands derived from woodland vegetation our ancient soils; shelters and sustains wildlife, protects in which most or all of the tree and shrub cover has been streams, wetlands, estuaries, and coastlines; and absorbs removed. The structure and species composition of these carbon dioxide while emitting oxygen. The National derived grasslands may resemble some of those described Vegetation Information System (NVIS) has been developed here, although mostly they are derivatives of MVGs and maintained by all Australian governments to provide 5 and 11 a national picture that captures and explains the broad • were in existence before European colonisation when diversity of our native vegetation. natural temperate lowland grasslands occupied large areas of This is part of a series of fact sheets which the Australian south-eastern Australia, most notably on the southern Government developed based on NVIS Version 4.2 data to tablelands of New South Wales, basalt plains of western provide detailed descriptions of the major vegetation groups Victoria, in southern South Australia and in the Riverina (MVGs) and other MVG types. The series is comprised of region of New South Wales and Victoria a fact sheet for each of the 25 MVGs to inform their use by planners and policy makers. An additional eight MVGs are • in tropical and arid regions cover extensive black available outlining other MVG types. soil plains in central and northern Queensland, the Northern Territory and Western Australia For more information on these fact sheets, including • may be dominated by grass species with C3 or its limitations and caveats related to its use, please see: C4 photosynthetic pathways or a mixture of both, ‘Introduction to the Major Vegetation Group (MVG) depending on temperature regimes and aridity fact sheets’. • are fire-prone and able to regrow rapidly after being burnt Overview • have species that lack persistent soil seedbanks • Cattle and sheep grazing has been the major land use in Typically, vegetation areas classified under MVG 19 – tussock grassland since settlement. Tussock grasslands: • represent treeless communities dominated by native perennial tussock grasses widely distributed over seven per cent of the Australian continent through arid, temperate and tropical areas Temperate Tussock Grasslands of Rytidosperma and Austrostipa species, Ivanhoe, NSW (Photo: B. Pellow) SSD18S.0117 environment.gov.au Facts and figures Structure and physiognomy • Grasslands are characterized by large perennial tussock MVG 19 - Major Vegetation Group grasses, broad-leaved and lilioid herbs in the inter Tussock grasslands tussock spaces and a lack of woody plants. In localised 34. Mitchell grass (Astrebla) areas, forbs may dominate the tussock grasses. tussock grasslands • Grasses have modular growth forms that grow as single 35. Blue grass plants in clumps, tufts or bunches, rather than forming a (Dicanthium) and tall continuous lawn or meadow. bunch grass (Vitiveria • The growth and reproductive phenology of C3 and Major syn: Chrysopogon) C4 grasses depends on temperature and photoperiod – Vegetation Subgroups tussock grasslands the C3 grasses grow mainly in spring and autumn and the C4 grasses grow mainly in late spring-early summer, 36. Temperate as soil moisture levels permit. tussock grasslands • Although the dominant grasses are perennial, some 37. Other annual grasses may also be present. tussock grasslands • Some areas of grassland are the result of extensive Closed Tussock Grassland clearing of woodland communities that had a high grass (mid, low) component in the ground layer. The Riverina region of New South Wales is generally considered to have been Typical NVIS Open Tussock Grassland originally dominated by woodlands of Acacia pendula structural formations (mid, low) and Atriplex nummularia with both species rapidly eliminated by heavy stock grazing which form extensive Tussock Grassland (mid, secondary grasslands. low) Number of IBRA regions 71 Most extensive in IBRA region Mitchell Grass Downs (Qld (Est. and NT) pre-1750 and Present) Estimated pre-1750 extent 570 001 (km2) Present extent (km2) 527 147 Area protected (km2) 31 674 Astrebla spp. (Mitchell grasses) west of Blackall, Qld (Photo: M. Fagg) environment.gov.au Indicative species Environment • The principle plant families represented in tussock • Climate varies from warm tropical with summer grasslands are Poaceae, Asteraceae, Fabaceae, Geraniaceae, maximum rainfall to temperate with winter maximum and Chenopodiaceae. rainfall to alpine climates where snow cover may persist • Species composition varies depending on seasonal for several months. conditions and local variations in soils and topography. • Most grasslands fall within the 400 – 1000 mm mean Grasses tend to dominate after summer rainfall or annual rainfall band, but may occur in wetter and flooding, while forbs generally dominate after winter drier climates. rainfall events. • Most grasslands are found on plains, rolling downs, • At continental scale, tropical and arid environments tend undulating plateaus and local depressions. to be dominated by C4 grass species, while C3 grasses • Soils are typically high in clay content, with become important components of the communities in substrates including alluvium, basalt, siltstones and cooler climates. granitoid geology. • C4 grasses Astrebla (Mitchell grass) and Dichanthium • Many grasslands occupy heavy-textured soils that remain (Bluegrass), dominate grasslands of the tropical and arid wet for extended periods after rain. regions, with Chrysopogon (Ribbon grass) and Eulalia • Along local topographic or edaphic gradients, tussock (Browntop) also common. A wide range of smaller grasslands may transition into temperate woodlands, perennial grasses, including species of Iseilema and tropical savannas, shrublands and wetlands. Aristida, occupy the spaces between the large tussocks. • Grasslands of the tropical and arid regions (e.g. Blue Forbs and native legumes are also common, being more Grass, Mitchell grass etc) generally occur on black, prevalent in southern areas where annual rainfall is more cracking clay soil plains, mostly in tropical and evenly distributed. subtropical latitudes receiving summer maximum • Tussock grasslands of the temperate south-east rainfall (mean 400 – 900 mm per annum), but may are typically dominated by a mixture of C3 and extend to warm temperate latitudes in the arid zone C4 perennial tussock grasses including species of (mean annual rainfall as low as 250 mm) on landforms Austrostipa, Bothriochloa, Chloris, Poa, Rytidosperma such as gilgais or stony plains with heavier clay soils. and Themeda. Poa and Themeda dominate in areas of • Temperate tussock grasslands occur in areas with relatively high rainfall e.g. southern Victoria, New relatively low rainfall (mean 400 – 800 mm per South Wales southern tablelands and Tasmania, year), with semi-arid ecosystems in the New South whereas Chloris, Rytidosperma and Austrostipa Wales Riverina and South Australia at the drier end co-dominate in drier regions including the Riverine of this range. They occur on flat to gently undulating plains and south-central South Australia. Inter-tussock topography on poorly drained clay and clay loam soils of spaces include a variety of forbs including species of relatively high fertility. On the coast they are found on Brachyscome, Burchardia, Chrysocephalum, Cullen, exposed coastal cliffs and headlands and islands. Desmodium, Dianella, Geranium, Ranunculus, Tricoryne Viola, Wahlenbergia and various orchids. On exposed • Other grasslands are found in a range of environments coastal headlands and islands of south-eastern Australia, from Alpine to tropical savannas. Alpine grasslands Themeda triandra, Poa poiformis and Sporobolus virginicus occur on elevated plateaus (mostly above 1700 m are the most common dominants. on the mainland, and above 1000 m in Tasmania) receiving more than 1000 mm mean annual rainfall; • A range of other grasslands not dominated by genera soils are relatively fertile organic loams derived from typical of temperate or Mitchell/Blue grass grasslands, substrates such as granodiorite, dolerite, basalt or are included in this MVG. An important component limestone. Western Australian grasslands experience of this group is Alpine grasslands dominated by genus high temperatures and low irregular rainfall (200 and Poa, with Agrostis, Deyeuxia and Rytidosperma sometimes 350 millimetres per year). The Pilbara grasslands are present, and C4 species are absent. Another example is found along the coastal sand plains while grasslands in the northern Kimberley in Western Australia, where further north in the Kimberley, are found inland on various grasslands of Sorghum, Astrebla, Chrysopogon and flatter lateritic orthent soils. Triodia occur, typically described as savanna. Savanna communities with emergent trees over 0.25% crown cover (scattered isolated trees), are assigned to MVG 12. environment.gov.au Geography through central New South Wales, along the periphery of Blue Grass/Mitchell grasslands in central/northern • Extend from tropical to semi-arid, temperate and Australia, to the northern Kimberley savannas and alpine areas of Australia and include valuable areas for Pilbara Coast. pastoralism (e.g. the Mitchell Grasslands).
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