Close-up view of a Acacia aneura tree in theUluru–kata tjuta National Park, Northern Territory, Australia
Acacia aneura, commonly known as mulga or true mulga, is a shrub or small tree native to arid outback areas of Australia, such as the Western Australian mulga shrublands. Mulga trees are highly variable, in form, in height, and in shape of phyllodes and seed pods. It can form dense forests up to 15 metres high, or small, almost heath-like low shrubs spread well apart. Most commonly, it is a tall shrub. Because it is so variable, the taxonomy of the mulga has been studied extensively, and although it is likely to be split into several species eventually, there is as yet no consensus on how or even if this should be done[citation needed]. Although generally small in size, mulga is long-lived, a typical life span for a tree undisturbed by fire is on the order of 200 to 300 years. Mulga has developed extensive adaptations to the Australian desert. Like many Acacia species, it has thick-skinned phyllodes. These are optimised for low water loss, with a high oil content, sunken stomata, and a profusion of tiny hairs to reduce transpiration. During dry periods, a mulga drops much of its foliage to the ground, which provides an extra layer of mulch and from where the nutrients can be recycled. Like most Australian Acacia species, mulga is thornless. The needle-like phyllodes stand erect to avoid as much of the midday sun as possible and capture the cooler morning and evening light. Any rain that falls is channeled down the phyllodes and branches to be collected in the soil immediately next to the trunk, providing the tree with a more than threefold increase in effective rainfall. Mulga roots penetrate far into the soil to find deep moisture. The roots also harbour bacteria that fix atmospheric nitrogen and thus help deal with the very old, nutrient-poor soils in which the species grows. Mulga savanna and mulga codominant tussock grasslands cover roughly 20% of the Australian continent, or about million square kilometres.
Size: 5523px × 3645px
Location: Uluru–kata tjuta National Park, Northern Territory, Australia
Photo credit: © John Gaffen / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: acacia, aneura, angiosperms, area, areas, australia, australian, blue, close-, content, desert, grasslands, high, highly, loss, mulga, national, northern, oil, outback, park, phyllodes, plant, protected, shrub, sky, small, stomata, sunken, territory, tjuta, tree, true, tussock, uluru–kata, variable, water, winter
