澳大利亚干旱半干旱土地面积占７５％，主要分布在西部和中部地区，沙漠面积２６９万平方公里，占国土面积的３５％，属热带沙漠，如大沙漠、吉布森沙漠、维多利亚大沙漠和辛普森沙漠，是世界上受荒漠化影响严重的国家之一。这几大沙漠的植被盖度一般较高，多为固定、半固定沙 Australia arid and semi-arid areas account for 75% of the total area, mainly in the western and central regions, the desert area of ​​2,690,000 square kilometers, accounting for 35% of land area, is a tropical desert, such as the Great Desert, Gibson Desert, Victoria Desert and Simpson Desert, It is one of the countries in the world that is seriously affected by desertification. The cover of vegetation in these large deserts is generally high, mostly fixed and semi-fixed sand