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Continental Stress Class is a method of describing the landscape health of biogeographic regions in Australia. There are six Continental Stress Classes with Class 1 containing the most stressed regions and Class 6 the least stressed and therefore most healthy. The classification takes into account indicators of landscape health such as the extent, condition, connectivity, and rate of clearing of native vegetation; changes to soil and hydrological conditions; the presence of feral plants and animals; the presence of threatened species and ecological communities; and threats such as dryland salinity; and fire regime. Continental Stress Classes were first introduced by Gethin Morgan in 2001, in the report ''Landscape Health In Australia: A rapid assessment of the relative condition of Australia's bioregions and subregions''.〔 〕 Morgan gave a class to each of the Interim Biogeographic Regionalisation for Australia (IBRA) subregions, as follows: * Class One: 17 subregions, including the Avon Wheatbelt, the Tasmanian Midlands and numerous subregions in south eastern Australia, including most of Victoria; * Class Two: 20 subregions; * Class Three: 90 subregions; * Class Four: 75 subregions; * Classes Five and Six: 152 subregions. The classification is now used by a range of federal and state government agencies in Australia. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Continental Stress Class」の詳細全文を読む スポンサード リンク
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