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《世界干旱带分布图》
desert.
World Map of Aridity Zone
(联合国环境规划署为评价1990年的全球土地荒漠化现状,于1991年编制。该图以1951〜1980年的气象资料为基础,根据降水量与可能蒸散的比值,把全球划分为:极端干旱带(干燥度<0.05);干旱带(0・05〜 0.20);半干旱带(0.21〜0.50);干亚湿润带(0.51〜0.65);湿亚湿润带和湿润带(> 0.65))
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