Volcanic soils are distributed exclusively in regions where active and recent extinct volcanoes are located such as the circum-Pacific orogenic zone and cover about 1% of the land surface of the wo...

中文翻译：

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“火山土壤的性质、功能和使用的新领域”专题章节的前言

火山土仅分布于环太平洋造山带等活火山和近期死火山所在的地区，约占地球陆地面积的1%。