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美国土壤系统分类单元 —— 土纲简介 (USDA , 1998). 上述资料引自 : USDA, Keys to Soil Taxonomy, Eighth Edition, 1998. Malcolm E Sumner,《Handbook of Soil Science》, Boca Raton, CRC Press, 2000.
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美国土壤系统分类单元——土纲简介 (USDA,1998)
上述资料引自: • USDA, Keys to Soil Taxonomy, Eighth Edition, 1998. • Malcolm E Sumner,《Handbook of Soil Science》, • Boca Raton, CRC Press, 2000.