The total soil nitrogen,fixed ammonium and their relationship among the Ust-Sandiic Entisols(Shenmu),Los-Orthic-Entisol(Yan an) and Eum-Orthic Anthrosol(Yangling) on the Loess Plateau were investigated to assess the influences of soil location and depth(0-200 cm) on their contents and to accumulate first-hand data of soil nitrogen accumulation on the Loess Plateau.The results showed that the contents of total soil nitrogen and fixed ammonium differed significantly with location and soil depth.The contents o...
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