The soil total nitrogen,soil microbial biomass nitrogen and their relationship of three types of soils on the Loess Plateau(Ust-Sandiic Entisols at Shenmu,Los-Orthic-Entisol at Yan an and Eum-Orthic Anthrosol at Yangling) were investigated to determine how they were affected by location and soil depth(0200 cm) on the Loess Plateau.The results showed that the contents of soil total nitrogen and microbial biomass nitrogen were significantly different in different situations and soil depth.From south to north ...
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