Mineral N accumulation and distri bution of apple orchard soil on the Weibei dryland
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DOI：10.7606/j.issn.1000-7601.2008.03.32
Key Words: Weibei dryland  apple orchard  mineral N  accumulation and distribution
Author NameAffiliation
RAN Wei College of Resources and Environment Northwest A ＆ F University, Yangling， Shanxi 712100，China 
XIE Yongsheng Institute of Soil and Water Conservation Chinese Academy of Sciences and the Ministry of Water Resources, Yangling, Shanxi 712100,China；Xi’an University of Technology， Xi’an， Shaanxi 710048，China 
HAO Mingde Institute of Soil and Water Conservation Chinese Academy of Sciences and the Ministry of Water Resources, Yangling, Shanxi 712100,China 
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Abstract:
      The content of NO3-N and NH+4-N was deter mined in the soil profile of 6to 37 age apple orchard on the Weibei dryland. The results showed that the content and distribution of NH+4-N maintain relatively stablein the depths of 0～400 cm soil profile with different planting years. The content and distribution of nitrate nitrogen varied significantly and the content of nitrate nitrogen was 0．31～195．32mg／kg ．The accumulation of nitrate nitrogenincreased significantly which was locatedin 40～260cm depths and the maximum nitrate N content was 195．32mg／kg in 100～120 cm depths of 15 age orchard．Large accumulation of nitrate N in the soil profile might lead to potential environmental pollution．
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