不同类型水稻土氮素组成及含量分布特征

研究川中丘陵地区不同类型水稻土氮素组成及含量分布特征，探讨土壤氮素与有机质含量间的相关关系。结果表明，研究区土壤氮素含量总体水平较低，全氮、碱解氮含量分别为（1.08±0.26）g/kg、（33.06±8.07）mg/kg，氨基酸态氮、氨态氮、氨基糖态氮的含量分别为（30.39±15.08）mg/kg、（96.06±13.01）mg/kg、（16.77±11.30）mg/kg；不同类型水稻土全氮、碱解氮与有机氮含量分布特征均为潜育型>渗育型>淹育型；不同类型水稻土中有机氮组分变化为氨态氮>氨基酸态氮>氨基糖态氮；不同类型水稻土全氮与有机质含量存在极显著正相关关系(P<0.01)。

Composition and Distribution Characteristics of Nitrogen In Different Paddy Soil

The composition and distribution characteristics of nitrogen from different paddy soil in the hilly area of the middle Sichuan basin was studied,and the correlation between nitrogen and organic was discussed.The results showed that the level of soil nitrogen content was still low,the content of soil total nitrogen （TN） and available nitrogen （AN） were （1.08 ± 0.26） g/kg and （33.06 ± 8.07） mg/kg,the content of ammonium nitrogen,ammonium nitrogen and amino sugar nitrogen were （30.39 ± 15.08） mg/kg,（96.06 ± 13.01） mg/kg and （16.77 ± 11.30） mg/kg.The content of total nitrogen （TN）,available nitrogen （AN） and organic nitrogen in different paddy soil was in the order of gleyed paddy soil percogenic paddy soil submergic paddy soil.The components of organic nitrogen in different paddy soil was ammonium nitrogen ammonium nitrogen amino sugar nitrogen.Moreover,soil total nitrogen was significantly correlated with soil organic matter （P0.1）.