中文摘要：

以位于西南大学试验农场的紫色土长期免耕试验田为研究对象,探讨了不同耕作方式-冬水田平作（DP）、水旱轮作（SH）、垄作免耕（LM）、厢作免耕（XM）和垄作翻耕（LF）对紫色水稻土全氮及碱解氮的影响。结果表明,在0～60 cm的土壤深度内,不同耕作方式下土壤全氮的含量为LM（1.53 g/kg）〉DP（1.50 g/kg）〉XM（1.32 g/kg）〉LF（1.31 g/kg）〉SH（1.16 g/kg）,碱解氮为DP（111.48 mg/kg）〉LM（105.20 mg/kg）〉SH（101.97 mg/kg）〉LF（97.26 mg/kg）〉XM（95.19 mg/kg）,长期垄作免耕有利于土壤中全氮的提高。不同耕作处理下土壤C/N在7.96～16.56之间,免耕农作更有利于有机质矿化过程中养分的释放。

英文摘要：

Soil total nitrogen and alkali-hydrolyzed nitrogen based on a long-term experiment with various tillage systems were studied in a purple paddy soil at the farm of Southwest University,Chongqing,China.The experiment included five tillage treatments： conventional tillage with rice only system（DP）,conventional tillage with rotation of rice and rape system（SH）,no-till and ridge culture with rotation of rice and rape system（LM）,no-till and plain culture with rotation of rice and rape system（XM）,and tillage and ridge culture with rotation of rice and rape system（LF）.The content of soil total nitrogen in the 0-60 cm soil layers under different tillage systems was LM（1.53 g/kg）DP（1.50 g/kg）XM（1.32 g/kg）LF（1.31 g/kg）SH（1.16 g/kg）,the content of alkali-hydrolyzed nitrogen was DP（111.48 mg/kg）LM（105.20 mg/kg）SH（101.97 mg/kg）LF（97.26 mg/kg）XM（95.19 mg/kg）.Long-term LM treatment significantly increased soil total nitrogen content.The C/N ratio was LM（14.94）XM（10.49）SH（10.38）LF（10.20）DP（10.18） which indicated that an easier nutrients release to soil during the process of organic matter decomposition under no-till systems.