中国农业科学 ›› 2004, Vol. 37 ›› Issue (10): 1492-1496 .

• 土壤肥料.节水灌溉 • 上一篇    下一篇

冬小麦-夏玉米轮作条件下氮素反硝化损失研究

邹国元,张福锁,巨晓棠,陈新平,刘学军   

  1. 北京市农林科学院植物营养与资源研究所
  • 收稿日期:2004-02-11 修回日期:1900-01-01 出版日期:2004-10-20 发布日期:2004-10-20
  • 通讯作者: 邹国元

Study on Soil Denitrification in Winter Wheat-Summer Maize Rotation System

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  1. 北京市农林科学院植物营养与资源研究所
  • Received:2004-02-11 Revised:1900-01-01 Online:2004-10-20 Published:2004-10-20

摘要: 在北京潮土上研究了冬小麦-夏玉米轮作体系下土壤氮素反硝化损失。结果表明,不同氮肥用量处理,土壤氮素反硝化损失量为4.71~9.67 kg·ha-1。夏玉米生育期是反硝化损失的关键时期。氮肥施用后的1~2周是氮素反硝化损失的最剧烈阶段。土壤N2O的生成、排放与反硝化作用有相似的规律性,N2O可能大部分来自于硝化作用。

关键词: 潮土, 冬小麦, 夏玉米, 反硝化, N2O

Abstract: Soil denitrification was studied in winter wheat-summer maize rotation cropping system with an aquic cambisol. Results showed that the N loss amount by denitrification ranged from 4.7 to 9.7 kg·ha-1 with different rates of fertilizer nitrogen. The key stage of denitification was during summer maize-growth-period, especially within 1-2 weeks after fertilizer nitrogen was applied. Similar trend was found between soil N2O production/emission dynamic and denitrification dynamic in the rotation system. This may indicate that N2O mainly produced in nitrification process.

Key words: Aquic cambisol, Winter wheat, Summer maize, Denitrification, N2O