中国农业气象 ›› 2014, Vol. 35 ›› Issue (06): 628-634.doi: 10.3969/j.issn.1000-6362.2014.06.004

• 论文 • 上一篇    下一篇

长期秸秆还田对设施菜田土壤反硝化特征和N2O排放的影响

宋贺,王成雨,陈清,曹文超,王敬国   

  1. 1安徽农业大学农学院,合肥230036;2中国农业大学资源与环境学院,北京100193
  • 收稿日期:2014-04-20 出版日期:2014-12-20 发布日期:2015-05-21
  • 作者简介:宋贺(1982-),安徽萧县人,博士生,主要从事土壤碳氮元素循环研究。Email:songhesonghe@foxmail.com
  • 基金资助:
    国家自然科学基金(41301258;41230856);安徽省自然科学基金(1408085QC68);安徽农业大学青年科学基金重点项目(2013ZD031)

Effects of Longterm Amendment of Residue on Denitrification Characteristics and N2O Emissions in Greenhouse Soil

SONG He,WANG Cheng Yu,CHEN Qing,CAO Wen chao,WANG Jing guo   

  1. 1College of Agronomy,Anhui Agricultural University,Hefei230036,China;2College of Resources and Environmental Sciences,China Agricultural University,Beijing100193
  • Received:2014-04-20 Online:2014-12-20 Published:2015-05-21

摘要: 基于2004年2月-2010年9月温室菜田长期定位试验,通过室内培养和田间同步,利用静态箱法和硅胶管法分别检测土壤表层N2O通量和剖面N2O浓度的变化,以研究高碳氮比的小麦秸秆施用对设施菜田土壤反硝化过程及N2O排放的影响。结果表明,(1)与对照处理(CK)相比,添加秸秆处理(ST)显著提高0-20cm土层土壤反硝化量,促进N2O还原,增加N2产生量,显著降低追肥灌溉后表层土壤N2O的排放峰值和土壤底层50cm处N2O浓度峰值,但对20-80cm土层土壤的反硝化特征影响较少。(2)秸秆还田有利于降低设施菜田NO-3淋洗风险,秸秆的深施是进一步降低菜田NO-3淋洗的有效途径,有利于土壤底层N2O的再次还原。因此,设施菜田中添加小麦秸秆并深施有利于降低N2O排放和减少NO-3的淋洗。

关键词: 痕量气体, 氮素损失, 日光温室, 碳氮比

Abstract: Based on a long term greenhouse experiment(Feb.2004-Sep.2010),the objective of the present study was to find out the effects of wheat residue(high C/N)amendment on denitrification process and N2O emissions in greenhouse soil,by carrying out simultaneous laboratory and field studies,which used methods of static blackchamber and silicone tube in situ to monitor N2O emissions and N2O concentrations in soil profile,respectively.The results showed that,firstly,compared to the control(CK),strawamended treatment(ST)significantly enhanced the denitrification rates and the production of N2 in 0-20cm soil layer,promoted N2O reduction and reduced N2O emissions and N2O concentrations at the depths of 50cm,but had no impact on denitrification characteristics in 20-80cm soil layers.Secondly,residue amendments could reduce the risk of NO-3 leaching in greenhouses.Residue incorporated into deeper soil layers may be a possible effective way to further reduce the risk of NO-3 leaching and to promote followed N2O reduction.Therefore,deep application of wheat residue could decrease N2O emission and NO-3 leaching in greenhouses.

Key words: Trace gases, Nitrogen loss, Solar greenhouse, C/N ratio