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外源硝态氮对典型耕作土壤冻结过程N2O排放的影响

陈 思 张克强 麻晓越 徐宁彤 姚 虎 沈仕洲 王 风

陈 思, 张克强, 麻晓越, 徐宁彤, 姚 虎, 沈仕洲, 王 风. 外源硝态氮对典型耕作土壤冻结过程N2O排放的影响[J]. 环境科学研究, 2014, 27(6): 635-641. doi: 10.13198/j.issn.1001-6929.2014.06.11
引用本文: 陈 思, 张克强, 麻晓越, 徐宁彤, 姚 虎, 沈仕洲, 王 风. 外源硝态氮对典型耕作土壤冻结过程N2O排放的影响[J]. 环境科学研究, 2014, 27(6): 635-641. doi: 10.13198/j.issn.1001-6929.2014.06.11
CHEN Si, ZHANG Ke-qiang, MA Xiao-yue, XU Ning-tong, YAO Hu, SHEN Shi-zhou, WANG Feng. Effects of Nitrate Nitrogen Application on N2O Emissions from Three Types of Soil during Freezing Process[J]. Research of Environmental Sciences, 2014, 27(6): 635-641. doi: 10.13198/j.issn.1001-6929.2014.06.11
Citation: CHEN Si, ZHANG Ke-qiang, MA Xiao-yue, XU Ning-tong, YAO Hu, SHEN Shi-zhou, WANG Feng. Effects of Nitrate Nitrogen Application on N2O Emissions from Three Types of Soil during Freezing Process[J]. Research of Environmental Sciences, 2014, 27(6): 635-641. doi: 10.13198/j.issn.1001-6929.2014.06.11

外源硝态氮对典型耕作土壤冻结过程N2O排放的影响

doi: 10.13198/j.issn.1001-6929.2014.06.11
基金项目: 国家自然科学基金项目(41001043);天津市自然科学基金项目(13JCQNJC08400)

Effects of Nitrate Nitrogen Application on N2O Emissions from Three Types of Soil during Freezing Process

  • 摘要: 为明确外源硝态氮添加对典型耕作土壤冻结过程N2O排放的影响,应用室内冰柜模拟土壤冻结过程,研究在室温-冻结过程中硝态氮添加(0、80、200和500 mg/kg)对3种典型耕作土壤(黑土、潮土和黄土)N2O排放影响的特征. 结果表明:外源硝态氮的添加促进了黑土和潮土的N2O排放,在200 mg/kg硝态氮添加处理下,黑土和潮土的N2O排放通量比CK(对照)分别增加了849%和676%;但在添加高浓度(500 mg/kg)硝态氮时,黑土和潮土的N2O排放通量分别比200 mg/kg处理降低39.3%和21.2%,表现为显著抑制. 随冻结过程的进行,黑土和潮土的N2O排放通量均逐渐降低并接近零排放. 黄土N2O排放通量在室温-冻结过程中变化范围很小,甚至出现负排放. 多因素方差分析结果表明,土壤类型显著影响N2O累计排放量,而土壤pH和C/N是其中重要的影响因子. 根据室内培养试验结果,为减排N2O,建议在深秋整地施肥时期尽量避免在潮土和黑土中施用硝态氮肥. 黄土的N2O排放似乎对外源硝态氮的添加反应不明显,这有待在大田气候-植物-土壤综合条件下进一步验证.

     

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出版历程
  • 收稿日期:  2013-09-26
  • 修回日期:  2014-01-02
  • 刊出日期:  2014-06-25

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