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应用生态学报 ›› 2002, Vol. ›› Issue (1): 67-70.

• 研究论文 • 上一篇    下一篇

降雨和土壤湿度对贵州旱田土壤N2O释放的影响

徐文彬, 刘广深, 刘维屏   

  1. 浙江大学环境科学研究所, 杭州 310027
  • 收稿日期:1999-12-13 修回日期:2000-04-25 出版日期:2002-01-15
  • 通讯作者: 刘维屏
  • 基金资助:
    国家自然科学基金资助项目(49873034;40073034)

Effects of precipitation and soil moisture on N2O emissions from upland soils in Guizhou

XU Wenbin, LIU Guangshen, LIU Weibing   

  1. Institute of Environmental Science, Zhejiang University, Hangzhou 310027
  • Received:1999-12-13 Revised:2000-04-25 Online:2002-01-15

摘要: 以南方亚热带代表性旱田土壤贵州玉米油菜轮作田、大豆冬小麦轮作田和休耕地为观测对象,研究土壤N2O释放通量季节变化与降雨和土壤湿度的关系.同时,采用DNDC模型定量探讨了未来降雨量变化对土壤N2O释放的潜在影响.结果表明,降雨与N2O释放峰间存在明显的驱动响应关系,N2O释放通量与降雨量和土壤湿度间存在正相关性.模型检验结果表明,夏秋季土壤N2O释放通量与降雨量变化呈正相关,而降雨量的大幅度增加或下降将引起冬春季土壤N2O释放通量的微弱下降.

Abstract: Soils of corn-rape seed rotation,soybean-winter wheat rotation and fallow land in Guizhou were representatively selected to study effects of precipitation and soil moisture on N2O emissions.Furthermore,DNDC model was used to assess the potential effects of variations in precipitation in future on N2O emissions from above lands.The results indicated that N2O emission pulses were obviously driven by rainfall and N2O fluxes were correlated positively with precipitation and soil moisture.The results from DNDCmodeling showed that N2O fluxes from soils in summer and autumn would be correlated positively with precipitation,but N2O fluxes in winter and spring would slightly decrease with great change of precipitation.

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