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应用生态学报 ›› 1997, Vol. 8 ›› Issue (3): 275-278.

• 研究论文 • 上一篇    下一篇

广州地区晚稻田 CH4和N2O 的排放通量及其影响因素

卢维盛, 张建国, 廖宗文   

  1. 华南农业大学资源环境学院, 广州 510642
  • 收稿日期:1996-11-18 修回日期:1997-04-21 出版日期:1997-05-25 发布日期:1997-05-25
  • 基金资助:

    中国科学院南京土壤研究所土壤圈物质循环开放实验室资助项目

CH4 and N2O fluxes from late-rice fields in Guangzhou region and their affecting factors

Lu Weisheng, Zhang Jianguo, Liao Zongwen   

  1. South China Agricultural University, Guangzhou 510642
  • Received:1996-11-18 Revised:1997-04-21 Online:1997-05-25 Published:1997-05-25

摘要: 用密闭箱法同时研究了广州地区晚稻田CH4和N2O的排放通量。结果表明,连续淹水、常规连作和水旱轮作等3种处理的CH4平均排放通量分别为1.763、2.84和0.36mg·m-2·h-1,而N2O的平均排放通量分别为6.74、11.69和55.07μgN2O-N·m-2·h-1,表明稻田连续淹水显著增加CH4的排放而降低N2O的排放。水旱轮作降低CH4排放而提高N2O的排放,说明稻田CH4和N2O排放之间存在着消长关系。讨论了这2种温室气体排放的影响因素,并初步分析了它们对温室效应的相对贡献。

关键词: 稻田, CH4和N2O排放通量, 水分管理, 水旱轮作, 土壤水分, 时空变化, 黄土塬区, 土地利用方式, 土壤干层

Abstract: CH4 and N2O fluxes from late-rice fileds in Guangzhou region were measured simultaneously by closed chamber method.The results show that the mean CH4 fluxes are respectively 17.63,2.84 and 0.36mg·m-2·h-1 from the treatments of continuous flooding ,routine succession cropping and rice-vegetabele rotation,and the mean N2O fluxes are 6.74,11.69 and 55.07 μg N2O-N·m-2·h-1 correspondingly,which indicates that continuous floodin can greatly increase CH4 emission,while sinnificantly reduce N2O emission.Rice vegetable rotation is the reverse.There exists a trade off between CH4 and N2O emission.The factors affectin CH4 and N2O emssion are discussed,and the contribution of CH4 and N2O to global warming is preliminarily alalysed.

Key words: Rice field, CH4 and N2O fluxes, Water management, Rice-vegetable rotation, spatiotemporal variation, land use type, soil water, soil dry layer, Loess Tableland