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  • 标题:Optimizing grain yields reduces CH4 emissions from rice paddy fields
  • 本地全文:下载
  • 作者:H. A. C. Denier van der Gon ; M. J. Kropff ; N. van Breemen
  • 期刊名称:Proceedings of the National Academy of Sciences
  • 印刷版ISSN:0027-8424
  • 电子版ISSN:1091-6490
  • 出版年度:2002
  • 卷号:99
  • 期号:19
  • 页码:12021-12024
  • DOI:10.1073/pnas.192276599
  • 语种:English
  • 出版社:The National Academy of Sciences of the United States of America
  • 摘要:Microbial production in anoxic wetland rice soils is a major source of atmospheric CH4, the most important non-CO2 greenhouse gas. Much higher CH4 emissions from well managed irrigated rice fields in the wet than in the dry season could not be explained by seasonal differences in temperature. We hypothesized that high CH4 emissions in the wet season are caused by low grain to biomass ratios. In a screenhouse experiment, removing spikelets to reduce the plants' capacity to store photosynthetically fixed C in grains increased CH4 emissions, presumably via extra C inputs to the soil. Unfavorable conditions for spikelet formation in the wet season may similarly explain high methane emissions. The observed relationship between reduced grain filling and CH4 emission provides opportunities to mitigate CH4 emissions by optimizing rice productivity.
  • 关键词:greenhouse gas ; C allocation in rice plants ; rice production ; global warming
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