...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Production, oxidation, and emissions of methane from rice fields in China
【24h】

Production, oxidation, and emissions of methane from rice fields in China

机译：中国稻田甲烷的生产，氧化和排放

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Detailed field studies of methane emissions from rice fields show that when nitrogen fertilizers are used with intermittent irrigation the seasonal average flux is about 3 mg/m2/hr. When continuous flooding and organic material is added to the same fields, the emissions rise to nearly 30 mg/m2/hr. Production rates measured during the two years when both organic material and water were applied to these fields were found to be 60 and 90 mg/m2/hr in consecutive years. The fraction oxidized is calculated to be about 80% one year and 43% the next year. The results suggest that high organic fertilizer increases production, but may affect the emissions more by reducing oxidation. The data show that seasonally averaged emissions vary by up to factor of 2 among adjacent fields but the variability of production is only about 20%. Information obtained from the farmers suggests that there is a trend towards less use of organic manure as nitrogen fertilizers have become available and the occurrence of intermittent flooding has increased for various reasons. These conditions have likely led to decreasing emissions of methane from rice fields in China in the recent decades.
机译：稻田甲烷排放的详细田间研究表明，当氮肥间歇灌溉时，季节平均通量约为3 mg / m2 / hr。当在同一区域连续注水和添加有机物时，排放量将增加到近30 mg / m2 / hr。在连续两年中，将有机材料和水应用于这些田地的两年期间测得的生产率分别为60和90 mg / m2 / hr。计算出氧化的分数一年约为80％，次年约为43％。结果表明，高有机肥可提高产量，但可能通过减少氧化作用而对排放量产生更大的影响。数据显示，季节性平均排放量在相邻田间的差异最大为2，但生产的变异性仅为20％。从农民那里获得的信息表明，随着氮肥的普及，有机肥料的使用量有减少的趋势，由于各种原因，间歇性洪水的发生也有所增加。这些条件可能导致近几十年来中国稻田甲烷排放量的减少。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号