ESTIMATE OF METHANE EMISSIONS FROM RICE FIELDS IN CHINA BY CLIMATE-BASED NET PRIMARY PRODUCTIVITY
  • 【摘要】

    Rice fields provide food for over half of the world population but are also an important source of atmospheric CH4. Using the climate-based GIS empirical model and the meteorological data collected fr... 展开>>Rice fields provide food for over half of the world population but are also an important source of atmospheric CH4. Using the climate-based GIS empirical model and the meteorological data collected from 600 meteorological stations in China, with county as the basic unit, the net primary productivity (NPP) of rice fields in China in 1990, 1995, 1998, and 2000 were estimated to be in the range from 202.19×1012g C in 1990 to 163.46×1012g C in 2000. From the measured data of the factors affecting CH4 emission and NPP, the conversion ratio of the NPP into CH4 emission for the rice fields of China was determined to be 1.8%. Using this ratio and estimated NPP, the CH4 emissions from rice fields of China in 1990, 1995, 1998, and 2000 were estimated to be 7.24×1012, 6.31×1012, 6.77×1012 and 5.85×1012g CH4, respectively. 收起<<

  • 【作者】

  • 【作者单位】

    Department of Demography and Economics/Institute of Soil Science/Department of Demography and Economics/Department of Urban and Resources Sciences

  • 【刊期】

    中国地理科学(英文版) SCI 2004年4期

  • 【关键词】

    CH4 emissions  rice fields  net primary productivity  climatic factor 

  • 【基金项目】

    国家重点基础研究发展计划(973计划) Asia-Pacific Network for Global Change Research Nanjing College for Population Programme Management Science Fund