7Mosier A R, Duxbury J M, Frreney J R, et al. Mitigation of Agricultural Emission of Methane[ J]. Climatic Change, 1998, 40 : 39-80.
8West T O, Marland G. A Synthesis of Carbon Sequestration, Carbone Missions, and Net Carbon Flux in Agriculture: Comparing Tillage Practices in the United States [ J ]. Agriculture Ecosystems and Environment, 2002:91.
9Oubey A, Lal R. Carbon Footprint and Sustainability of Agricultural Production Systems in Punjab, India, and Ohio, USA [ J ]. Crop Improvement, 2009.
10Kaya Y. Impact of Carbon Dioxide Emission on GNP Growth: Interpretation of Proposed Scenarios [ R ]. Paris : Presentation to the Energy and Industry Subgroup, Response Strategies Working Group, IPCC, 1989.
