华北集约高产农田温室气体净排放研究初探  

The Preliminary Study of Net Greenhouse Gas Emissions in Intensive High-yielding Cropland in North China

作　　者：梁龙[1] 吴文良[1] 孟凡乔[1] 

机构地区：[1]中国农业大学资源与环境学院,北京100193

出　　处：《中国人口·资源与环境》2010年第S1期47-50,共4页China Population,Resources and Environment

基　　金：国家自然科学基金项目(No.30970533);十一五国家科技支撑项目(No.2006BAD17B05);国际科技合作项目(No.2009DFA91790)资助

摘　　要：本文以华北高产粮区山东桓台冬小麦-夏玉米轮作模式为例,借鉴LCA模型,初步探讨了华北平原通过长期大规模秸秆还田后温室气体排放的汇源问题。结果表明:综合考虑农资系统和农作系统,该模式表现为源,每各生产1 t冬小麦-夏玉米净温室气体排放量为-1 075.71kgCO2e;但具体到农作生产系统,轮作模式下农田生态系统固碳均值为+262.31 kgCO2e,能够抵消因施肥造成的-222.99 kgCO2e排放,并部分抵消机械燃油燃烧排放。因此,农作系统在坚持秸秆还田基础上,进一步改进耕作措施,具有成为温室气体排放汇的可能性。This paper utilized LCA matrix,preliminarily studied the problem that the mode of winter wheat-summer maize rotation was carbon sink or source which undergons long-term and large-scale straw return.The paper takes Huantai county of Shandong Province,a high-yielding grain production in North China Plain as a case.The results indicated the mode was carbon source if we integrated considered agricultural materials production subsystem and farming subsystem and the quantity of net GHGs was-1075.71kgCO_2e when produced 1 ton wheat grain and wheat respectively.But if only thought farming system,the cropland absorbed carbon +262.31 kgCO_2e,which can offset the-222.99 kgCO_2e and partly fuel combustion emission caused by fertilizes used and agricultural machine respectively.Therefore,on the basis of straw return,improving tillage method,farming system may become the carbon sink in the future.

关 键 词：小麦-玉米轮作 温室气体 碳汇 碳源 

分 类 号：X16[环境科学与工程—环境科学]