基于生命周期法的中国2004—2015年油菜生产氮足迹分析
陈中督,徐春春,纪龙,方福平

Assessment of the nitrogen footprint in oilseed rape production of China during 2004 to 2015 base on life cycle assessment method
Zhong-Du CHEN,Chun-Chun XU,Long JI,Fu-Ping FANG
图1 活性氮排放计算边界
Fig. 1 System boundary for calculating greenhouse gas (GHG) emissions