Li Hu, Wang Li-Gang, Qiu Jian-Jun
Institute of Natural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China.
Ying Yong Sheng Tai Xue Bao. 2007 Sep;18(9):1994-2000.
Taking Hebei Province in Huang-Huai-Hai Plain as a study case, the DNDC model was tested with field observation data, and used to estimate the farmlands CO2 and N2O emissions. The results showed that the simulated results could better reflect the characters of soil CO2 and N2O emissions, and the total CO2 and N2O emissions from the farmland soils in 111 counties of Hebei Province in 2003 were estimated to be 3.758 x 10(6) t C and 40.345 x 10(6) kg N, respectively. Winter wheat/ summer maize rotation fields contributed about 40% of the CO2 and N2O emissions, and thus, the mitigation of farmland soil CO2 and N2O emissions should be focused on the high CO2 and N2O emission counties, especially on the winter wheat/summer maize rotation fields in these regions. It could be unnecessary or non-effective to mitigate the CO2 and N2O emissions at large scale.
以黄淮海平原的河北省为例，利用田间观测数据对DNDC模型进行了检验，并用于估算农田二氧化碳和氧化亚氮排放量。结果表明，模拟结果能较好地反映土壤二氧化碳和氧化亚氮排放特征，2003年河北省111个县农田土壤二氧化碳和氧化亚氮排放总量分别估算为3.758×10⁶ t C和40.345×10⁶ kg N。冬小麦/夏玉米轮作田贡献了约40%的二氧化碳和氧化亚氮排放，因此，农田土壤二氧化碳和氧化亚氮减排应重点关注高排放县，特别是这些地区的冬小麦/夏玉米轮作田。大规模减排二氧化碳和氧化亚氮可能没有必要或效果不佳。
