减量施氮对玉米-大豆套作系统土壤氮素氨化、硝化及固氮作用的影响

雍太文,陈平,刘小明,周丽,宋春,王小春,杨峰,刘卫国,杨文钰

Effects of Reduced Nitrogen on Soil Ammonification, Nitrification, and Nitrogen Fixation in Maize-soybean Relay Intercropping Systems

Tai-Wen YONG,Ping CHEN,Xiao-Ming LIU,Li ZHOU,Chun SONG,Xiao-Chun WANG,Feng YANG,Wei-Guo LIU,Wen-Yu YANG

图7 不同种植模式和施氮量下土壤N2O排放特征(仁寿大田, 2013) A: N2O排放量; B: N2O损失率。MM: 玉米单作; MS: 大豆单作; IMS: 玉米-大豆套作。NN: 不施氮; RN: 减量施氮; CN: 常规施氮。同一种植模式下不同字母标记表明不同氮水平处理间差异显著(LSD, P < 0.05)。

Fig. 7 Characteristics of N2O emission under different planting pattern and N application rates (field trial in Renshou, 2013) A: N2O emissions; B: the loss rate of N2O. MM: monoculture maize; MS: monoculture soybean; IMS: maize-soybean relay intercropping. NN: no N; RN: reduced N; CN: conventional N. Bars represented by different letter are significantly different between N levels under the same planting pattern (LSD, P < 0.05).