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4 不同种植与施氮方式下土壤固氮作用强度(仁寿大田, 2013) A: 玉米土壤; B: 大豆土壤。缩写同图2。同一生育时期下, 相同种植模式不同氮水平间字母不同表明差异显著(LSD, P < 0.05)。

Fig. 4 Nitrogen-fixing capacities of soil under different N rates and planting patterns (field trial in Renshou, 2013) A: soil of maize strips; B: soil of soybean strips. Abbreviations are the same as those as in Figure 2. At the same growth stage, bars represented by different letters between N levels are significantly different under the same planting pattern (LSD, P < 0.05).