论文部分内容阅读
通过人工模拟降雨-径流小区监测的试验方法,设不施肥对照(CK)、基肥穴施(G1)、基肥穴施+追肥面施(G2)、基肥穴施+追肥穴施(G3)4种处理,研究辽宁省浑河流域不同施肥方式下农田氮素随地表径流与壤中流的流失规律,分析不同施肥方式对氮素流失量的影响。结果表明:(1)不同施肥方式下农田地表径流与壤中流产流过程差异显著,地表径流产流时间先于壤中流,同时径流量高于壤中流,是农田主要径流输出方式。G2减少地表径流,G3增大壤中流。(2)地表径流TN平均浓度中G2显著高于其他施肥方式,达到59.00mg/L,其他施肥方式差异较小;壤中流TN平均浓度以G3最高。(3)4种施肥处理,氮素总流失量为385～814mg,各施肥处理的总流失量呈G2>G3>G1>CK,追肥对氮素流失有显著影响。与G2相比,G3在减少地表氮素流失的同时,不会显著增大壤中流氮素流失。
By artificial rainfall-runoff plot monitoring, four treatments (CK, G1, G2, G3) The law of nitrogen loss with surface runoff and soil middle runoff under different fertilization modes in Hunhe River Basin of Liaoning Province was studied and the effects of different fertilization modes on nitrogen loss were analyzed. The results showed that: (1) There was significant difference between surface runoff and soil runoff under different fertilization modes. Surface runoff time was earlier than soil runoff and runoff was higher than soil runoff, which was the main runoff output of farmland. G2 reduces surface runoff and G3 increases soil inflow. (2) The mean concentration of TN in surface runoff was significantly higher than that of other fertilization methods, reaching 59.00mg / L, while the difference of other fertilization modes was less; (3) The total amount of nitrogen loss was 385 ~ 814 mg for the four kinds of fertilization treatments, and the total amount of losses for all fertilization treatments was G2> G3> G1> CK. Top dressing had a significant effect on nitrogen loss. Compared with G2, G3 can not significantly increase the nitrogen loss in the middle stream while reducing the surface nitrogen loss.