不同促腐条件下秸秆直接还田对土壤养分时空动态变化的影响

Effect of Different Treatments on the Space-time Dynamic Changes of Soil Nutrients by Returning Maize Straw under Different Decay Conditions

通过两年田间定位试验,研究了冀东地区玉米秸秆连续直接还田对土壤氮素和磷素养分时空动态变化的影响.结果表明,玉米秸秆直接还田可明显提高土壤氮素和磷素供应水平.在调节秸秆C/N15∶1～35∶1范围内,调节秸秆不同C/N未改变秸秆还田后的转化进程,其转化对土壤氮素和磷素时空动态变化的影响亦无明显差异.在调节秸秆C/N的前提下配施促腐剂,使秸秆还田后的转化进程明显加快.

A 2 years experiment was conducted in cinnamon soil in the eastern parts of Hebei province. The effect of different treatments on the space-time dynamic changes of soil N and P by returning application of maize straw under different decay conditions was studied. The results showed that returning application of maize straw could significantly improve the supply of soil N and P. Adjusting the proportion of straw C/N from 15∶1 to 35∶1,the course of transformation with application of maize straw did not change, and there was no obvious difference to the space-time dynamic variations of soil N and P. Adjusting the proportion of straw C/N with effective microorganisms could remarkably quicken the step of transformation of maize straw.