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通过2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磷素和钾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磷素和钾素供应水平。小麦生长期间,玉米秸秆直接还田后磷素的转化表现为前期净释放、中期净固持、后期净释放;钾素的转化则表现为前期大量释放,中、后期释放量逐次减少。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,其转化对土壤磷素和钾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。
Through two-year field experiment, the effect of corn stalks returning to the field on the spatio-temporal dynamics of phosphorus and potassium in soil was studied. The results showed that the return of maize straw directly to the soil can significantly increase the supply of phosphorus and potassium. During the growth of wheat, the transformation of maize straw directly into the field after the performance of the early net release of net release, the net net holding the net, the late net release; K conversion was the performance of a large number of early release, the late release gradually reduced. In the regulation of straw C / N15: 1 ~ 35: 1, it was not obvious that the effects of different transformations on the spatio-temporal dynamics of soil P and K did not change after the different C / N ratios of straw were changed. In the regulation of straw C / N under the premise of the application of preservatives, the transformation process of straw after returning significantly accelerated.