[目的]研究不同保墒灌溉措施对冬小麦土壤中NO-N分布的影响.[方法]测定同一灌溉量不同保墒处理和同一保墒处理不同灌溉量条件下冬小麦土壤中NO-N的积累量.[结果]不同保墒处理在灌溉或非灌溉条件下,其NO-N含量基本随着深度的增加而递减;非灌溉和春灌条件下,NO-N累积量大小顺序为PAM>CK>秸秆覆盖>地膜覆盖,而冬灌条件下则PAM处理硝NO-N累积量最小,其他处理差异不大.对于同一处理不同层次NO-N含量大小顺序均为非灌溉>春灌>冬灌.经PAM处理后,土壤淋溶液中全N的累积量均低于对照,随着PAM施用浓度的增加土壤中N淋溶损失量越少.[结论]该研究结果可为下茬作物的施肥提供理论参考.%[ Objective ] The aim was to study the effect of different moisture conserving irrigation measures on distribution of NO3-N in soft of wheat field.[ Method] The accumulation of NO3-N was determined under the same irrigation amount with different moisture conserving treat ments and under the same moisture conserving treatment with different irrigation amounts. [ Result ] Different moisture conserving treatments under the conditions of irrigation or non - irrigation, the NO3-N content declined with the depth' s increasing, under the conditions of non - irrigation and spring irrigation, the accumulation of NO3-N was in the order: PAM ＞ CK ＞ straw mulch ＞ mulching, under the condition of winter irrigation, NO3-N accumulation was minimal of PAM treatment, other treatments were similar. The accumulation of NO3-N was in the order: non -irrigation ＞ spring ＞ winter irrigation under the same treatment on different levels. After PAM treatment, total N accumulation of soil leaching solution volume was significantly lower than control, N leaching loss in the soil was less with the increasing of PAM concentration.[ Conclusion] The result provides some theory reference for fertilization of succeeding crops.
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