氮肥在肥际微域中矿化与迁移的模拟研究

Mineralization and Migration of Nitrogen in Fertilizer Microsites

为给氮肥的科学施用和高效利用提供科学依据,采用PVC管培养法,对氮肥在肥际微域中的矿化与迁移进行了探索性研究。结果表明,不同施肥处理的硝态氮含量分布差异显著,不同处理硝态氮含量依次为施化肥处理>施秸秆处理>不施肥处理;培养前期(5 d、10 d)铵态氮含量分布差异显著,但培养后期(20 d、40 d)差异不显著。生产实践中保持一定量的有机肥投入,以降低硝化作用、减少氮素损失和环境污染具有重要的参考意义。

The mineralization and migration of nitrogen in fertilizer microsites were studied by using PVC tube culture method to provide the scientific basis for rational application and efficiency utilization of nitrogen fertilizer.The results showed that there was significant difference in distribution of nitrate nitrogen content between different nitrogen application treatments,the nitrate nitrogen content of different nitrogen application treatments was applying ureaapplying wheat strawCK,there was significant difference in distribution of ammonium nitrogen content between different nitrogen application treatments at earlier stage（5 d and 10 d） and there was no significant difference in distribution of ammonium nitrogen content between different nitrogen application treatments at later stage（20 d and 40 d）.Applying a specified organic nitrogen can reduce nitrification,decrease nitrogen loss and environmental contamination in production practice.