保护性耕作下麦稻轮作水稻田土壤的氮素动态变化
Research on leakage of nitrogen in the rotation field of rice and wheat under the conservation tillage
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摘要: 以翻耕、免耕、秸秆还田3种不同农作处理,探讨保护性耕作措施对淹水稻田土壤中60cm埋深处渗漏液铵态氮(NH+4-N)、硝态氮(NO-3-N)含量动态变化的情况。结果表明:不同耕作处理的水稻田中,硝态氮的流失都大于铵态氮,施肥是引起土壤氮素渗漏的原因之一;免耕结合秸秆覆盖,使硝态氮在土壤中容易迁移下渗。Abstract: The purpose of this experiment was to research the leakage of nitrogen at the 60 cm depth of the rice field under the conservation tillage.The results showed that there was more NO-3-N losing in the rice field than NH+4-N no matter it was tillage,no tillage or straw cover.From a certain angel,no tillage and straw cover played a promotional role for leakage of NO-3-N.
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