添加无机氮磷与有机肥对土壤有机氮矿化的影响

Effects of adding chemical nitrogen and phosphorus on mineralization of soil organic nitrogen.

摘要: 研究分析黄土高原农家厩肥(有机肥)矿化量曲线表明，有机肥中有机氮对土壤供N能力仅在施用初期有一定效果，但其对土壤有效氮的贡献并不大。加入无机氮磷和有机肥后如除去带入的有效氮素，对土壤原有的有机氮分解无促进作用，且矿化量还有一定程度的减少。加入N、P肥后，仅粮草3年轮作处理矿化量有所增加，为+6.3%；其余裸地、玉米连作、粮饲豆4年轮作矿化量均减少，其减幅分别为35.3%、34.8%和44.6%。加入有机肥后，除有机肥84d矿化量外，仅裸地处理矿化量有所增加(171.6%)，其余处理矿化量均减少。

Abstract: The mineral curves of manure on the Loess Plateau are analyzed. It is shown that there are some effects on the initial stages of application of organic-N in manure, but the effects are not too great. There is no boosted action to the decomposition of organic-N after adding chemical N, P, and manure, and also the amount of mineralization is decreased. Adding N and P,the amount of mineralization of 3-years forage rotation of crop-grass is raised +6.3%, and others reduced. Adding manure, the amount of mineralization is reduced except bareness disposal (+171.6%).