陕西渭北苹果园土壤NO_3^-—N累积的影响因素研究

Effect of different factors on NO_3^-—N accumulation in apple orchards in Weibei area,Shaanxi province

为进一步研究果园土壤硝态氮的累积及分布情况,在陕西渭北主要苹果产区分别采集了0～120cm土壤剖面样品,测定了土壤硝态氮含量,分析了不同因素对果园土壤硝态氮累积的影响。结果表明,氮肥的大量施用会造成硝态氮在土壤中的累积,而配施有机肥、地表生草、合理的种植密度均可减少硝态氮的累积量。灌溉可加速硝态氮向地下的淋洗。研究为采取有效措施控制和减少果园土壤中的硝态氮累积量提供了理论依据。

Experiment was carried out in the apple orchards located in Weibei area, the concentrated apple producing area of Shaanxi province for studying the NO3^--N accumulation and distribution in the soil. Layers from 0 to 120 cm and the effects of different factors on NO3^--N accumulation .The results showed the more nitrogen fertilizers applied, the more NO3^--N accumulated in different soil layer; nitrogen fertilizers applied with organic fertilizer or sod culture could reduce the accumulation of NO3^--N. The accumulation of NO3^--N in high-density orchards was more than that in less density and good light distribution orchards. Irrigation accelerated the leaching of NO3^--N.