长期定位施肥对无石灰性潮土0~100cm土层NO_3^--N动态变化的影响

Effects of Long-term Located Fertilization on Dynamic Changes of NO_3^--N in 0～100 cm Layer of the Non-calcareous Fluro-aquic Soil

在无石灰性潮土26年的定位试验进行过程中,在12个不同处理CK、N1、N2、M1、M1N1、M1N2、M2、M2N1、M2N2、NP2K、N2P和N2K中,于2003研究了长期定位施肥对非石灰性潮土0~100 cm土层NO3--N动态变化的影响,结果表明,长期单施有机肥及其配施无机氮肥,氮磷钾或氮磷以适当比例配施,可减少土体中NO3--N的积累。单施氮肥以及氮钾配施的土壤剖面中NO3--N积累增加,对土壤环境和地下水构成潜在污染。降水、灌溉、氮肥用量及作物吸收利用是影响土壤NO3--N淋洗、积累的主要因素。

This experiment was done in the 26 years fixed position experiment of non-calcareous fluro-aquic soil during the year of 2003,12 treatments were designed ：CK ,N1 ,N2 ,M1 ,M1N1 ,M1N2 ,M2 ,M2N1 ,M2N2 ,NP2K ,N2P and N2K. The effects of long-term located fertilization on dynamic changes of NO3^--N in 0-100 cm layer of the non-calcareous fluro-aquic soll were studied. The results indicated that：it can reduce the accumulation of NO3^--N in the soil by the application of organic fertilizer,combined inorganic nitrogen fertilizer ,combined application N,P,K fertilizer and N,P fertilizer at the proper ratio. It can enhance the content of NO3^--N of soil profile in the soil of the application of nitrogen fertilizer only and combined N fertilizer and K fertilizer,so it can pollute the soil environment and groundwater. Precipitation,irrigation, dosage of nitrogen fertilizer and the utilize of crop absorption were the factors which can have effect on the accumulation and leaching of soil NO3^--N.