摘要： 在19年长期定位施肥试验的基础上,研究了施肥后NO₃ ^--N在晋西北土壤中的残留效应,结果表明:单施低量有机肥后,NO₃ ^--N不会在土壤中累积,在土壤剖面的分布呈直线型;其他施肥处理都造成了NO₃ ^--N在土壤中的累积,且呈倒"S"型分布,在20-80,140-200 cm土层出现了2个NO₃ ^--N累积层,在80-140 cm土层形成了NO₃ ^--N累积的低值区域。单施氮肥大幅度提高了NO₃ ^--N的累积量,配施磷肥后,可显著减少NO₃ ^--N在土壤中的累积;配施低量有机肥后,NO₃ ^--N的累积量基本上与单施氮肥处理持平;配施高量有机肥后,加重了NO₃ ^--N在土壤中的累积。

关键词: 长期施肥, 晋西北, 硝态氮

Abstract: Residue of NO ₃ ^- -N in soil by fertilizer application under site -specific fertilization experiment about 19 years in Northwestern Shanxi Province was carried out.Results showned: NO₃ ^--N wasn't accumulate in the soil with low organic fertilizer application, and appear linear type in soil profile distribution."S"typewas appeared of NO₃ ^- -N accumu -lation in soil under other fertilizer treatments.Two NO₃ ^- -N accumulation layer were shown in 20- 80 and 140- 200 cm,and formed NO₃ ^- -N lower accumulation area in 80- 140 cm. Nitrogen fertilizer improved NO₃ ^- -N accumulation on a large scale. However, combined phosphorus fertilization reduced NO₃ ^--N accumulation significantly; accumulation of NO₃ ^--N was about the same as application of nitrogen fertilizer combined with low amount fertilizer; accumulation of NO₃ ^--N in soil rised with application of high amount of organic fertilizer.

Key words: Long -term fertilization, Northwestern Shanxi province, NO₃ ^--N

中图分类号: 

• S147.2