关键词: 宽垄沟灌, 肥液含量, HYDRUS-2D, 硝态氮, 铵态氮, 氮素运移

Abstract: In order to explore the distribution of nitrate and ammonium nitrogen in broad ridge and furrow irrigation and the effect of different fertilizer solution contents on nitrogen content,the nitrogen transport under three different fertilizer solution contents (300,600 and 900 mg/L) was simulated by using the software of HYDRUS-2D,and the distribution of nitrate and ammonium nitrogen under different fertilizer solution contents was analyzed. The results showed that nitrate nitrogen and ammonium nitrogen had the same trend in the infiltration stage under different fertilizer liquid contents.With the increase of fertilizer liquid from 300 mg/L to 900 mg/L,the distribution range of nitrate nitrogen and ammonium nitrogen increased with the process of fertilizer liquid infiltration,and the nitrate nitrogen and ammonium nitrogen content decreased gradually from near to far away from the irrigation ditch;The nitrate nitrogen content tended to be 29.3 mg/kg at the distance of 50—60 cm from the center point D of irrigation ditch,and the ammonium nitrogen content tended to be 7.7 mg/kg at the distance of 20—40 cm from the center point D of irrigation ditch,which indicated that ammonium nitrogen had a faster rate of deceleration with the increase of distance than nitrate nitrogen in the process of migration,and the effect of adsorption on ammonium nitrogen content was more significant; the HYDRUS-2D software had good results in the simulation of nitrogen migration and distribution,which provided a scientific basis for the study of nitrogen migration and reasonable fertilization in wide ridge and furrow irrigation.

Key words: Wide ridge and furrow irrigation, Fertilizer content, HYDRUS-2D, Nitrate nitrogen, Ammonium nitrogen, Nitrogen transport