【摘要】 以甘肃省河西走廊灌区为试验地点,分别在0、150、300kg/hm2氮水平和816、1632m3/hm2灌水量下,对3次灌水前、后大麦/玉米带田0～200cm土壤NO-3-N含量变化和灌水后135cm处渗漏液NO-3-N浓度进行了测定。结果表明:灌水明显影响土壤硝态氮累积量,随灌水次数增加,土壤硝态氮累积量降低,而且在高灌水条件下土壤硝态氮累积量变化比低灌水量时大。从渗漏液硝态氮浓度来看,大麦带和玉米带都是以第1次灌水最高,浓度分别为8.04～17.21和3.30～14.57mg/L。3次灌水土壤硝态氮淋失量,玉米带以N150kg/hm2和灌水量1632m3/hm2最高,平均为4.31kg/hm2;大麦带以N150kg/hm2及灌水量1632m3/hm2和N150kg/hm2及灌水量816m3/hm2比较高,平均为6.82kg/hm2。更多还原

【Abstract】 Before and after each irrigation, NO^-₃-N concentration in 0²00 cm soil and 135 cm deep leachate of maize/barley intercropping was determined in Hexi corridor of Gansu Province, with three rates of nitrogen application（0, 150, 300 kg/hm²）, two rates of irrigation level （816, 1632 m³/hm²）. The results showed that irrigation obviously affected soil NO^-₃-N accumulation, and it reduced with the increase of irrigation times. In comparison with lower irrigation level, high rate irrigation accelerated NO^-₃-N reduction. NO^-_-N concentrations in leachate from both barley and maize strip at first irrigation were the highest, they reached 8.04¹7.21 mg/L and （3.30¹4.57） mg/L, respectively. After three times irrigations, NO^-₃-N leachate in maize strip was the highest with the treatment that the level of N fertilizer application was 150 kg/hm² and irrigation quantity was 1632 m³/hm², with average content reaching 4.31 kg/hm². NO^-₃-N leachates in barley strip were higher with treatment that the level of N fertilizer application was 150 kg/hm² and irrigation quantity was 1632 m³/hm² and treatment that the level of N fertilizer application was 150 kg/hm² and irrgation quantity was 816 m³/hm², respectively, with average content reaching 6.82 kg/hm².更多还原