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以养分回用为目的,在原状土柱模拟试验条件下,采用间歇密闭式抽气法研究了生活污水灌溉对麦秸还田稻田田面水铵态氮浓度、田面水pH以及稻田氨挥发损失的影响.结果表明:1麦秸还田显著增加了田面水NH_4~+-N浓度,生活污水灌溉则显著降低了田面水NH_4~+-N浓度.2正常灌溉施肥秸秆不还田稻田处理的总氨挥发量为58.29 kg·hm-2,占总施氮量的24.29%;麦秸还田显著增加了稻田的氨挥发损失,氨挥发损失量增加了近一倍,达总施氮量的45.66%;而生活污水灌溉显著降低了稻田氨挥发损失量,氨挥发损失量降至总施肥量的17.26%(秸秆不还田)和32.72%(秸秆还田).秸秆还田与生活污水处理具有显著的正交互作用.在3个肥期中,分蘖肥期氨挥发损失率最高,占总氮肥用量的7.38%~24.44%.3无论秸秆还田与否,氨挥发通量与田面水NH_4~+-N浓度之间均存在极显著的正相关关系,与田面水pH值则相关性不显著.麦秸还田增加了稻田氨挥发损失,而麦秸还田与生活污水灌溉耦合能降低稻田氨挥发损失,同时污水中的氮可替代44.41%的化肥氮,减少稻季化肥用量,具有显著的生态环境效益.
With the purpose of nutrient recovery, the effects of domestic sewage irrigation on NH 4 + -N concentration in farmland paddy field, pH value of paddy field water and ammonia volatilization loss in paddy fields were studied by intermittent closed suction method under the condition of undisturbed soil column simulation test. The results showed that: 1 wheat straw returning to field significantly increased the concentration of NH 4 + -N in surface water, while the domestic wastewater irrigation significantly reduced the NH 4 + -N concentration in surface water.2 The total ammonia volatilization The amount of ammonia volatilization increased nearly doubled, reaching 45.66% of the total nitrogen application rate; while the amount of ammonia volatilization increased nearly 40% Sewage irrigation significantly reduced the ammonia volatilization loss in paddy fields, and the ammonia volatilization loss decreased to 17.26% of the total fertilization (straw returning) and 32.72% (straw returning). Straw returning and domestic sewage treatment had significant positive Interaction.Among the 3 fattening stages, the loss rate of ammonia volatilization at tillering stage was the highest, accounting for 7.38% ~ 24.44% of the total nitrogen fertilizer application.3 No matter the straw returning or not, the ammonia volatilization flux and NH 4 + -N concentration There is a significant positive correlation between pH value and surface water is related Significantly, wheat straw returning increased ammonia volatilization in paddy field, but coupling of wheat straw returning to domestic sewage irrigation could reduce ammonia volatilization loss in paddy field, meanwhile, nitrogen in sewage could replace 44.41% Ecological benefits.