| 氮肥水平对不同土壤N2O排放的影响 |
| 摘要点击 2246 全文点击 1498 修订日期：2007-09-18 |
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| 中文关键词 N2O排放 氮肥； 稻麦轮作； 盆栽试验 |
| 英文关键词 N2O emission N fertilizer rice-wheat rotation period pot experiment |
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| 中文摘要 |
| 鉴于N2O排放量占施用氮肥量的比例即N2O排放系数还有很大不确定性，室外盆栽试验于2002～2003年选取3个供试土壤，各土壤设置对照和低、中、高氮肥水平，全年施尿素量 (以N计) 分别为334、 670和1 004 kg/hm2.结果表明，水稻生长季，各个土壤的N2O累积排放量与其对照相比的增加量在低、中、高氮肥水平间无明显差异；而小麦生长季，随氮肥施用量增加，各个土壤的N2O累积排放量与其对照相比的增加量在3种氮肥水平之间的差异显著.整个稻麦轮作系统，随氮肥用量的增加明显促进麦田N2O的排放.无论水稻或小麦生长季，对照3个土壤的N2O累积排放量并无显著差异，F土壤（江苏溧水）、G土壤（江苏涟水）和H土壤（江苏农科院）的N2O累积排放量，在水稻生长季分别为168、 127和146 mg/m2；小麦生长季，分别为134、 124和168 mg/m2.在施氮肥后，3个土壤的N2O排放量出现差异，如在中氮水平下，小麦生长季，F土壤、G土壤和H土壤N2O累积排放量分别为976、 744和626 mg/m2.稻麦轮作生长季内，在低氮与中氮2个水平下，不同土壤间N2O排放系数存在显著差异.以1个稻麦轮作周期为时间尺度，F土壤、G土壤和H土壤总的N2O排放系数分别为1.1%±0.23%、 0.75%±0.17%和1.01%±0.11%，表明不同土壤对N2O排放系数的影响不同. |
| 英文摘要 |
| To investigate the effect of different urea incorporation amount in different soils on N2O emission, a pot experiment was carried in 2002-2003.Four treatments were designed as the control (without urea incorporation); low N fertilizer level（334 kg/hm2）; middle N fertilizer level（670 kg/hm2）; high N fertilizer level (1 004 kg/hm2). In rice growing season, compared to control, the increment of N2O emission accumulation flux of each soil has no obviously differences among three N fertilizer levels. Contrarily, in wheat-planted soils, there are remarkably differences among three N fertilizer levels. Without urea incorporation, there are no differences among N2O accumulation emission flux of three soils. During the rice growing season, N2O accumulation emission flux of F soil (jiangsu province, lishui), G soil (jiangsu province, lianshui) and H soil (jiangsu province, agriculture academy) are 168, 127 and 146 mg/m2,respectively. N2O accumulation emission flux of F soil, G soil and H soil is 134, 124 and 168 mg/m2, respectively, during wheat growing season. Incorporation of urea into different soils yielded different influence on N2O emission. For example, at middle-N fertilizer, N2O accumulation emission flux from F soil, G soil and H soil is 976, 744 and 626 mg/m2,respectively. During rice-wheat rotation period, significance differences exists among N2O emission factors of three soils, with the value of (1.1±0.23)%, (0.75±0.17%) and (1.01±0.11)%. Furthermore, under the high N fertilizer level, N2O emission factors of three soils had no significantly difference（p=0.3）; while, the N2O emission factors existed difference among three soils under the low and middle N fertilizer level（F=6.25，p=0.01）. |
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