| 氮肥水平对不同土壤CH4排放的影响 |
| 摘要点击 2202 全文点击 1508 投稿时间：2004-05-26 修订日期：2004-09-13 |
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| 中文关键词 CH4排放 氮肥 稻田 盆栽试验 |
| 英文关键词 CH4 emission N fertilizer rice paddy soils pot experiment |
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| 中文摘要 |
| 鉴于氮肥施用对农田CH4排放的影响还有很大不确定性,室外盆栽试验于2002年在南京农业大学实施.选取3个供试土壤,各土壤设置对照和低、中、高3个不同氮肥水平,施入尿素量分别为0 g/盆钵(对照) ,0.64g/盆钵,(低氮水平) ,1.28g/盆钵(中氮水平) ,1.93g/盆钵(高氮水平) .结果表明在水稻生长季,不同氮肥(尿素)施用量对稻田土壤CH4排放影响表现为不同土壤之间,及不同氮肥水平之间CH4排放均存在显著差异.无氮肥施入的情况下,3种土壤的CH4季节性累积排放量存在显著差异,分别为6.7g/m2,12.6g/m2 和8.3g/m2.施加氮肥后,3种土壤的CH4排放量随氮肥施入量的增加,均表现为降低趋势,不同土壤CH4排放量存在差异,土壤背景氮含量最高的F(江苏溧水)土壤的CH4排放都比相应氮肥水平下的G(江苏涟水)和H(江苏农科院)土壤的CH4排放低1倍左右.更进一步发现从低氮到中氮水平,3种土壤CH4排放量随氮肥用量的增加降低幅度最大,而此时各土壤的NH4-N含量随氮肥用量增加明显提高,推断造成CH4排放降低的主要可能原因是各土壤的氨态氮含量的增加所致.从中氮到高氮水平3种土壤的CH4排放量的变化不尽相同,G和H土壤的CH4排放量随氮肥用量的增加而降低,而F土壤在中氮和高氮水平下的CH4排放量没有明显变化,值分别为30g/m2. |
| 英文摘要 |
| To investigate the effect of different urea incorporation amount in different soils on CH4 emission, a pot experiment was carried in 2002. Four treatments were designed as the control (without urea incorporation); low N fertilizer level(0.64g urea/pot); middle N fertilizer level (1.28g urea/pot); high N fertilizer level (1.93g urea /pot). During rice growing season, incorporation of urea into different soils yielded different influence on CH4 emission. Without urea incorporation, significance differences existed among CH4 emission flux of three soils, with the values of 6.7g/m2,12.6 g/m2 and 8.3 g/m2, respectively. Incorporation of urea reduced considerably CH4 emission of three soils. A further investigation indicate that CH4 emission of three soils largely decreased and three soils NH4+-N content obviously increased from low N fertilizer level to middle N fertilizer level. It concluded that soil NH4+-N content is a key influence factor on CH4 emission after incorporation of urea into soils. From middle N level to high N level, CH4 emision of soil G(Lianshui,Jiangsu) and H(Jiangsu Academy of agricultural sciences) reduced, while CH4 emision of soil F(Lishui,Jiangsu) had no obvious significance with the value of 3.0g/m2 and 3.4 g/m2. |
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