氮素水平与施氮方式对稻田氨挥发影响

采用氨挥发的静态吸收法研究了5个不同施氮（尿素）梯度以及3种施肥方法（深施、表施、混施）在3个不同施肥时期的氨挥发损失变化特征。结果表明：随着施氮量的增加,氨挥发通量呈现上升趋势,随着施氮量的提高氨挥发损失量占施氮总量的比例逐渐升高,水稻施用尿素后的氨挥发损失在各个施肥时期比例不一,其中以蘖肥时期损失最大,其次是基肥,穗肥时期氨挥发损失最小。每次施肥后氨挥发持续时间大约7d,在2～4d达到最大值,氨挥发损失随着施氮的增加呈明显增高趋势,其中表施肥最为明显。

Nitrogen Levels and Nitrogen Application Modes on Ammonia Volatilization Effect

Using static absorption method,the study of five different nitrogen fertilizer（urea）gradient as well as three fertilization methods（deep application,application,applying mixed）on ammonia volatilization characteristics in three different fertilizing period was conducted.The results showed that：with the increase of nitrogen amount,ammonia volatilization fluxes showed a rising trend,with the increase of nitrogen application amount,ammonia volatilization loss accounted for the proportion of the total increase gradually.The ratio of ammonia volatilization in various fertilization periods was different.The biggest loss was in tillering period,followed by basal fertilizer,and panicle fertilizer period was the least.Every time after fertilization,ammonia volatilization lasted for about a week,around 2 to 4 days reach the maximum value,the amount of ammonia volatilization of nitrogen increased significantly with increasing trend,the obvious mode was the most evident.