| 尿素肥斑中氮素形态转化初探 |
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| 引用本文： | 王曙光,侯彦林.尿素肥斑中氮素形态转化初探[J].植物营养与肥料学报,2004,10(6):594-598. |
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| 作者姓名： | 王曙光 侯彦林 |
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| 作者单位： | 1.null |
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| 基金项目： | 国家自然科学基金，中国科学院农业项目 |
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| 摘 要： | 采用特制模拟容器,通过尿素扩散形成营养斑,观察斑内NH4+、NO2-和NO3-浓度变化及它们之间的相互转化。结果表明,NH4+、NO2-和NO3-浓度在距离肥斑7～8cm处的微域达到最大,尤以NO2-浓度增加较为显著,是一般土壤NO2-水平的数千倍。随培养时间增加,NO2-和NO3-最大浓度峰向施肥点移动,但两者浓度变化趋势不同,NO2-浓度在21d前随培养时间增加而增加,之后随培养时间增加而下降,而NO3-浓度随培养时间增加一直增加。结果还表明,NO2-是尿素营养斑内主要离子形态,从NH4+到NO2-的转化比较迅速,而NO2-转化为NO3-不是短暂的过程,这可能与施肥引起的土壤pH值变化有很大关系。
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| 关 键 词： | null |
| 文章编号： | 1008-505X(2004)06-0594-05 |
| 修稿时间： | 2003年11月17 |
Primary study on transformation of nitrogen forms in the urea patch |
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| WANG Shu-guang,HOU Yan-lin.Primary study on transformation of nitrogen forms in the urea patch[J].Plant Nutrition and Fertilizer Science,2004,10(6):594-598. |
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| Authors: | WANG Shu-guang HOU Yan-lin |
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| Abstract: | Special designed container was used to simulate diffusion of urea and investigate changes of NH~ _4, NO~-_2 and NO~-_3 concentrations, and their transformation. The results indicated that the highest concentrations of NH~ _4, NO~-_2, and NO~-_3 were in the microzones 7-8cm distancing from urea patch, especially NO~-_2, which was thousands times of NO~-_2 in the bulk soil. The highest peaks of NO~-_2 and NO~-_3 concentrations moved to urea with increasing time, respectively, but they differed. The former increased with time before 21d and decreased with time after 21d, but the highest concentration of NO~-_3 always increased with time. It was also seen from the results that NO~-_2 was main ion in the urea patch, and the transformation from NH~ _4 to NO~-_2 was quickly, but it was not short process from NO~-_2 to NO~-_3, which might relate to change of soil pH resulted from fertilization. |
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| Keywords: | urea fertilizer patch nitrogen form transformation |
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