| 摘要: |
| 【目的】研究不同施氮量对夏玉米收获后0～200 cm土层硝态氮分布、累积及土壤氮素平衡的影响。【方法】2009年在位于陕西关中西部地区的户县、周至2县分别设置了6个田间试验，测定了不同施氮量处理下夏玉米收获后土壤剖面硝态氮的含量，计算了土壤氮素平衡值。【结果】夏玉米收获后，在0～200 cm土层，随着土层深度的增加，土壤硝态氮含量呈下降后升高的趋势。随着氮肥用量的提高，夏玉米收获后0～200 cm土层土壤硝态氮累积量明显增加，二者呈显著正相关关系。随着施氮量的增加，土壤氮素平衡值逐渐增大，其中，当施氮量为90～150 kg/hm2时，土壤氮素基本达到平衡；当施氮量达270～450 kg/hm2时，土壤氮素有明显盈余。土壤氮素平衡值与0～200 cm土层土壤硝态氮累积量之间呈极显著正相关关系，土壤氮素平衡值每增加100 kg/hm2，0～200 cm土层土壤硝态氮累积量增加约48 kg/hm2。【结论】在夏玉米生长季，土壤氮素平衡决定了土壤剖面中硝酸盐的累积状况。 |
| 关键词: 夏玉米 施氮量 土壤硝态氮 氮素表观盈亏 |
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| 基金项目:国家“十二五”科技支撑计划项目（2012BAD15B04）；国家自然科学基金项目(40773057)；西北农林科技大学创新团队项目 |
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| Accumulation of NO-3-N in soil profile and its relationship with nitrogen balance in summer maize field with different |
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LIU Rui,ZHOU Jian-bin,CUI Ya-sheng,et al
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| Abstract: |
| 【Objective】The experiment was carried out to study the effects of different nitrogen (N) application rates on the distribution, accumulation of NO3--N in soil profile of 0-200 cm and N balance after harvesting summer maize.【Method】In 2009,six field experiments were carried out in Huxian County and Zhouzhi County in Guanzhong,Shaanxi.After harvesting summer maize with different nitrogen application rates,the NO3--N in soil profile and the N balance were determined.【Result】The amount of NO3--N accumulated in the soil profile and the N balance in soil increased significantly as the increase of nitrogen fertilizer use.When 90-150 kg/hm2 nitrogen was used,the soil nitrogen was balanced;while when 270-450 kg/hm2 nitrogen was used,increase of the soil nitrogen content was observed in all experiment sites.There was a positive correlation between the soil N balance and the accumulation of NO3--N in soil profile of 0-200 cm.Increase of N balance by 100 kg/hm2 increased NO3--Naccumulation in soil profile by 48 kg/hm2.【Conclusion】The amount of NO3--N in soil profile was mainly determined by the N budget balance in summer maize growing season. |
| Key words: summer maize N-fertilizer rate soil NO3--N N budget in soil |
