目录
摘要Ⅱ
关键词Ⅱ
AbstractⅢ
引言
引言1
1 材料与方法3
1.1 田间试验3
1.1.1 试验地点与供试材料3
1.1.2 试验设计3
1.2样品测定方法3
1.2.1 氨挥发的采集与测定3
1.2.2 土样的采集与理化性质的测定4
1.3 数据处理与分析 4
2 结果与分析4
2.1 硅酸盐钝化剂施用对稻田氨挥发的影响4
2.1.1 对氨挥发速率的影响5
2.1.2 对氨挥发累积量的影响6
2.2 硅酸盐钝化剂施用对土壤理化性质的影响6
2.2.1 对土壤pH的影响6
2.2.2 对土壤电导率的影响7
2.2.3 对土壤铵态氮的影响8
2.2.4 对土壤硝态氮的影响9
2.3 氨挥发速率与土壤理化性质之间的Pearson相关性分析10
3 讨论 10
3.1 硅酸盐钝化剂施用对稻田氨挥发的影响10
3.2 硅酸盐钝化剂施用对稻田氨挥发的影响机理12
3.3 影响稻田氨挥发的其他因素12
3.4 研究展望12
致谢12
参考文献13
硅酸盐钝化剂施用对稻田NH3挥发的影响
摘 要
在对水稻的需求量逐渐增加而耕地面积逐渐减少的背景下，增加水稻单产是保障中国粮食安全和社会稳定的唯一出路。氮素施用是我们如今常用的增产方式，而氨挥发(NH3)是氮肥施入农田后的主要损失途径，这不仅会导致氮肥利用率降低，还会对环境造成污染。本文旨在研究硅酸盐钝化剂施用对稻田NH3挥发的影响及其影响机制，为减少稻田氨挥发以及钝化剂的合理施用提供数据支持。本研究于江苏省兴化市戴南镇进行稻田原位观测试验，设置了：基肥为当地普通肥料的常规处理组（T1）、基肥为当地普通肥料并添加硅酸盐钝化剂的钝化剂处理组（T2），并同步测定了稻田NH3挥发速率，计算NH3挥发累积量，此外检测了pH、电导率、土壤铵态氮和土壤硝态氮等指 *51今日免费论文网|www.51jrft.com +Q: ^351916072# 
标。结果表明钝化剂施用显著提高了氨挥发速率，增加了氨挥发累积量，显著促进稻田氨挥发。综合考虑土壤pH、铵态氮、硝态氮等理化性质的变化，可以推测氨挥发的增加可能与钝化剂施用引起的有机质含量变化及对氮循环的影响有关。与此同时，钝化剂的适宜用量以及合理施用方式也需要重点关注并进行深入研究。
EFFECT OF SILICATE PASSIVATION AGENT APPLICATION ON NH3 VOLATILIZATION IN RICE FIELDS
ABSTRACT
Under the background of increasing demand for rice and decreasing arable lands, increasing rice yields is the only way to ensure Chinese food security and social stability. Nitrogen application is our common way to increase production today, and ammonia volatilization (NH3) is the main loss route after nitrogen fertilizer is applied to farmland, which will not only lead to a decrease in nitrogen fertilizer utilization, but also pollution of the environment. The purpose of this paper is to study the effect of silicate passivation on NH3 volatilization in rice fields and its effect mechanism, and to provide data support for reducing ammonia volatilization and rational application of passivators in rice fields. This in situ observation experiment of rice fields was carried out in Dainan Town, Xinghua City, Jiangsu Province, which included two treatments as: T1, local conventional fertilization for base fertilizer; T2, conventional fertilization combined with silicate passivator for base fertilizer; the NH3 volatilization rate in rice field, accumulation of NH3 volatilization, soil pH, NH4+N and NO3N content, were all assessed in this experiment. Results showed that the passivator significantly increased ammonia volatilization rate and accumulation, thus enhanced ammonia volatilization in rice field. Taking into account the changes in the physical and chemical properties of soil pH, ammonium nitrogen and nitrous nitrogen, it can be speculated that the increase in ammonia volatilization may be related to changes in organic matter content caused by the application of passivators and their effection on nitrogen circulation. At the same time, the appropriate dosage of passivators and reasonable application methods also need to focus on and conduct indepth research.

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