| 马兰,李晓波,马舒坦.双氰胺减少铵态氮肥施用后潮土N2O排放的机制[J].农业环境科学学报,2021,40(12):2801-2808. |
| 双氰胺减少铵态氮肥施用后潮土N2O排放的机制 |
| Mechanisms of underpinning the dicyandiamide-induced N2O emissions reduction in a fluvo-aquic soil after ammonium nitrogen fertilization |
| 投稿时间：2021-04-17 |
| DOI：10.11654/jaes.2021-0459 |
| 中文关键词: 氧化亚氮 双氰胺 亚硝态氮 硝化细菌反硝化 |
| 英文关键词: nitrous oxide dicyandiamide nitrite nitrogen nitrifier denitrification |
| 基金项目:国家自然科学基金项目（41807083）；土壤与农业可持续发展国家重点实验室（中国科学院南京土壤研究所）开放基金（Y812000007）；安徽省高校自然科学研究项目重点项目（KJ2019A0495）；国家自然科学基金项目（41977097） |
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| 摘要点击次数: 1045 |
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| 中文摘要: |
| 为探讨双氰胺（DCD）减少铵态氮肥施用后氧化亚氮（N2O）的排放机制，通过开展好氧培养试验，研究DCD配施铵态氮（NH4+-N）或亚硝态氮（NO2--N）对潮土土壤N2O排放的影响，同时添加不同浓度NO2--N模拟NO2--N累积对N2O和CO2排放的影响。结果表明： DCD仅对NH4+-N氧化过程中N2O排放有抑制作用，对NO2--N还原过程中产生的N2O没有影响；培养前7 d，DCD显著抑制NH4+-N的氧化过程，降低净硝化速率，而在添加NO2--N土壤中加入DCD后净硝化速率显著增加，培养30 d后，DCD对NH4+-N和NO2--N氧化过程均没有影响；添加外源NO2--N明显促进了N2O排放，其排放通量显著高于不施肥的对照处理； N2O累积排放量同NO2--N浓度呈正相关，CO2累积排放量同NO2--N浓度呈显著负相关。研究表明，DCD可以避免NO2--N大量累积而产生的毒害作用，但仅对氨氧化过程N2O减排有效果，因此亟待研发适于抑制NO2--N产生N2O的新型抑制剂。 |
| 英文摘要: |
| This study explores the mechanisms underpinning the dicyandiamide(DCD)-reducing nitrous oxide(N2O) emissions. This was carried out using two aerobic incubation experiments to examine the effects of DCD on the production of N2O from NO2--N by adding DCD combined with NH4+-N or NO2--N. Then, the effects of NO2--N accumulation on N2O emissions was determined by adding different amounts of NO2--N. The results showed that DCD only inhibited N2O emissions during the oxidation of ammonium nitrogen(NH4+-N) and had no effect on N2O emissions during the reduction of NO2--N. DCD significantly inhibited the oxidation of NH4+-N and decreased the net nitrification rate at 7 d following incubation; however, the net nitrification rate increased significantly following the addition of DCD to NO2--N soil. Following 30 d of culture, DCD had no effect on the oxidation of NH4+-N and NO2--N. The addition of exogenous NO2--N significantly promoted N2O emissions, and these emission rates were significantly higher than those of the control treatment. Cumulative N2O emissions were significantly positively correlated with the NO2--N concentrations, whereas the cumulative CO2 emissions demonstrated the opposite relationship. These results indicate that DCD may eliminate the toxicity caused by the accumulation of NO2--N, although it is only effective in reducing N2O emissions during the oxidation of ammonia oxidation. Therefore, new inhibitors that restrict N2O production from NO2--N are urgently needed. |
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