硝化抑制剂和通气调节对土壤N2O排放的影响
Effect of nitrification inhibitor and aeration regulation on soil N2O emission
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摘要: 采用室内培养方法,研究了土壤水分含量和温度对硝化反应速度、N2O排放及施用硝化抑制剂(N-Serve)和土壤掺砂对N2O排放的影响。结果表明,硝化反应速度随温度升高而加快,30℃时反应进行最快;水分对硝化反应速度的影响不显著。N2O排放通量随温度和水分含量升高而加大,最高排放通量出现在水分含量28.5%,20℃或30℃时。30℃、低水分(14.2%)时,N2O排放量较低,15d累积排放量为126.4.mg/kg,且主要来自硝化反应,施用N-Serve可使总排放量减少65.0%;水分含量增加到28.5%,反硝化反应发生,N2O排放量急剧增加,15d累积排放量达764.4.mg/kg;施用砂子或N-Serve,总排放量分别减少82.9%、62.1%。因此,低水分时,施用N-Serve可抑制硝化反应;高水分时,施用砂子或砂子与N-Serve配合,可有效抑制N2O排放。Abstract: Laboratory incubation experiments were carried out to investigate effects of soil moisture and temperature on(nitrification) rate and N2O emission,and effects of nitrification inhibitor(N-Serve) incorporated with sand on N2O emission.The rate of nitrification was increased with the rising of soil temperature,with the highest rate at 30 ℃;soil moisture didn't affect the rate of nitrification significantly.N2O emission is increased with the rising of soil temperature and moisture.The highest N2O emission occurred at soil moisture being 28.5% and soil temperature being 20℃ or 30 ℃.At 30 ℃,N2O production was quite low under moisture stress(14.2%) with a cumulative N2O emission being 126.4 (mg/kg),which was primarily from nitrification;cumulative N2O emission was decreased by 65.0% when 80mg/kg N-Serve was added.Cumulative N2O emission increased rapidly with the cumulative emission being 764.4 mg/kg when soil moisture increased to 28.5% under which denitrification occured;however,it was decreased by 82.9% and 62.1%,(respectively) when mixing sand at a ratio of 1∶1 or adding N-Serve.We could conclude that applying N-Serve could(inhibit) nitrification at low soil moisture,while at the high soil moisture,applying sand or combine applying sand with N-serve could inhibit N2O emission efficiently.
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