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。
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.
出处
《植物营养与肥料学报》
CAS
CSCD
北大核心
2006年第1期32-36,共5页
Journal of Plant Nutrition and Fertilizers
基金
中国科学院野外台站基金
中国科学院知识创新项目(KZCX2-4133)
国家科技攻关项目(2004BA508B15)资助
关键词
温度
水分
硝化抑制剂
通气状况
N2O
temperature
soil moisture
nitrification inhibitor
aeration regulation
N2O emission
