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当前位置: 首页 > 文章 > pH变化对中性土壤硝化过程N_2O释放的影响 农业环境科学学报 2009,28 (08) 1748-1752
Position: Home > Articles > Effect of pH on N_2O Emission from Nitrification in Neutral Soil Journal of Agro-Environment Science 2009,28 (08) 1748-1752

pH变化对中性土壤硝化过程N_2O释放的影响

作  者：
王小治;孙伟;王子波;封克
单  位：
扬州大学环境科学与工程学院
关键词：
N2O;pH;硝化作用;DCD
摘  要：
通过人为调节获得pH5.82、pH6.95和pH7.55的3种pH土壤,采用室内培养方法,研究了pH变化对土壤硝化过程N2O产生以及双氰胺(DCD)对硝化过程抑制作用的影响。结果表明,在好气培养2d内,土壤硝化速率与pH呈正相关关系;在12d的培养期间,土壤N2O释放总量随pH增大而增大,最大N2O释放量占施氮量的0.363%;pH变化影响土壤硝化作用的强弱以及硝化过程中N2O/N2的比例;pH变化对DCD的抑制作用影响显著,DCD对N2O释放总量的抑制率为34.4%～72.2%,当pH5.82时抑制作用最强。
译  名：
Effect of pH on N_2O Emission from Nitrification in Neutral Soil
作  者：
WANG Xiao-zhi,SUN Wei,WANG Zi-bo,FENG Ke(College of Environmental Science and Engineering,Yangzhou University,Yangzhou 225009,China)
关键词：
N2O;pH;nitrification;DCD
摘  要：
Three soil samples with pH5.82,pH 6.95 and pH7.55 were obtained through incubation after adding NaOH or H2SO4 to a neutral soil.The impacts of changed soil pH on N2O emission from nitrification process,and inhibition effects of dicyandiamide(DCD)on nitrification during the aerated incubation were studied.The results showed that during the first 2 d incubation,soil nitrification abilities had a positive relationship with soil pH.Soil with higher pH had more N2O emission during 12 d incubation.The ratio of the maximum amount of nitrogen loss by N2O emission to amount of nitrogen applied was 0.363% which occurred in soil with pH7.55.The change of soil pH affected not only the nitrification activities,but the ratio of N2O to N2 during the nitrification process as well.In addition,soil pH change significantly affected the inhibition of DCD to nitrification processes.The inhibition rates of DCD to the amount of N2O emission from soil samples with different pH were within the range of 34.4%～72.2%,and the maximum inhibition rate appeared in soil with pH5.82.

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