Effect of Replacement of Headspace Gas on N2O and CO2 Emissions in Anaerobic Incubation of Soil

Effect of Replacement of Headspace Gas on N2O and CO2 Emissions in Anaerobic Incubation of Soil

CHENTONGBIN;S．STRUWE;等

【期刊名称】《土壤圈：英文版》 【年(卷),期】1997(007)004

【摘要】To study effect of C2H2 and change of headspace gas on N2O emission,denitrification,as well as CO2 emission,slurries of an agricultural soil were anaerobically incubated for 7 days at 25℃.Both N2O reduction and CO2 emissions were inhibited by the addition of 100 mL L-1 of C2H2.However,the inhibition to CO2 emission was alleviated by the replacement of headspace gas,and the N2O emission was enhanced by the replacement.Acetylene disappeared evidently from the soil slurries during the incubation.Consequently results obtained from the traditional C2H2 blocking technique for determination of denitrifcation rate,especially in a long-time incubation,should be explained with care because of its side effect exsting in the incubation environments without change of headspace gas.To reduce the possible side effect on the processes other than denitrification ,it is suggested that headspace gas should be replaced several times during a long-time incubation.

【总页数】8页(303-310)

【关键词】厌氧培育;二氧化碳;顶部空间气体;氧化二氮;排放;乙炔;土壤;氮固定