放牧对草原十壤N2O产生及微生物的影响

利用AIM乙炔抑制法 ,首次测试了我国内蒙古放牧和非放牧羊草草原土壤N2 O产生的微生物过程 ;通过分析不同类型草原土壤N2 O产生的微生物过程和相关微生物菌群的季节变化 ,研究了放牧行为对于草原土壤N2 O微生物产生过程的影响 .放牧行为改变了土壤结构 ,有利于土壤微生物反硝化作用的发生 ,在一定程度上降低了草原土壤N2 O的排放 .揭示了内蒙古草原土壤N2 O产生是以异养硝化作用过程为主的微生物过程 ,解释了内蒙古典型草原土壤N2 O通量较低和其季节变化的微生物学机理

Effect of Grazing on Microbiological Processes of N2O Production in Grassland Soils

A laboratory incubation study on effect of grazing on microbiological processes of N 2O production in Aneurolepidium chinense grassland soils by using the acetylene inhibition method was firstly conducted and the seasonal variations of related bacteria groups and N 2O fluxes were analyzed. Results suggested that grazing behavior altered the soil structure which were benefit to microbiological denitrification so that N 2O emission from this steppe soil was reduced. It was the heterotrophic nitrification that is the key microbiological process for N 2O production in the non grazing and grazing semi arid typical grassland soils in Inner Mongolia. The reasons why N 2O flux from Inner Mongolia semi arid typical grassland soils was lower were also explained in this paper.