Fungi dominate denitrification when Chinese milk vetch green manure is used in paddy soil  

作　　者：Minghe Jiang Luan Zhang Ming Liu Han Qiu Shungui Zhou 

机构地区：[1]Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation,College of Resources and Environment,Fujian Agriculture and Forestry University,Fuzhou 350002,China

出　　处：《Soil Ecology Letters》2022年第2期155-163,共9页土壤生态学快报（英文）

基　　金：The research was funded by the National Natural Science Foundation of China(Project No.31600425).

摘　　要：Fungi play an important role in soil nitrous oxide(N_(2)O)emission in many agricultural soil systems.However,the effect of fungi on N_(2)O emission in Chinese milk vetch(CMV)-containing soils has not been examined sufficiently.This study investigated the contribution of bacteria and fungi to soil N_(2)O emission in CMV-amended soils.We compared soils from an experimental field in the Fujian Academy of Agricultural Sciences that had been treated with 30000 kg of CMV per 667 m2 per year with one that was not treated with CMV.We incubated soil using cycloheximide and streptomycin to differentiate fungal and bacterial N_(2)O emissions,respectively.Quantitative PCR(qPCR)was performed to investigate bacterial and fungal abundances in the two agricultural soil ecosystems.The contribution of fungi to soil N_(2)O emission in CMV-amended soils was greater than that in nonCMV-amended paddy soils,with fungi accounting for more than 56%of the emissions in CMVamended soils.Quantitative PCR showed that the ratio of the internal transcribed spacer to 16S rDNA was significantly higher in CMV-amended soils than in non-CMV-amended paddy soils.Furthermore,soil properties,such as pH(P<0.05)and NH_(4)^(+)concentration(P<0.05),significantly and negatively affected N_(2)O emission by fungi in soil,whereas the total organic carbon(P<0.05)and NO3–concentration(P<0.05)showed significant positive effects.Fungi may be important contributors to N_(2)O production in CMV-amended soils,which may create challenges for mitigating N_(2)O production.

关 键 词：FUNGI Bacteria Nitrous oxide Chinese milk vetch Paddy soil 

分 类 号：S15[农业科学—土壤学] S14[农业科学—农业基础科学]