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| Effects of Herbicides on N2O Emissions and Soil Biochemical Parameters in Winter-Wheat Field |
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| KeyWord:acetochlor; tribenuron-methyl; fenoxaprop-P-ethyl; N2O emissions; nitrification and denitrification |
| Author Name | Affiliation | | CHEN Lin-mei | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | SUN Qing | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | CHEN Ling | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | JIANG Jing-yan | College of Resource and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China |
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| Abstract: |
| Research has shown that herbicides may inhibit non-target soil microbes and their biochemical processes. Here we conducted an experiment to examine the effects of herbicide applications on N2O emissions and related biochemical parameters in a winter-wheat soil. Applying acetochlor（AC） and tribenuron-methyl（TBM） and fenoxaprop-P-ethyl（FE） mixture significantly decreased N2O emissions by approximately 50% in the first ten days following herbicides application（P<0.05）, while fenoxaprop-P-ethyl（FE） or tribenuron-methyl（TBM） alone reduce N2O emissions by 28.6% and 26.0%, respectively, compared to the control, but they were not statistically significant（P>0.05）. For the remaining sampling days, AC, TBM, FE and TBM+ FE all had no significant effects on N2O emissions. The average N2O flux was respectively 95.3%, 101.8%, 92.5% and 88.7% of the control. Soil urease activity was always enhanced by AC during measurement period（P<0.05）, while was inhibited initially but stimulated afterwards by FE or TBM+ FE. TBM did not influence urease activity（P>0.05）. In the first ten days of herbicide application, N2O fluxes were correlated positively with soil water-filled pore space（WFPS）, denitrifying bacteria（DNB）（P<0.01） and ammonia-oxidizing bacteria（AOB）（P<0.05）, but negatively with soil dissolved organic carbon（DOC）（P<0.05）. Due to less abundance of DNB in AC and TBM+FE plots and AOB in TBM+FE plots, N2O emissions were significantly inhibited in AC and TBM+FE. TBM or FE had no significant effects on N2O emissions from the wheat field, mainly due to their alternative promotion and inhibition of AOB and DNB. More studies are necessary to better understand the effects and mechanisms of different herbicides on N2O emissions. |
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