التفاصيل البيبلوغرافية
| العنوان: |
Application of herbicides is likely to reduce greenhouse gas (N2O and CH4) emissions from rice–wheat cropping systems. |
| المؤلفون: |
Jiang, Jingyan1 lilacjjy@njau.edu.cn, Chen, Linmei1, Sun, Qing1, Sang, Mengmeng1, Huang, Yao2 huangyao@ibcas.ac.cn |
| المصدر: |
Atmospheric Environment. Apr2015, Vol. 107, p62-69. 8p. |
| مصطلحات موضوعية: |
*HERBICIDES, *GREENHOUSE gases, *NITROGEN oxides, *CROPPING systems, *SOIL chemistry |
| مستخلص: |
Herbicides have been widely used to control weeds in croplands; however, their effects on greenhouse gas emissions remain unclear. The effects of three wheat herbicides (acetochlor, AC; tribenuron-methyl, TBM; fenoxaprop-p-ethyl, FE) and two rice herbicides (butachlor, BC; bensulfuron-methyl, BSM) on N 2 O and CH 4 emissions were investigated in this study. In the wheat growing season, applications of AC and FE + TBM significantly reduced N 2 O emissions by 31% compared with no herbicide use (p = 0.001). In the rice growing season, the application of BC significantly reduced CH 4 emissions by 58% (p = 0.022), and BSM significantly reduced N 2 O emissions by 27% (p = 0.040); however, no significant difference among treatments with regard to the aggregate emissions of N 2 O and CH 4 in the CO 2 equivalent for the 100-year horizon was observed (p > 0.05). Relative to control plots, which were not treated with herbicides, the combined application of the herbicides FE and TBM in the wheat season led to a significant decrease in greenhouse gas intensity (GHGI) by ∼41% (p = 0.002), and the application of BC together with BSM reduced GHGI by 22% in the rice season, although this reduction was not statistically significant (p = 0.158). Further investigation suggested that the inhibitory effect of herbicides on N 2 O emissions in the wheat field could be ascribed to low soil ammonium nitrogen and less abundance of denitrifying bacteria. The inhibitory effects of separate applications of BC on CH 4 emissions in rice fields, in contrast, were linked to high soil nitrate nitrogen and urease activity. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
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