| Characteristic variations of N2O flux in winter wheat field under different tillage methods |
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| DOI：10.7606/j.issn.1000-7601.2016.03.35 |
| Key Words: N2O emission winter wheat field tillage methods soil moisture greenhouse gases emissions reduction |
| Author Name | Affiliation | | CHEN Xiao-long | School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
Hefei Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture, Hefei, Anhui 230036, China | | YANG Wei | School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
Hefei Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture, Hefei, Anhui 230036, China | | JIANG Bo | Institute of Economic Research, Anhui Development and Reform Commission, Hefei, Anhui 230001, China | | YIN Han-xu | School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China
Hefei Scientific Observing and Experimental Station of Agro-Environment, Ministry of Agriculture, Hefei, Anhui 230036, China | | YANG Xiao-bing | School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China | | YANG Shu-yun | School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China | | MA You-hua | School of Resources and Environment, Anhui Agricultural University, Hefei, Anhui 230036, China |
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| Abstract: |
| The N2O emission fluxes and seasonal variations by four treatments including blank control (CK), conventional tillage (CG), no tillage (CB), and straw application tillage (CJ) were sampled and measured by static chamber-gas chromatographic. The soil temperature, water content, NH+4, Eh and other related factors were monitored at the same time. The results indicated that N2O emission flux by four treatments showed significantly seasonal variations and each treatment displayed a consistent trend. However, emission flux of the blank control were less subjective to seasonal changes in volatility than others. In addition, during wheat growing season, all farmland treatments were N2O emission sources. Compared with the blank control, the N2O total emission fluxes by conventional tillage, no tillage and straw application tillage were increased by 0.89 kg·hm-2, 0.41 kg·hm-2 and 1.02 kg·hm-2, respectively. Moreover, air temperature and soil temperature at 5 cm and 10 cm layers were not related to N2O emission flux, indicating that these were not the significant limiting factors as the wheat field N2O emissions flux. N2O emission fluxes by all treatments and soil moisture showed a positive correlation (P<0.05). By comparing the relationship between precipitation and pre and post fertilization, it was found that N2O emissions flux could be significantly reduced by fertilization after rains. The increase of water content caused by precipitation was the factor that affected the dramatic change of N2O emissions flux. Furthermore, no tillage and straw application tillage had the best effects on N2O emissions and wheat production among the four treatments. For N2O abatement and wheat yield, straw application tillage is the most appropriate approach. |
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