| N2O and CH4 emissions of spring wheat-pea rotation fields under different tillage patterns in dryland farming in a wet year |
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| DOI：10.7606/j.issn.1000-7601.2015.03.32 |
| Key Words: N2O CH4 spring wheat pea cultivation practices wet year dryland agriculture |
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| Abstract: |
| This study aims to illustrate the effect of tillage patters, soil temperature and soil moisture content on N2O and CH4 emissions of spring wheat-pea rotation fields in a wet year. Gases (N2O and CH4) emission were determined under four tillage patterns including no-tillage with straw mulching (NTS), no-tillage without straw mulching (NT), conventional tillage with straw mulching(TS) and conventional tillage without straw mulching (T) by static chamber-gas chromatographic techniques. The results showed that both wheat and pea fields were emission sources of N2O regardless of the patters. Emission flux of spring wheat field ranged from 0.018 mg·m-2·h-1 to 0.146 mg·m-2·h-1, while that from pea field was from 0.024 mg·m-2·h-1 to 0.210 mg·m-2·h-1. N2O average emission flux of spring wheat field was in the order of T>NT>NTS>TS, while that from pea field T>NTS>NT>TS. Both wheat and pea fields were sinks of CH4 irrespective of tillage patters. The absorbed flux of spring wheat and pea field were from 0.051 mg·m-2·h-1 to 0.212 mg·m-2·h-1 and 0.057 mg·m-2·h-1 to 0.193 mg·m-2·h-1, respectively. Average CH4 absorption fluxes of spring wheat and pea field was in the order of NTS>NT>TS>T and NTS>TS>NT>T, respectively. Significant effects on fluxes of N2O and CH4 existed across the tillage patterns. Compared with T, TS, NT and NTS reduced emissions of N2O effectively and increased the absorption of CH4. The comprehensive influence of soil temperature and soil moisture content on N2O and CH4 emission in dryland farming in a wet year was lower than that in a normal year. |
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