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| Effects of biogas slurry irrigation on CO2 and N2O emission from winter wheat-summer maize rotation farmland |
| Received:December 01, 2016 |
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| KeyWord:biogas slurry irrigation;winter wheat-summer maize rotation;CO2;N2O;cumulative emission;crop yield |
| Author Name | Affiliation | E-mail | | WANG Xiao-fei | College of Land and Environment, Shenyang Agriculture University, Shenyang 110866, China
Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | SHEN Shi-zhou | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YIN Gao-fei | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | YAN Jian-hua | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | DU Hui-ying | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | | | ZHANG Ke-qiang | Agro-Environmental Protection Institute, Ministry of Agriculture, Tianjin 300191, China | kqzhang68@126.com |
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| Abstract: |
| To investigate the effects of biogas slurry irrigation on CO2 and N2O emissions and soil physicochemical properties, in winter wheat-summer maize rotation system, five different irrigation modes were set up, including blank control(CK), fertilization treatment(CF), 2:1 biogas slurry irrigation for two times(one time in wheat season and one time in corn season)(T1), 2:1 biogas slurry irrigation for three times(two times in wheat season and one time in corn season)(T2) and 1:1 biogas slurry irrigation for three times(two times in wheat season and one time in corn season) (T3). In the study, Static-Gas Chamber method was applied to study the soil CO2 and N2O emission from winter wheat-summer maize rotation cropping system under the condition of marsh fluid biogas irrigation. The meteorological condition, soil ammonium nitrogen, nitrate nitrogen, soil soluble organic carbon and crop yield were also monitored. The characteristics of CO2 and N2O emissions from cropland soil and their influencing factors were analyzed and discussed, and a reasonable biogas slurry irrigation model was put forward. The results showed that the biogas irrigation did not affect the seasonal variation of soil CO2 and N2O emission flux during the rotation cycle, however, it could cause the short-term emission increase after irrigation. The CO2 emission level was increased by different biogas slurry irrigation treatments in a certain extent, but the difference was not significant except T3. The biogas irrigation treatments did not improve the N2O emission level significantly. The content of soil soluble organic carbon was increased by biogas slurry irrigation treatments and was decreased with the application of chemical fertilizers. Compared with conventional fertilization treatment, there was no significant difference between the crop yield of T2 and T3, but the yield of T1 was significantly decreased. Considering the crop yield and CO2 and N2O accumulated emissions, T2 treatment was the most reasonable biogas slurry irrigation mode under this study condition. |
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