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| Effects of drip irrigation on soil CO2 and N2O emissions and their global warming potentials of spring wheat field in arid region |
| Received:November 15, 2015 |
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| KeyWord:drip irrigation;spring wheat;CO2 emission;N2O emission;global warming potentials(GWPs) |
| Author Name | Affiliation | E-mail | | GUO Shu-fang | Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | QI Yu-chun | Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | LUO Xiao-ling | Food Quality Supervision and Testing Center of Ministry of Agriculture, Xinjiang Academy of Agricultural Reclamation Science, Shihezi 832000, China | | | LIU Chang-yong | Food Quality Supervision and Testing Center of Ministry of Agriculture, Xinjiang Academy of Agricultural Reclamation Science, Shihezi 832000, China | | | PENG Qin | Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | YAN Zhong-qing | Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | DONG Yun-she | Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | dongys@igsnrr.ac.cn |
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| Abstract: |
| Drip irrigation is a new water-saving irrigation technique and is widely applied in arid region in Xinjiang. However, there is little information available about its effects on greenhouse gas emissions. In this study, a field experiment was conducted to compare the effects of both drip irrigation and conventional flood irrigation on soil CO2 and N2O emissions during the spring wheat growing season using static close chamber method. Under drip irrigation, gas sampling was performed at between the pipes(BP) and on the pipe(OP). Results showed that:average CO2 emissions under drip irrigation was 35.76% lower than that under flood irrigation during the spring wheat growing season, with significant difference. Average CO2 emissions from BP and OP were 906.28 and 838.25 mg·m-2·h-1, respectively. No differences were found between them. N2O emissions under drip irrigation was 74.81 μg·m-2·h-1 or 25.87% higher than that under flood irrigation. Average N2O emissions from OP and BP were 85.76 and 63.62 μg·m-2·h-1, respectively. However there was no significant difference between drip and flood irrigation systems(P>0.05). Cumulative emissions under drip and flood irrigations were respectively 2188.68 and 3180.91 g·m-2 for CO2, and 188.62 and 160.60 mg·m-2 for N2O. The global warming potentials of CO2 and N2O under drip irrigation was 983.55 g CO2·m-2 lower than that under flood irrigation. Significant correlations were observed between soil CO2 emissions from BP and air temperature, soil temperature at 5 cm and 10 cm depth(P<0.05) and soil microbial biomass carbon at 10~20 cm depth(P<0.05), and also between soil N2O emissions under flood irrigation and soil water content at 0~10 cm and 10~20 cm depth(P<0.05). Soil N2O emissions from OP were significantly correlated with soil water content at 0~10 cm depth(P<0.05) and that from BP were significantly correlated with soil NH4+-N at 10~20 cm depth. |
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