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| Effect of single basal fertilization on N2O emissions in wheat and maize rotation system |
| Received:July 21, 2015 |
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| KeyWord:single fertilization;wheat and maize rotation system;N2O emission |
| Author Name | Affiliation | E-mail | | ZHANG Jing | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/ Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture/ CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Beijing 100081, China | | | XIA Guang-li | Taian Academy of Agricultural Sciences, Taian 271000, China | | | LI hu | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/ Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture/ CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Beijing 100081, China | | | ZHU Guo-liang | Taian Academy of Agricultural Sciences, Taian 271000, China | | | MOU Xiao-ling | Taian Academy of Agricultural Sciences, Taian 271000, China | | | WANG Li-gang | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/ Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture/ CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Beijing 100081, China | wangligang@caas.cn | | HUANG Cheng-cheng | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/ Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture/ CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Beijing 100081, China | | | JIANG Yu-qian | Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences/ Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture/ CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research, Beijing 100081, China | |
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| Abstract: |
| Nitrous oxide(N2O), as one of the most important greenhouse gases, plays a crucial role in the global warming. Nitrogen(N) fertilizer is the primary source of N2O emissions from agricultural soils. A field experiment was conducted to study the effect of single basal fertilization on N2O emissions in wheat and maize rotation system. N2O fluxes along with main environmental drivers(i.e., soil temperature, soil moisture, and soil NO3--N) were observed in 4 treatments, including control treatment(CK), optimized fertilization treatment(OPT), single basal fertilization treatment(OPT1) and controlled release fertilization treatment(CRF), during the period of October 2013 to October 2014. Results showed that the peaks of N2O emissions were usually observed at the event of fertilization accompanied with irrigation or precipitation. The N2O emission rates ranged from -0.24~2.78 mg N2O·m-2·h-1, with daily means ranging from 23.88~65.46 μg N2O·m-2·h-1. The OPT1 and CRF treatments both decreased the N2O peak values, but did not change the seasonal variation patterns. The N2O fluxes were pos-itively correlated with soil water filled pore space(WFPS), but not with soil temperature at 5 cm depth. Compared with the OPT treatment, the OPT1 and CRF treatments both significantly reduced annual N2O emissions by 27.47% and 22.80%, respectively. Annual emission factor(EF) of N2O emissions was calculated to be 0.28%~0.77% of the fertilizer N. It is concluded that single basal fertilization management could effectively reduce N2O emissions from wheat and maize rotation system. |
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