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| Characteristics of NO Emissions from Purple Soil Under Summer Maize-Winter Wheat Rotation |
| Received:February 02, 2015 |
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| KeyWord:NO emission;maize-wheat rotation;purple soil;synthetic NPK fertilization |
| Author Name | Affiliation | E-mail | | HU Ting-xu | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LIU Yun | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | KE Yun | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Southwest Jiaotong University, Chengdu 610031, China | | | ZHU Bo | Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, Chengdu 610041, China
Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China | bzhu@imde.ac.cn |
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| Abstract: |
| Static-gas collection technique combined with chem-luminescent analyzer was used to measure NO emitted from agro-ecosystem of purple soil under summer maize-winter wheat rotation during June 2013 to May 2014. Long term synthetic NPK fertilizer(NPK) and no fertilizer treatments(CK) were used to calculate NO emission factor(EF) induced by N fertilization. Fertilization was the cause of NO emissions in both maize and wheat seasons. The NO emissions reached peak 20 days after fertilization, and then decreased and maintained at low fluxes during the rest period of the season. The cumulative NO emissions during whole maize-wheat rotation was 0.450 kg N·hm-2, of which the maize season accounted for 0.200 kg N·hm-2 with EF of 0.13% while the wheat season was 0.250 kg N·hm-2 with EF of 0.20%. There was significant relationship between NO emission flux and soil temperature and soil moisture in the maize season, whereas no relationship was found in the wheat season. This may imply complicated influencing factors of soil NO emissions. Plant growth reduced NO emissions compared to bare soil due to the N absorption by plants. |
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