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| Annual Fluxes of Nitric Oxide from a Tea Plantation Ecosystem |
| Received:March 17, 2015 |
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| KeyWord:tea plantation;fertilization;nitric oxide;emission factor |
| Author Name | Affiliation | E-mail | | WEI Yun-dong | College of Agriculture, Guangxi University, Nanning 530004, China
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | | | YAO Zhi-sheng | State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | zhishengyao@mail.iap.ac.cn | | LUO Xian-bao | College of Agriculture, Guangxi University, Nanning 530004, China | | | ZHANG Li | Agricultural Bureau of Fangxian, Hubei Province, Shiyan 442100, China | | | ZHENG Xun-hua | State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China | |
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| Abstract: |
| To quantify annual nitric oxide(NO) fluxes and to explore the underlying mechanisms and factors controlling NO fluxes from tea fields, we performed in situ measurements of NO fluxes for a full year in a subtropical tea field with different fertilization managements(i.e., conventional farmers' practice with urea application, alternative practice with organic fertilizer application, and no nitrogen application as a control). Static opaque chamber and chemiluminescent analysis were used. Results demonstrated that the majority of NO fluxes occurred during tea tree-growing period from March to September(i.e., in the spring and summer seasons), accounting for approximately 58%~73% of annual cumulative NO fluxes from the fertilized tea fields. During this period, soil ammonium content was the key environmental factor regulating the temporal variations of NO fluxes. The cumulative NO fluxes were about 2.85, 19.42 and 17.04 kg N·hm-2 for the control, urea and organic fertilizer treatments, respectively, with fertilization significantly increasing NO fluxes. Of the fertilized treatments, applying organic fertilizer significantly reduced annual NO emissions by 12%, as compared to urea application. The direct emission factor of NO for urea and organic fertilizer amendments was estimated to be 3.68% and 3.15%, respectively, highlighting high NO emissions from tea plantations. |
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