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| Effects of chamber size and calculation method on N2O emissions during the summer maize growing season |
| Received:October 17, 2017 |
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| KeyWord:N2O emissions;chamber size;root growth;calculation method;summer maize field |
| Author Name | Affiliation | E-mail | | LIU Min | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China
College of Resources and Environmental Sciences, Qinzhou University, Qinzhou 535000, China | | | ZHANG Chong | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China | | | JU Xiao-tang | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China | juxt@cau.edu.cn | | SU Fang | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China | sufang@cau.edu.cn | | CHEN Xin-ping | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China | | | JIANG Rong-feng | Beijing Key Laboratory of Farmland Soil Pollution Prevention and Remediation, College of Resources and Environmental Science, China Agricultural University, Beijing 100193, China | |
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| Abstract: |
| Chamber sizes and calculation methods may significantly affect the measurement results for N2O emissions in terrestrial ecosystems when the static chamber method is used. This study compared the N2O emissions of summer maize growing season on the North China Plain under four treatments regarding different chamber sizes and calculation methods, i.e., big chamber+linear model, small chamber+linear model, big chamber+quadratic/linear model, and small chamber+quadratic/linear model. N2O fluxes were measured by the static chamber-gas chromatograph method. When the big chamber(hampering the growth of maize) was compared with the small chamber(no destructive effect on maize growth), the results showed that the use of the big chamber had no significant effect on the total cumulative N2O emissions across the whole maize growth season. The daily N2O flux calculated by the quadratic/linear model was not significantly difference with that by the linear model when the daily N2O flux was high. However, the daily N2O flux calculated by the quadratic/linear model was higher than the flux calculated by the linear model when the daily N2O flux was relatively low. As the N2O emissions within the low N2O flux events only made a small contribution to total cumulative N2O emissions of whole summer maize season, no significant differences were observed in total cumulative N2O emissions between the quadratic/linear model and the linear model. |
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