Abstract
Aims
A field experiment was conducted to quantify annual nitrous oxide (N2O) fluxes from control and fertilized plots under open-air and greenhouse vegetable cropping systems in southeast China. We compiled the reported global field annual N2O flux measurements to estimate the emission factor of N fertilizer for N2O and its background emissions from vegetable fields.
Methods
Fluxes of N2O were measured using static chamber-GC techniques over the 2010–2011 annual cycle with multiple cropping seasons.
Results
The mean annual N2O fluxes from the controls were 46.1 ± 2.3 μg N2O-N m−2 hr−1 and 68.3 ± 4.1 μg N2O-N m−2 hr−1 in the open-air and greenhouse vegetable systems, respectively. For the plots receiving 900 kg N ha−1, annual N2O emissions averaged 90.6 ± 8.9 μg N2O-N m−2 hr−1 and 106.4 ± 6.6 μg N2O-N m−2 hr−1 in the open-air and greenhouse vegetable systems, respectively. By pooling published field N2O flux measurements taken over or close to a full year, the N2O emission factor for N fertilizer averaged 0.63 ± 0.09 %, with a background emission of 2.67 ± 0.80 kg N2O-N ha−1 in Chinese vegetable fields. Annual N2O emissions from Chinese vegetable systems were estimated to be 84.7 Gg N2O-N yr−1, consisting of 72.5 Gg N2O-N yr−1 and 12.2 Gg N2O-N yr−1 in the open-air and greenhouse vegetable systems, respectively.
Conclusions
While N2O emissions from the greenhouse vegetable cropping system tended to be slightly higher compared to the open-air system in our experiment, the synthesis of literature data suggests that N2O emissions would be greater at low N-rates but smaller at high N-rates in greenhouse systems than in open-air vegetable cropping systems. The estimates of this study suggest that vegetable cropping systems covering 11.4 % in national total cropping area, contributed 21–25 % to the total N2O emission from Chinese croplands.
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Acknowledgments
This work was supported by the National Basic Research Program of China (2012CB417102), the National Natural Science Foundation of China (NSFC-41171194, 41225003), the 111 project (B12009) and the PADA. We greatly appreciate Dr. Evan Siemann at Rice University for improving this presentation.
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Responsible Editor: Dan Murphy.
Qiaohui Liu and Yanmei Qin Contributed equally to this paper.
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Liu, Q., Qin, Y., Zou, J. et al. Annual nitrous oxide emissions from open-air and greenhouse vegetable cropping systems in China. Plant Soil 370, 223–233 (2013). https://doi.org/10.1007/s11104-013-1622-3
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DOI: https://doi.org/10.1007/s11104-013-1622-3