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Dynamics of N2O concentration, diffusion flux, and net turnover rate in the soil profile of a typical vegetable field(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2019 03
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Dynamics of N2O concentration, diffusion flux, and net turnover rate in the soil profile of a typical vegetable field
MA Zhiyong1 JIA Junxiang1** XIONG Zhengqin2 XU Jianmin1 WANG Ling1 & ZHANG Jing1
1 College of Resources and Environment, National Experimental Teaching Demonstration Center for Agricultural and Environmental, Shanxi Agricultural University, Taigu 030801, China 2 Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation / College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
vegetable plot soil profile nitrous oxide diffusive flux net turnover rate

The concentrations of nitrous oxide (N2O) at 7, 15, 30, and 50 cm soil depths under bare fallow, rotation vegetable field (rotation of Garland chrysanthemum-Tung choy-Bok choy) were monitored using a special in situ soil gas collection device and gas chromatography, to explore the production site, diffusion flux, and net turnover rate of N2O in soil profiles. The results showed that the concentration profile of N2O was dramatically spatially and temporally variable. Average N2O concentration at depths of 7 cm, 15 cm, 30 cm, and 50 cm from rotation vegetable field were 1.9, 8.7, 9.2, and 26.7 times that in the corresponding soil layer from the bare fallow field, respectively. Average N2O concentration increased with soil depth within the range of 0–30 cm soil layer, then decreased at the depth of 30–50 cm. These indicated that large nitrogen fertilizer application promoted N2O production at the top soil layers. The diffusion fluxes ranged from -354 to 420 μg N m-2 h-1 in bare fallow and 482 to 1 510 μg N m-2 h-1 in rotation field, respectively. It was concluded that N2O was mainly absorbed by soil at the 30–50 cm layer according to negative N2O diffusion fluxes value at the same soil layer. The diffusion fluxes at the 7–15 cm layer in the rotation field, which was as high as 1 510 μg N m-2 h-1, were higher by 68.1%, 2.5%, and 36.6% than those at 0–7 cm, 15–30 cm, and 30–50 cm soil layers, respectively. Therefore, the key site of N2O production was at depths of 7–30 cm in the soil profile. Net N2O turnover rates from bare fallow and rotation vegetable were negative at the 0–15 cm soil layer but positive at the 15–50 cm. It was concluded that the fastest N2O turnover occurred in the middle layer of the soil profile (7–30 cm). In conclusion, the distribution of N2O concentration first increased and then decreased with the increase in N2O concentration. N2O was mainly produced at the depth of 30 cm and was diffused to ambient. These results could be used as references for understanding N2O production sites and transformation process in vegetable field ecosystems.


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Last Update: 2019-06-25