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| Studies on emission pathways of nitrous oxide from different salinization soils |
| Received:April 22, 2016 |
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| KeyWord:salinization soil;nitrous oxide;nitrification;denitrification;contribution rates |
| Author Name | Affiliation | E-mail | | WEN Hui-yang | Chemistry & Environment Science College, Inner Mongolia Normal University, Hohhot 010022, China | | | JIAO Yan | Chemistry & Environment Science College, Inner Mongolia Normal University, Hohhot 010022, China | jiaoyan@imnu.edu.cn | | YANG Ming-de | Chemistry & Environment Science College, Inner Mongolia Normal University, Hohhot 010022, China | | | BAI Shu-guang | Chemistry & Environment Science College, Inner Mongolia Normal University, Hohhot 010022, China | | | GU Peng | Chemistry & Environment Science College, Inner Mongolia Normal University, Hohhot 010022, China | |
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| Abstract: |
| Soil salinization has great effect on the microbial activity and thus N2O emissions. Most studies focused on factors impacting N2O emission including soil moisture, salinity content, soil organic matter, soil temperature and nitrogen application rate, while little information was found about the N2O emission pathways and contribution rates in salinization soils in Northern China. In order to explore the N2O emission pathways and contribution rates, we used the inhibitors of acetylene and pure oxygen in culture experiment to study 4 kinds of different salinization soils[extremely salinization soil(SD), salinization soil(SC), severely salinization soil(SB), slightly salinization soil(SA)] in Hetao irrigation area of Inner Mongolia. The results showed that cumulative N2O emissions increased with the increasement of salinization, whose values were 289.71, 500.08, 951.66, 1 750.39 μg·kg-1, respectively. In the period of incubation, the N2O emission contribution rates of nitrification and denitrification ranged from 22.51% to 35.75% and 60.35% to 72.46%, respectively while the contribution rates of other processes ranged from 3.90% to 5.81%, which showed that denitrification remained the main process contributing to N2O emissions. At the same time, with the electric conductivity increasing, the contribution rates of nitrification increased,while the contribution rates of denitrification decreased. |
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