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| Responses of soil CH4 fluxes to simulated warming in conventional tillage and no-tillage systems |
| Received:February 12, 2016 |
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| KeyWord:simulated warming;conventional tillage system;no-tillage system;soil CH4 flux |
| Author Name | Affiliation | E-mail | | TU Chun | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | LI Fa-dong | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
University of Chinese Academy of Sciences, Beijing 100049, China | lifadong@igsnrr.ac.cn |
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| Abstract: |
| Methane(CH4) is one of the most important greenhouse gases contributing to climate warming. Understanding the responses of cropland soil CH4 fluxes to climate warming under different tillage systems is critical to evaluation of the dynamics of soil carbon sink/source along with climate changes in the North China Plain(NCP). A field experiment of simulated climate warming using infrared radiation instrument was conducted to measure CH4 fluxes from the wheat-maize rotation field with four treatments including conventional tillage with and without warming(CTW and CTN) and no-tillage with and without warming(NTW and NTN). Results showed that during wheat-maize growing period in 2013-2015 soil temperature at 10 cm soil depth was significantly elevated by 1.5℃ in CTW, and 1.4℃ in NTW, compared with CTN and NTN, respectively(P<0.05). The warming did not significantly affect soil moisture in these two tillage systems because of irrigation(P>0.05). Furthermore, soil CH4 fluxes did not show obvious seasonal changes among treatments. However, annual cumulative soil CH4 uptake showed significant differences among years. During wheat season in 2013-2014, the cumulative CH4 uptake in CTW and NTW increased by 35.8% and 108.8%, compared with those in CTN and NTN, respectively(P<0.01). During 2014-2015, however, it was reduced by 17.7% in CTW, compared with CTN(P<0.05). During maize season in two years, cumulative CH4 uptake was not significantly affected by experimental warming in two tillage systems(P>0.05). In addition, a significant positive relationship between soil microbial biomass carbon(MBC) and CH4 uptake was found. Decreased MBC content in CTW indicated that the limitation of climate warming projection on activity of soil organism may reduce the capability of soil CH4 sink in conventional tillage farmland of NCP. |
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