|
| Responses of priming effect of soil organic carbon to carbon component of rice straw addition |
| Received:April 15, 2024 |
| View Full Text View/Add Comment Download reader |
| KeyWord:rice;component of rice straw;priming effect;soil organic carbon;soil enzyme |
| Author Name | Affiliation | E-mail | | QIAO Yunfa | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | WANG Xiaoyi | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | TANG Yujie | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | | | MIAO Shujie | School of Ecology and Applied Meteorology, Nanjing University of Information Science and Technology, Nanjing 210044, China | miaoshujie@126.com |
|
| Hits: 1207 |
| Download times: 1064 |
| Abstract: |
| Straw return affects significantly priming effect（PE）of soil organic carbon（SOC）. However, the direction and magnitude of PE of SOC influenced by carbon components from rice straw are still unclear. The microcosm incubation experiment was carried out to reveal the mechanism of PE in response to different carbon components of rice straw labelled with 13C（hydrated carbon, fat-dissolved carbon, residuetotal and straw）added to fluvo-aquic soil in Huaibei plain. Results showed that the CO2 emitted rate was the highest with hydrated C addition across among different carbon components, and reached to 29.60 CO2-C mg·kg-1·d-1, while no significant variation across other three carbon components addition. Positive PE were observed in hydrated carbon and total straw addition treatments, which values were 11.16% and 13.39%, respectively. Fat-dissolved carbon and residues addition induced negative PE with -17.04% and -3.06%, The relationship analysis showed that soil enzyme activity was positive to total nitrogen（TN, r=0.768**）, and negative to C/N ratio（r=-0.776**）. There was positive relationship between PE and TN, enzyme activity, and negative to TC and TN of exogenous carbon component. Above together, the co-metabolism theory of straw carbon and SOC was used to explain the positive PE, and stoichiometry C/N ratio theory could explain the negative PE in the present study. |
|
|
|
