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| Relationship between functional groups of soil dissolved organic carbon and CO2 emissions with crop residues incorporation to soil |
| Received:May 25, 2017 |
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| KeyWord:crop residue;dissolved organic carbon(DOC);functional group characteristics;CO2 |
| Author Name | Affiliation | E-mail | | LI Bin-bin | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | WU Lan-fang | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | wulf@igsnrr.ac.cn | | XU Yan-yan | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | QIN Yue | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | |
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| Abstract: |
| Dissolved organic carbon is an important component of soil organic carbon. Changes in its content and chemical composition will have a significant effect on the emission of greenhouse gases. The purpose of this study was to explore the change of soil DOC functional group, as well as its effects on CO2 emission. We carried out a plot experiment in the field to investigate the soil DOC concent, DOC functional groups and CO2 emissions under with and without crop residue treatments. The results showed that crop residues incorporation into soil significantly increased soil DOC content. DOC was composed of amide and aromatic compounds, which consisted of a carbon-carbon double bond, an amido bond, and a benzene ring. Returning crop residue to the soil increased the ratio of the contents of the amido bond and benzene ring. In addition, crop residues incorporation significantly increased the soil CO2 emission. The changes of the DOC content, DOC functional groups, and CO2 emission were similar during the four consecutive wheat growing seasons. Based on the correlation analysis, we found both the soil DOC content and its functional group strongly correlated to the CO2 emissions.The high CO2 emissions were observed in the soil with high contents of amide and aromatic compounds. |
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