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| Characteristics of soil organic carbon mineralization in the soil of maize fields with different soil fertility |
| Received:August 13, 2018 |
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| KeyWord:soil fertility;soil organic carbon;organic carbon mineralization;active organic carbon |
| Author Name | Affiliation | E-mail | | WANG Yong-hui | College of Life Science and Technology, Inner Mongolia Normal University, Hohhot 010022, China
Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | YANG Dian-lin | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | HONG Yu | College of Life Science and Technology, Inner Mongolia Normal University, Hohhot 010022, China | hongyu@imnu.edu.cn | | ZHAO Jian-ning | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | XUAN Qing-xia | Qihe Agricultural Bureau in Shandong Province, Qihe 251100, China | | | HUO Li-li | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | TAN Bing-chang | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | XIU Wei-ming | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | | | WANG Li-li | Agro-Environmental Protection Institute, Ministry of Agriculture and Rural Affairs, Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture and Rural Affairs/Tianjin Key Laboratory of Agro-Environment and Agro-Product Safety, Tianjin 300191, China | lili0229ok@126.com |
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| Abstract: |
| In order to explore the mineralization characteristics of soil organic carbon, we carried out soil organic carbon mineralization culture experiments lasting 196 days using the soil from 0~20 cm and 20~40 cm depths with different fertility (high, medium, and low soil fertility). The results showed that the soil organic carbon mineralization rate varied over time and exhibited a consistent trend in maize fields with different soil fertility (the mineralization rate first increased, then decreased, and finally stabilized). With the decrease in soil fertility, the mineralization rate of soil organic carbon gradually decreased. At the end of the culture experiment, there were significant differences in the cumulative mineralization amount of soil organic carbon between the 0~20 cm and 20~40 cm deep soils with the same soil fertility level (P<0.05). Compared to the other soil fertility levels, the soil organic carbon in the low fertility soil was the most unstable, with the smallest soil carbon pool. Compared to the 0~20 cm deep soil, both the organic carbon mineralization rate and the cumulative mineralization amount of soil organic carbon of the 20~40 cm deep soil were lower for the same soil fertility level, which indicated that the surface soil stability was poor, and inhibited the fixation of organic carbon. Accompanied by the process of soil organic carbon mineralization, the soil microbial biomass carbon (MBC) and dissolved organic carbon (DOC) contents were lower than the initial stage. The mineralization potential (Cp) of soil organic carbon was positively correlated with the soil organic carbon, total nitrogen, ammonium nitrogen, nitrate nitrogen, MBC, and DOC contents. Soil organic carbon mineralization is an important part of the carbon cycle in the terrestrial ecosystem, and the stability of soil organic carbon at different soil depths likely would be affected when the soil fertility varies. This study provides data support for understanding the dynamic trend of soil organic carbon in soils with different fertility levels and the benefits of carbon sequestration and emission reduction in maize fields. |
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