Journal of Guangxi Normal University(Natural Science Edition) ›› 2021, Vol. 39 ›› Issue (4): 158-169.doi: 10.16088/j.issn.1001-6600.2020092402

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Effect of Improved Calcium Peroxide on Organic Carbon Mineralization in Gleyed Paddy Soil

HU Lening1,2, LI Shuangli1,2, LI Yang3, WEI Yizhuang1,2, ZHOU Jinling4, SU Yirong4, DENG Hua1,2*   

  1. 1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection (Guangxi Normal University), Ministry of Education, Guilin Guangxi 541006, China;
    2. College of Environment and Resources, Guangxi Normal University, Guilin Guangxi 541006, China;
    3. Guangxi Zhuang Autonomous Region Academy of Environmental Protection Science, Nanning Guangxi 530022, China;
    4. Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha Hunan 410125, China
  • Revised:2020-12-15 Online:2021-07-25 Published:2021-07-23

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Abstract: In order to explore the role of modified calcium peroxide (CaO2) in the process of organic carbon mineralization in gleyed paddy soil, CaO2 was selected as raw material and coated with ethyl cellulose dissolved in ethanol to prepare granulated calcium peroxide (GAO), set GAO and calcium oxide (CAO, containing 95.0% of CaO mass fraction), calcium peroxide (PAO, containing 75% of CaO2 mass fraction) 3 substances each with 3 different oxygen content concentrations (low concentration 0.011 g/kg, medium concentration 0.111 g/kg and high concentration 1.111 g/kg). At the same time, no substance was added as a blank control (CK), and the method of indoor cultivation was used to study and analyze its effect on the organic carbon mineralization of cultivable paddy soil, the influence of dissolved organic carbon (DOC) and microbial biomass carbon (MBC). The results showed that under the condition of high oxygen concentration, after the incubation period, PAO and GAO inhibited the CO2 emission from the cultivating paddy soil compared with CK and CAO. The cumulative CO2 emission from the soil treated with PAO were reduced by 50.86% and 46.33% compared with CK and CAO treatments, respectively, the cumulative CO2 emissions of soil treated with GAO were reduced by 22.49% and 15.35% compared with CK and CAO treatments, respectively. Compared with CK, the addition of CAO, PAO, and GAO promoted CH4 emissions from cultivable paddy soil. Its cumulative CH4 emissions are 2.07 times, 1.22 times, and 1.10 times that of CK treatment, respectively. Compared with CK treatment, the addition of medium and high concentrations of oxidants significantly increased the content of MBC and DOC in cultivable paddy soil, and the addition of GAO delayed the peak period of soil MBC content, indicating that GAO is due to its special coating effectively reduces the oxygen release rate of the oxidant, and can still effectively release oxygen in the later stage of the culture. This study shows that the improved oxidant GAO has a good application potential in improving the microbial activity of cultivable paddy soil and promoting the turnover of organic carbon.

Key words: gleyed paddy soil, oxidant, greenhouse gases, organic carbon, mineralization, microbial biomass carbon

CLC Number: 

  • S153.6
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