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Soil Bacteria Mediate Soil Organic Carbon Sequestration under Different Tillage and Straw Management in Rice-Wheat Cropping Systems

Author

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  • Lijin Guo

    (International Magnesium Institute, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
    Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, College of Forestry, Hainan University, Ministry of Education, Haikou 570228, China
    These authors contributed equally to this work.)

  • Jie Shi

    (State Key Laboratory of Hydraulic Engineering Simulation and Safety, School of Civil Engineering, Tianjin University, 135 Yaguan Road, Jinnan District, Tianjin 300350, China
    These authors contributed equally to this work.)

  • Wei Lin

    (College of Forestry, Fujian Agriculture and Forestry University, Fuzhou 350002, China)

  • Jincheng Liang

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, College of Forestry, Hainan University, Ministry of Education, Haikou 570228, China)

  • Zhenhua Lu

    (Kaifeng Academy of Agriculture and Forestry, Kaifeng 475004, China)

  • Xuexiao Tang

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, College of Forestry, Hainan University, Ministry of Education, Haikou 570228, China)

  • Yue Liu

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, College of Forestry, Hainan University, Ministry of Education, Haikou 570228, China)

  • Purui Wu

    (Key Laboratory of Genetics and Germplasm Innovation of Tropical Special Forest Trees and Ornamental Plants, College of Forestry, Hainan University, Ministry of Education, Haikou 570228, China)

  • Chengfang Li

    (MOA Key Laboratory of Crop Ecophysiology and Farming System in the Middle Reaches of the Yangtze River, College of Plant Science & Technology, Huazhong Agricultural University, Wuhan 430070, China)

Abstract

Soil organic carbon (SOC) largely influences soil quality and sustainability. The effects of no-till (NT) and crop straw return practices (SR) on soil organic carbon sequestration have been well documented. However, the mechanism of soil bacterial community in regulating soil organic carbon under NT and SR remains unclear. In this study, we investigated the impacts of tillage (conventional tillage (CT) and NT) and crop straw return practices (crop straw removal (NS) and SR) on topsoil layer (0–5 cm) bacterial community, CH 4 and CO 2 emissions and SOC fractions in rice-wheat cropping system. Overall, in the wheat season following the annual rice-wheat rotation in two cycles, NT significantly increased SOC by 4.4% for 1–2 mm aggregates in the 0–5 cm soil layer, but decreased CO 2 emissions by 7.4%. Compared with NS, SR notably increased the contents of SOC in the topsoil layer by 6.5% and in macro-aggregate by 17.4% in 0–5 cm soil layer, and promoted CH 4 emissions (by 22.3%) and CO 2 emissions (by 22.4%). The combination of NT and NS resulted in relatively high SOC and low CH 4 emissions along with high bacterial community abundance. The most abundant genus under different treatments was Gp6 , which significant impacted SOC and MBC. Bacterial communities like Subdivision3 had the most impact on CH 4 emissions. Structural equation modeling further suggested that the soil bacterial community indirectly mediated the SOC through balancing SOC in 1–2 mm aggregates and CH 4 emissions. This study provides a new idea to reveal the mechanism of short-term tillage and straw return on SOC.

Suggested Citation

  • Lijin Guo & Jie Shi & Wei Lin & Jincheng Liang & Zhenhua Lu & Xuexiao Tang & Yue Liu & Purui Wu & Chengfang Li, 2022. "Soil Bacteria Mediate Soil Organic Carbon Sequestration under Different Tillage and Straw Management in Rice-Wheat Cropping Systems," Agriculture, MDPI, vol. 12(10), pages 1-17, September.
    • Handle: RePEc:gam:jagris:v:12:y:2022:i:10:p:1552-:d:925569
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    References listed on IDEAS

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    1. Mingzheng Duan & Yanyan Long & Hongzeng Fan & Li Ma & Shijian Han & Suli Li & Benhui Wei & Lingqiang Wang, 2022. "Fenlong-Ridging Promotes Microbial Activity in Sugarcane: A Soil and Root Metabarcoding Survey," Agriculture, MDPI, vol. 12(2), pages 1-14, February.
    2. Katarína Ondreičková & Michaela Piliarová & Rastislav Bušo & Roman Hašana & Ľudovít Schreiber & Jozef Gubiš & Ján Kraic, 2018. "The Structure and Diversity of Bacterial Communities in Differently Managed Soils Studied by Molecular Fingerprinting Methods," Sustainability, MDPI, vol. 10(4), pages 1-17, April.
    3. Qi-Xia Wu & Bin Du & Shuo-Chen Jiang & Hai-Wei Zhang & Jian-Qiang Zhu, 2022. "Side Deep Fertilizing of Machine-Transplanted Rice to Guarantee Rice Yield in Conservation Tillage," Agriculture, MDPI, vol. 12(4), pages 1-12, April.
    4. Mengqi Sun & Baoyu Chen & Hongjun Wang & Nan Wang & Taigang Ma & Yingshun Cui & Tianhao Luan & Seongjun Chun & Chunguang Liu & Lichun Wang, 2021. "Microbial Interactions and Roles in Soil Fertility in Seasonal Freeze-Thaw Periods under Different Straw Returning Strategies," Agriculture, MDPI, vol. 11(8), pages 1-15, August.
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