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

Lijin Guo, Jie Shi, Wei Lin, Jincheng Liang, Zhenhua Lu, Xuexiao Tang, Yue Liu, Purui Wu and Chengfang Li ()
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Lijin Guo: International Magnesium Institute, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
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
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

Agriculture, 2022, vol. 12, issue 10, 1-17

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.

Keywords: no-till; straw return; soil organic carbon fractions; soil aggregate; bacterial diversity (search for similar items in EconPapers)
JEL-codes: Q1 Q10 Q11 Q12 Q13 Q14 Q15 Q16 Q17 Q18 (search for similar items in EconPapers)
Date: 2022
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