Effects of Straw Maize on the Bacterial Community and Carbon Stability at Different Soil Depths

Wei Fan, Jingchao Yuan, Jinggui Wu () and Hongguang Cai ()
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Wei Fan: Collage of Resources and Environment Sciences, Jilin Agricultural University, Changchun 130118, China
Jingchao Yuan: Institute of Agricultural Environment and Resources, Jilin Academy of Agricultural Sciences, Changchun 130033, China
Jinggui Wu: Collage of Resources and Environment Sciences, Jilin Agricultural University, Changchun 130118, China
Hongguang Cai: Institute of Agricultural Environment and Resources, Jilin Academy of Agricultural Sciences, Changchun 130033, China

Agriculture, 2023, vol. 13, issue 7, 1-15

Abstract: In order to test the short-term effects of straw amendment on soil organic C (SOC) stabilization, SOC protection mechanisms, and soil bacterial community, we examined which bacterial taxonomic groups were associated with protected C fractions via different soil depths. We conducted a 5-year field experiment including a total of four treatments: S0 (no straw amendment), S1 (0–20 cm straw-amended soil), S2 (0–40 cm straw-amended soil) and S3 (0–60 cm straw-amended soil). The core method was used for soil sampling, and 180 soil samples was collected. Our results showed that straw amendment significantly increased bulk soil C content, enhanced the constituents of physically separated fractions and their OC contents, and changed the soil bacterial community composition at different soil depths. SOC was more accelerated in macroaggregate-derived unprotected and microaggregate-derived physically protected fractions at soil depths of 0–20 cm. Physically protected and physico-biochemically protected fractions were the major C protection mechanisms at soil depths of 20–40 cm and 40–60 cm soil depths. Our study also provides evidence that straw amendment significantly increases the bacterial phyla abundance of Proteobacteria and Bacteroidetes at each soil depth. Moreover, straw amendment enhanced the relative abundances of Gemmatimonadetes and Nitrospirae at soil depths of 40–60 cm and have a positive correlation with physically and physico-biochemically protected C pools. These results indicate that straw amendment can regulate C sequestration processes by enhancing SOC physical protection and modulating bacterial community, especially in the deep soil. In addition, straw amendment in subsoil (0–40 cm or 0–60 cm) is more beneficial for C storage and stabilization.

Keywords: straw amendment; protected C; soil depths; soil bacterial community (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: 2023
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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