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| Effects of combined application of biochar and arbuscular mycorrhizal fungi on soil organic carbon content and stability |
| Received:January 25, 2025 |
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| KeyWord:：biochar;arbuscular mycorrhizal fungi;mineral-associated organic carbon;Fe-bound organic carbon;paddy field soil |
| Author Name | Affiliation | E-mail | | HAN Shuang | 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China | | | LIANG Yuan | 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China | liangyuan@usts.edu.cn | | ZHANG Deshan | 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China | | | WANG Yan | 1. School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China | |
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| Abstract: |
| In order to explore the sequestration effect and stability mechanism of biochar and arbuscular mycorrhizal fungi（AMF）on soil organic carbon in paddy field, this paper explores the effects of blank treatment（CK）, biochar addition alone（GBC）, arbuscular mycorrhizal fungi inoculation alone（GAMF）, and their combination（GBA）on soil organic carbon（SOC）composition, stability, and iron-carbon binding mechanism of SOC under alternating dry-wet conditions through indoor incubation experiments. The results indicate that G BA treatment significantly increased SOC, mineral-associated organic carbon（MAOC）, and Fe-bound organic carbon（Fe-OC）. Compared to CK, GBA increased SOC by 504.23% and MAOC by 1 306.80%. Compared to CK, GBA significantly reduced particulate organic carbon（POC）/SOC by 87.10%, but MAOC/SOC increased by 134.56%, reaching 92.17%, suggesting that the combination of biochar and AMF promoted the conversion of POC to stable MAOC. FTIR analysis revealed that the aromatic carbon in GBA increased by 30.57% compared to CK. The content of Fe-OC in GBA increased by 1 397.51% compared to CK, and the OC/Fe molar ratio（2.72）indicated that the production of FeOC in CBA was primarily promoted through adsorption and co-precipitation mechanisms. XPS results further revealed that GBA had the highest proportion of Fe3+（29.61%）, and its high charge density enhanced the complexation of minerals and organic carbon, thereby improving soil carbon stability. Correlation analysis showed that MAOC and Fe-OC were significantly positively correlated with AMF colonization rate（P<0.05）, and biochar addition increased the AMF colonization rate, synergistically promoting carbon-iron binding. The results showed that the combination of biochar and AMF significantly enhances the content and stability of SOC in paddy soils. |
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