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| Impacts of wheat straw return on soil labile organic carbon fractions and bacterial diversity in rice rhizosphere |
| Received:February 17, 2025 |
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| KeyWord:straw return;labile organic carbon fraction;bacterial community diversity;rhizosphere |
| Author Name | Affiliation | E-mail | | CHENG Yu | School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
Key Laboratory of Agro-Environment in Downstream of Yangtze Plain of Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | CHEN Pei | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain of Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
School of Water Conservancy Environment, Jinan University, Jinan 250022, China | | | CHEN Rui | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain of Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | WANG Ning | School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China
Key Laboratory of Agro-Environment in Downstream of Yangtze Plain of Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China
College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China | wang.ning4113@163.com | | YU Jianguang | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain of Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | | | XUE Lihong | Key Laboratory of Agro-Environment in Downstream of Yangtze Plain of Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Environment, Jiangsu Academy of Agricultural Sciences, Nanjing 210014, China | |
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| Abstract: |
| Straw return is a prevalent agricultural practice, yet research on soil characteristics influenced by the interaction between straw and rice roots in paddy soils remains scarce. This study examined two types of rice-wheat rotation soils—high sandy soil from Taizhou, Jiangsu, and yellow clay soil from Yixing, Jiangsu—through greenhouse pot experiments to assess the effects of wheat straw incorporation on soil organic carbon composition and bacterial community diversity in both rhizosphere and bulk during the rice jointing stage. The findings indicated that wheat straw incorporation, compared to the control, increased organic carbon（OC）content in the bulk of high sandy soil and yellow clay soil by 11.4% and 19.0%, respectively, and enhanced dissolved organic carbon（DOC）content by 16.7% and 38.6%, respectively, as well as particulate organic carbon（POC）content by 6.97% and 32.9%, respectively. Furthermore, in rhizosphere soils compared to bulk soils, the OC content increased by 7.48% and 19.0%, the DOC content rose by 68.8% and 28.1%, and the POC content grew by 21.7% and 51.9% for high sandy soil and yellow clay soil, respectively. Notably, the increases in DOC and POC content were more pronounced in rhizosphere soils than in bulk soils for both soil types. Additionally, straw incorporation significantly elevated the easily oxidizable carbon（EOC）content in the rhizosphere and bulk of yellow clay soil by 38.5% and 78.8%, respectively, while significantly reducing microbial biomass carbon（MBC）content in the rhizosphere soils of both soil types. High-throughput sequencing analysis revealed that wheat straw incorporation significantly decreased the observed species and Shannon index of bacteria in the bulk soil and rhizosphere of sandy soil, yet significantly increased these metrics in the bulk of yellow clay soil. Straw incorporation also markedly altered the bacterial community composition in both rhizosphere and bulk soil of the two soil types, significantly increasing the relative abundance of Hydrogenispora in bulk soil and Clostridium sensu stricto 8 in the rhizosphere. Moreover, bacterial community changes in the rice rhizosphere were more pronounced than those in the bulk soil following wheat straw incorporation, with OC, EOC, and POC identified as key factors regulating these changes. In summary, straw incorporation significantly increases the content of active carbon in rice rhizosphere soil and alters the structure of rhizosphere bacterial communities. Moreover, active organic carbon in the soil is a key factor driving the changes in rhizosphere bacterial communities. |
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