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| Impacts of straw incorporation with nitrogen-fixing cyanobacteria and goethite on greenhouse gas emissions from paddy soils in the black soil region |
| Received:November 25, 2024 |
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| KeyWord:nitrogen-fixing cyanobacteria;goethite;straw return;greenhouse gases;functional genes |
| Author Name | Affiliation | E-mail | | FAN Congcong | School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China | | | WU Fan | School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China | | | ZHAO Lixia | Nanjing Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | | | LIANG Yuting | Nanjing Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | | | XIAO Xian | School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China | | | CAI Hao | School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China | | | ZHAO Yuan | School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, China | zhaoyuan@cczu.edu.cn | | WANG Xiaoyue | Nanjing Institute of Soil Science, Chinese Academy of Sciences, Nanjing 211135, China | wangxy@issas.ac.cn |
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| Abstract: |
| To investigate the effects of using goethite as a mitigation material on greenhouse gas emissions from paddy soil under the coapplication of nitrogen-fixing cyanobacteria and rice straw, as well as its microbial mechanisms, a 100-day waterlogged incubation experiment was conducted at a constant temperature of 20 ℃ using albic paddy soil from the black soil region in northeast China. Four treatments were established：straw（S）, straw + goethite（SFe）, straw + nitrogen-fixing cyanobacteria（SB）, and straw + goethite+ nitrogen-fixing cyanobacteria（SFeB）. Greenhouse gas emissions, soil DOC, NO3--N, NH4+-N, Fe2+, and the abundance of functional genes involved in carbon and nitrogen transformation were analyzed. Compared to the S treatment, the SB treatment reduced cumulative CO2 emissions by 11.58%, while increasing CH4 and N2O emissions by 54.47% and 84.05%, respectively, ultimately leading in a 57.69% rise in global warming potential（GWP）. Compared to the SB treatment, the SFeB treatment reduced cumulative emissions of CH4 and N2O by 10.31% and 38.79%, respectively, while decreasing the GWP by 13.69%. Moreover, compared to the S treatment, the SFe, SB, and SFeB treatments significantly altered soil chemical properties and the abundance of microbial communities associated with greenhouse gas emissions. Based on correlation analysis and random forest modeling, soil DOC, NO -3-N, NH4+-N, and the abundance of mcrA, and nirS genes were identified as key drivers of greenhouse gas emissions. This study revealed that compared to straw addition alone, the co-application of straw and nitrogen -fixing cyanobacteria significantly enhanced greenhouse gas emissions in paddy soils in the black soil regions. However, the addition of goethite effectively suppressed CH4 and N2O emissions induced by straw-cyanobacteria co-application in paddy soils, thereby mitigating the GWP. |
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