| 樊聪聪,吴帆,赵丽霞,梁玉婷,肖娴,蔡浩,赵远,王晓玥.秸秆配施蓝藻和针铁矿对黑土区稻田土壤温室气体排放的影响[J].农业环境科学学报,2025,44(12):3282-3292. |
| 秸秆配施蓝藻和针铁矿对黑土区稻田土壤温室气体排放的影响 |
| Impacts of straw incorporation with nitrogen-fixing cyanobacteria and goethite on greenhouse gas emissions from paddy soils in the black soil region |
| 投稿时间：2024-11-25 |
| DOI：10.11654/jaes.2024-1027 |
| 中文关键词: 固氮蓝藻 针铁矿 秸秆还田 温室气体 功能基因 |
| 英文关键词: nitrogen-fixing cyanobacteria goethite straw return greenhouse gases functional genes |
| 基金项目:中国科学院战略性先导科技专项（XDA28030102）；国家自然科学基金项目（U24A20632）；江苏省农业科技自主创新项目（CX（24）3117）；南京土壤所自主部署项目（ISSAS2401）；江苏省研究生科研与实践创新计划项目（SJCX24_1647）；常州市科技支撑计划项目（CE20235036）；常州市科技支撑计划项目（CE20232021） |
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| 中文摘要: |
| 为探明使用针铁矿作为减排材料对蓝藻与秸秆配施下稻田土壤温室气体排放的影响及其微生物学机制，采集东北黑土区白浆型水稻土，开展100 d、温度为20 ℃的室内淹水培养实验，设置4个处理：秸秆（S）、秸秆+针铁矿（SFe）、秸秆+蓝藻（SB）和秸秆+针铁矿+蓝藻（SFeB）。分析各处理中温室气体排放量、土壤可溶性有机碳（DOC）、NO3--N、NH4+-N、Fe2+，以及碳氮转化功能基因的丰度。结果表明：与S处理相比，SB处理虽然使CO2累积排放量降低了11.58%，但使CH4和N2O，累积排放量分别提高了54.47%和 84.05%，全球增温潜势（GWP）增加了 57.69%。与 SB 处理相比，SFeB 处理使 CH4和 N2O 的累积排放量分别降低了 10.31% 和38.79%，GWP降低了13.69%。此外，与S处理相比，SFe、SB和SFeB处理均显著改变了土壤理化性质以及与温室气体排放相关的微生物群落丰度。通过相关性和随机森林模型分析，确定DOC、NO3--N、NH4+-N以及mcrA与nirS功能基因丰度是温室气体排放的主要因子。研究表明，与单独添加秸秆相比，秸秆配施蓝藻会促进黑土区水稻土温室气体的排放，通过添加针铁矿可以有效抑制秸秆配施蓝藻的水稻土中CH4和N2O的排放，从而缓解GWP的加剧。 |
| 英文摘要: |
| 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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