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| 稻田入土生物质炭自然陈化过程理化特性变化规律 |
| Changes of physical and chemical characteristics of biochar in paddy field during natural aging |
| 投稿时间：2021-07-05 |
| DOI：10.13254/j.jare.2021.0410 |
| 中文关键词: 生物质炭，稻田土壤，理化特性，评估方法，碳汇 |
| 英文关键词: biochar, paddy soil, physicochemical properties, evaluation method, carbon sequestration |
| 基金项目:国家自然科学基金项目（42077032，41571241）；国家科技支撑计划项目（2015BAC02B01） |
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| 中文摘要: |
| 为探究生物质炭入土后其长期理化特性变化，以水稻秸秆生物质炭为试验材料，通过分析长期定位试验田中的入土生物质炭样品，探究了稻田土壤中生物质炭的理化特性变化规律。结果表明，入土生物质炭颗粒随时间推移经历持续性物理破碎，平均孔径显著降低，入土11年后，生物质炭比表面积从初始的55.0 m2·g-1增大到259.0 m2·g-1，氢与碳的摩尔比从最初的0.423提升至0.568，不饱和度显著提升。入土生物质炭C=O（1 600~1 630 cm-1）和C—O—C（1 080 cm-1）的骨架振动强度和芳香族C—H（790 cm-1）的平面振动均增强，其含氧官能团的类型和含量呈现明显增加的趋势。与此同时，入土生物质炭的可热降解组分占比不断提高，热稳定性逐渐降低。研究表明，与实验室老化模拟试验结果明显不同，受诸多外力作用和环境因素的影响，稻田中入土生物质炭的理化特性发生了更显著的变化，稳定性随着时间的推移逐年降低。因此，为精准科学评估稻田生态系统生物质炭化还田的固碳减排效应，开展入土生物质炭长期稳定性分析测试与相关评价模型研究十分必要。 |
| 英文摘要: |
| The return of biochar to the field is an important measure for soil carbon sequestration. The biochar changes in the soil determine its carbon sequestration effect. However, long-term changes in biochar after returning to the soil have rarely been reported. In this study, biochar prepared using rice straw was used as the test material. The change law of the biochar in the paddy soil was explored by analyzing the soil biochar in the long-term location test field. Results showed that biochar particles in the soil experienced continuous physical fragmentation over time, the average pore diameter decreased, and the specific surface area increased from 55.0 m2·g-1 to 259.0 m2·g-1. Eleven years after returning to the field, the hydrogen-corbon molar ratio of biochar increased from 0.423 to 0.568, reflecting an increase in unsaturation. After the biochar was returned to the field, the frame vibration intensity of C=O(1 600~1 630 cm-1), C-O-C(1 080 cm-1), and the plane vibration of aromatic C-H(790 cm-1) were enhanced. Meanwhile, the type and content of functional groups showed an upward trend. At the same time, the proportion of thermally degradable components of buried biochar continues to increase, and the thermal stability of biochar gradually decreased. Along with the influence of environmental factors, biochar returning to the field has undergone more significant changes, and its stability has decreased yearly, significantly different from the results of laboratory aging. Therefore, to accurately evaluate the carbon sequestration and emission reduction effects of biochar, it is particularly urgent to carry out long-term stability analysis and testing of the biochar returning to the field. |
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