| 应用同步辐射光谱技术研究退耕草地土壤有机碳官能团变化 |
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| 引用本文： | 李 娟, 周卫军, 杨 宁, 魏甲彬. 去除氧化铁对古水稻土剖面有机质官能团红外光谱特征的影响[J]. 土壤通报, 2023, 54(6): 1299 − 1307. DOI: 10.19336/j.cnki.trtb.2022073002 |
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| 作者姓名： | 李娟 周卫军 杨宁 魏甲彬 |
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| 作者单位： | 1.湖南环境生物职业技术学院园林学院，湖南 衡阳 421005;2.湖南农业大学资源环境学院，湖南 长沙 410128 |
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| 基金项目： | 国家自然科学基金（41371288）、衡阳市科技计划项目（202150083609）和湖南环境生物职业技术学院青年基金（ZK2018-05）资助 |
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| 摘 要： | 目的 为了明确埋藏古水稻土与现代水稻土有机质官能团红外光谱特征及其变化规律，揭示氧化铁对不同环境条件、不同埋深有机质官能团光谱响应的影响。 方法 采用傅里叶红外光谱测定杉龙岗埋藏古水稻土与现代耕作水稻土原土、去除有机质土、去除氧化铁土的有机质官能团的光谱特征，对比分析土壤有机质官能团的差异及剖面分布特征。 结果 三种处理方式下有机质官能团红外光谱变化特征在同一土壤剖面的红外光谱曲线形态、特征吸收峰和吸收强度基本一致，尤其是与有机质官能团有关的几个典型吸收峰：2925 cm−1（脂族峰），2854 cm−1（脂族峰），1634 cm−1（芳香峰），1401 cm−1（脂族峰）。而去除有机质的差谱图在同一土壤剖面表现为：有机质官能团吸收强度均朝着强度更强的趋势变化，且去除氧化铁的差谱图中有机质官能团吸收强度变化更大。 结论 有机质官能团与含铁矿物之间存在密切联系，去除氧化铁更有利于观察有机质官能团红外光谱特征的变化，且这种变化在埋藏古水稻土中尤为明显，埋藏古水稻土有机质官能团结构稳定性表现为1634 cm−1（芳香峰） > 1401 cm−1（脂族峰） > 2925 cm−1（脂族峰） > 2854 cm−1（脂族峰）。剖面变化特征表现为随土层加深芳香碳增加而脂族碳减少。
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| 关 键 词： | 古水稻土 土壤有机质 氧化铁 有机质官能团 红外光谱特征 |
| 收稿时间： | 2022-07-30 |
| 修稿时间： | 2022-12-19 |
Novel electrochemical approach to assess the redox properties of humic substances |
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| LI Juan, ZHOU Wei-jun, YANG Ning, WEI Jia-bin. Effect of Iron Oxides Removal on the Infrared Spectral Characteristics of Soil Organic Matter Functional Groups in the Depth Profile of Ancient Paddy Soils[J]. Chinese Journal of Soil Science, 2023, 54(6): 1299 − 1307. DOI: 10.19336/j.cnki.trtb.2022073002 |
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| Authors: | LI Juan ZHOU Wei-jun YANG Ning WEI Jia-bin |
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| Affiliation: | 1.College of Landscape Architecture, Hunan Environmental-Biological Polytechnic College, Hengyang 421005, China;2.College of Resources and Environment, Hunan Agricultural University, Changsha 410128, China |
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| Abstract: | Objective This paper aimed to clarify the infrared spectral characteristics and their change patterns of soil organic matter functional groups in buried ancient and modern paddy soils, and to reveal the effect of iron oxide on the spectral response of organic matter functional groups at different environmental conditions and different buried depths. Method The spectral characteristics of original soil, the removal of organic matter soil, and the removal of iron oxide soil in buried ancient and modern paddy soils in Shanlonggang was analyzed by Fourier infrared spectroscopy, and the differences and the depth profile of soil organic matter functional groups were comparatively analyzed. Result The infrared spectral characteristics of curve shape, absorption peak and the intensity of absorption peak were unanimous in the same soil profile under the three treatments, especially the several typical absorption peaks related to organic functional groups: 2925 cm−1 (aliphatic peak), 2854 cm−1 (aliphatic peak), 1634 cm−1 (aromatic peak), 1401 cm−1 (aliphatic peak). The differential spectra of organic matter removal were manifested in the same soil profile as: the absorption peak intensity of organic functional groups changes towards stronger, and the absorption peak intensity of organic functional groups in the differential spectra of iron oxide removal is greater. Conclusion There is a close relationship between the functional groups of organic matter and iron-containing minerals. Removing iron oxide is more conducive to observing the changes in the infrared spectral characteristics for organic matter functional groups, and this change is particularly obvious in buried ancient rice soil. The structural stability of organic functional groups in the buried ancient paddy soil is followed as 1634 cm−1 (aliphatic peak) > 1401 cm−1 (aliphatic peak) > 2925 cm−1 (aromatic peak) > 2854 cm−1 (aliphatic peak). The profile variation shows that the deeper soil buried, the more aromatic carbon and the less aliphatic carbon. |
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| Keywords: | Ancient paddy soil Soil organic matter Iron oxide Organic matter functional groups Infrared spectral characteristics |
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