光谱学与光谱分析, 2018, 38 (4): 1298, 网络出版: 2018-06-12  

棕壤与褐土刺槐林下土壤腐殖质组分的傅里叶变换红外光谱分析

Fourier Transform Infrared Spectroscopy Analysis of Humic Acids from Brown and Cinnamon Soils under Robinia pseudoacacia Forest
作者单位
1 临沂大学农林科学学院, 山东 临沂 276005
2 临沂大学药学院, 山东 临沂 276005
3 临沂大学资源与环境学院, 山东 临沂 276005
4 中国科学院沈阳应用生态研究所, 辽宁 沈阳 110016
摘要
森林土壤富含不同组分和功能的有机碳。 该研究以棕壤和褐土45年林龄的刺槐林下表层及底层土壤为对象, 研究其林下土壤腐殖酸组分在不同土壤类型和不同土层间的差异和变换。 褐土和棕壤表层及底层土壤分别定义为CO和CA, BO和BA。 应用傅里叶变换红外光谱对土壤腐殖质组分的富里酸(FA)、 胡敏酸(HA)和胡敏素(HM)进行了分析。 结果表明富里酸主要吸收峰为3 400 cm-1处的碳水化合物中—OH形成的氢键伸缩振动, 1 655 cm-1处的芳香环CC伸缩振动, 1 110 cm-1处的脂族C—OH伸缩振动。 与富里酸相比, 胡敏酸所含官能团与其相似, 差异在于其吸收峰强度较弱。 胡敏素在1 110 cm-1处的脂族C—OH伸缩振动和1 030 cm-1处多糖或类多糖物质的C—O伸缩振动较胡敏酸此处的峰吸收强度强。 根据分析, 表层土壤腐殖质官能团结构较底层土壤多且吸收强度强。 另外, 富里酸不同物质官能团数量及强度受土壤类型和土壤深度的影响较胡敏酸和胡敏素小。 根据不同吸收峰对比分析发现, 富里酸组分的芳化程度较强, 而胡敏酸和胡敏素的芳化作用仅表层土壤程度较强。 不同土壤类型胡敏酸组分分析表明, 棕壤表层土壤芳族和脂肪族物质吸收强度明显高于褐土。 综上, 土壤类型和土层显著影响45年林龄的刺槐林下土壤腐殖质组分, 尤其是胡敏酸和胡敏素组分。
Abstract
Forest soil contains lots of carbon, which presented in different fractions with various functions. This study collected surface and subsurface soil samples from brown soil and cinnamon soil under 45 years old Robinia pseudoacacia forest. Difference within soil humic substances under long-term forest, the influence from soil type and depth were studied in this paper. Surface and subsurface soil samples collected from cinnamon and brown soil were defined as CO and CA, BO and BA, respectively. Humic substances were separated as fulvic acid (FA), humic acid (HA) and humin (HM) and analyzed by Fourier transform infrared spectroscopy (FT-IR). Results showed that FA contained mainly stretching vibration of carbohydrate H-bonded OH at 3 400 cm-1, aromatic CC at 1 655 cm-1 and C—OH stretching of aliphatic at 1 110 cm-1. Compared with FA, HA has weaker peaks at similar wave numbers than those in FA. HM fraction has stronger peaks at 1 110 and 1 030 cm-1 than HA, which assigned as C—OH stretching of aliphatic OH and C—O stretching of polysaccharide or polysaccharide-like compounds. Results also showed that more peaks were collected in surface soils and the absorption intensity are also stronger than those in subsurface soils. In addition, absorption bands richness and intensity of FA fraction suffered less influence from soil type and depth than those in HA and HM fractions. Through analysis of absorption bands, FA fractions had strong aromatization, while aromatization of HA and HM were only stronger under surface soil. The aromatic and aliphatic structures in HA fractions under BO soil were much stronger than those in cinnamon soil. Thus, we conclude that humic substances in 45 years old Robinia pseudoacacia forest soils is influenced by soil depth and soil type, especially in HA and HM fractions.

张广娜, 林祥杰, 李蕴梅, 徐树建, 张玉兰. 棕壤与褐土刺槐林下土壤腐殖质组分的傅里叶变换红外光谱分析[J]. 光谱学与光谱分析, 2018, 38(4): 1298. ZHANG Guang-na, LIN Xiang-jie, LI Yun-mei, XU Shu-jian, ZHANG Yu-lan. Fourier Transform Infrared Spectroscopy Analysis of Humic Acids from Brown and Cinnamon Soils under Robinia pseudoacacia Forest[J]. Spectroscopy and Spectral Analysis, 2018, 38(4): 1298.

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