澧阳平原古水稻土有机质红外光谱特征  

Infrared Spectral Characteristics of Organic Matter in Ancient Paddy Soils in Liyang Plain,Hunan,China

作　　者：刘沛[1] 周卫军[1] 李娟[1] 郭子川[1] 谭洁[1] 樊腾芳 陈恋[1] 曹胜[1] 

机构地区：[1]湖南农业大学资源环境学院,长沙410128

出　　处：《土壤学报》2016年第4期901-908,共8页Acta Pedologica Sinica

基　　金：国家自然科学基金项目(41371228)资助~~

摘　　要：澧阳平原杉龙岗古水稻土遗址剖面中不同耕作年限、不同环境条件、不同深埋的有机质的积累与迁移变化明显。以澧阳平原杉龙岗古水稻土遗址为研究对象,采用溴化钾压片法对剖面中古水稻土和现代耕作水稻土进行红外光谱测定,分析土壤中有机质的官能基团以及各基团的结构特征。结果表明,古水稻土官能基团的振动主要集中在卤素化合物和无机化合物,有机质对古水稻土官能团影响很大,其中,古水稻土中波数1 882 cm-1（烯烃碳）在去有机质后吸收峰弱化;古水稻土中波数为1 631～470 cm-1段,逐渐形成苯环、烯烃化合物且芳构化程度增加,卤素和无机化合物的结合力增强。由一阶导数可知,古水稻土与现代耕作水稻土相差不大,在去有机质后,波峰均被弱化且FD值峰值均小于去有机质前FD值。【Objective】So far little has been reported on accumulation and transformation processes of soil organic matter in ancient paddy soil which has been buried or covered under paddy conditions as a result of environmental evolution,geological alteration or natural disasters. The organic matter in ancient paddy soils that have long been under obturation has already altered in nature and composition. Infrared spectrum is an important means that can be used to characterize chemical structure and physical properties of polymers. As organic matter in the soil absorbs the different wavelength spectra selectively,a large amount of information about the nature,reaction characteristics and structure of oxygen-containing functional groups can be extracted from infrared spectrograms for identification. Since the organic matter in the buried ancient paddy soil is very complex in structure,how to analyze various functional groups in organic matter is a significant problem that needs to be solved in the present study. 【Method】The soil organic matter in the ancient paddy soil profiles at Sanlonggang of the Liyang Plain,demonstrated clean traits of accumulation and transformation as affected by cultivation age,environmental condition,and burial depth. So soil samples,were collected from the ancient paddy soil layers and the modern paddy soil layer of the profiles for infrared spectral analysis using the potassium bromide pressed disc method,to identify functional groups in the organic matter therein and characterize structures of the groups separately,in an attempt to provide some theoretical and practical bases for revealing structural characteristics and evolution processes of the organic matter in the buried ancient paddy soil. 【Result】Results show that the organic matter in the ancient paddy soil has become an inherent component of the soil under long-term burial and carbonization and hard to get leached,thus leading to accumulation of the matter relative to the modern paddy soil. The vibrations in the infrared spect

关 键 词：澧阳平原 古水稻土 有机质 光谱特征 

分 类 号：S153.621[农业科学—土壤学]