澧阳平原古水稻土有机质红外光谱特征

发布时间：2018-01-03 20:12

本文关键词：澧阳平原古水稻土有机质红外光谱特征　出处：《土壤学报》2016年04期 　论文类型：期刊论文

【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。
[Abstract]:Different cultivation age Liyang plain Shan Longgang ruins of ancient paddy soil profile in different environmental conditions, accumulation and migration changes of organic matter in different depth is obvious. In Liyang plain Shan Longgang ancient paddy soil site as the research object, the middle section of paddy soil and farming paddy soil were analyzed by IR using potassium bromide compression method, analysis of soil organic matter in functional groups and structural characteristics of each group. The results show that the vibration of ancient paddy soil functional groups mainly concentrated in halogen compounds and inorganic compounds, organic matter, influence on ancient paddy soil groups in ancient paddy soil in the wave number of 1882 cm-1 (olefin carbon) absorption peak in organic matter after weakening; wavenumber in ancient paddy soil was 1 631~470 cm-1 segment, gradually formed the benzene ring, alkenes and aromatization degree increase, and enhance the binding force of halogen and inorganic compounds by first derivative. It is known that there is no difference between the ancient paddy soil and the modern tillage paddy soil. After removing organic matter, the peak of the wave peak is weakened and the peak value of the FD value is less than the FD value before the organic matter.

【作者单位】：湖南农业大学资源环境学院;
【基金】：国家自然科学基金项目(41371228)资助~~
【分类号】：S153.621
【正文快照】： 随着水稻考古研究的发现,有关古水稻土形成与演变、土壤肥力特征、养分的释放、质量特征、生物学特性、植硅体形态及其矿化等方面已引起了科学家的关注[1-3],目前有关在水耕条件下由于环境演变、地质条件变化、自然灾害导致水稻土被掩埋或覆盖的古水稻土土壤有机质的积累与转

【相似文献】