黑土、栗钙土和潮土胡敏酸分子结构的差异性分析  

Molecular Structure Differences of Humic Acid in Black Soil,Chestnut Soil and Fluvo-aqulc Soil

作　　者：郑殷恬[1] 赵红[1] 赵楠[1] 吕贻忠[1] 

机构地区：[1]中国农业大学资源与环境学院,北京100193

出　　处：《土壤》2011年第5期804-808,共5页Soils

基　　金：十一五国家科技支撑课题项目(2006BAD15B01);国家自然科学基金项目(40771099)资助

摘　　要：以北方典型的黑土、栗钙土和潮土提取的胡敏酸为研究对象,通过元素分析、傅里叶红外光谱仪及13C核磁共振仪对三者进行结构分析。不同胡敏酸的各种元素含量略有差别,各种官能团含量也不同。元素分析结果来看H/C原子比潮土最高,栗钙土次之,黑土最少;O/C的原子比三者没有明显的差别;C/N比呈现由高到低的次序分别为黑土、栗钙土、潮土。3种胡敏酸的红外光谱吸收峰相似,但吸收强度有差别,如3 352 cm-1和2 931 cm-1处潮土和栗钙土信号强度相当,黑土较低,而在2 580 cm-1处三者信号差异不明显,1 720,1 620,1 420,1 220 cm-1这4个吸收峰信号强弱均为黑土最强,栗钙土次之,潮土最弱。而从核磁共振图谱可以看出潮土结构中含有更多的多糖和蛋白质类结构单元;黑土有机质含量高,芳香化程度也较高。This study studied humic acid structures of the typical northern soil, i.e., black soil, chestnut soil and fluvo-aqulc soil by using elemental analyzer, Fourier transform infrared spectrometer and 13C NMR. Both the contents of various elements and functional groups in humic acids of three kinds of soils were different. H/C atomic ratio was in an order of fluvo-aqulc soil〉 chestnut soil 〉 black soil, O/C atomic ratio was not significantly different in the three kinds of soils. C/N atomic ratio presented in an order of black soil 〉chestnut soil 〉 fiuvo-aqulc soil. The positions of the absorption peaks in infrared spectra of humic acids were similar in the three kinds of soils but different in the peak intensity, the signal intensities at 3 352 cm-1 and 2 931 cm-1 of fluvo-aqulc soil and chestnut soil were equivalent while black soil was lower; the signal intensities at 2 580 cm-t of the three kinds of soils differed little. The signal intensities at 1 720, 1 620, 1 420 and 1220 cm-1 were all in an order of black soil 〉chestnut soil 〉 fluvo-aqulc soil, 13C NMR showed more polysaccharides and protein structural units contained the structure of fluvo-aqulc soil; black soil had higher organic matter and a higher degree of aromatization.

关 键 词：胡敏酸 元素分析 红外 核磁共振 

分 类 号：S153.6[农业科学—土壤学]