水稻秸杆腐解过程溶解性有机质红外光谱研究  

Study on Fourier-transform Infrared Spectra of Dissolved Organic Matters Extracted from Rice Straw at Different Decay Stages

作　　者：倪文海[1] 刘欢[1] 刘振涛[1] 罗荣[1] 周江敏[1] 陈华林[1] 葛世玫[1] 代静玉[2] 

机构地区：[1]温州大学生命与环境科学学院,浙江温州325027 [2]南京农业大学资源与环境科学学院,南京210095

出　　处：《土壤》2013年第2期220-226,共7页Soils

基　　金：国家自然科学基金项目(40506015);浙江省自然科学基金项目(Y307068)资助

摘　　要：采用傅里叶红外光谱（FTIR）分析方法研究了水稻秸杆不同腐解阶段产生溶解性有机质（dissolvedorganicmatter，DOM）及其分组组分的结构特征。结果表明，水稻秸杆腐解过程中DOM组成成分的变化呈现出明显的阶段性。在第0～3天，秸杆本身含有的糖类、氨基酸等小分子物质因微生物繁殖迅速消失；第3～63天，主要是秸杆中的半纤维素、纤维素的分解阶段，DOM组成中多糖类、烷烃类物质呈现起伏性变化；第63天后，主要是腐殖化阶段，DOM分子结构复杂化。各分组组分的结构特征有明显差异，且各组分均随腐解延长而发生变化，即多糖类物质减少，芳香族物质增多，分子结构复杂化。Fourier-transform infrared spectra(FTIR) was used to study the characteristics of dissolved organic matters(DOM) extracted from rice straw at different decay stages.The results showed that there were three stages for the dynamic change of DOM properties during decay: at the first stage(0 3 d),the low-weight-molecular sugar,amino-acid diminished rapidly due to the microorganism growth;at the second stage(3 63 d),the content of polysaccharides and aliphatic hydrocarbons in DOM leveled off in a range which was caused by the decomposition of hemi-cellulose and cellulose;after 63 d,it was the humification stage of DOM indicating by the polymerization of carbohydrates and aliphatic hydrocarbons based on the core of aromatic rings,which induced the more complicated molecular structure of DOM.At different stages,the structural properties of the fractions varied with decay indicating by the decrease of polysaccharides and increase of aromatic components.

关 键 词：溶解性有机质 红外光谱 水稻秸杆 

分 类 号：S154.1[农业科学—土壤学]