摘要
采用元素分析,1H—NMR和FTIR研究了3种水稻土中水溶性有机质(DOM)的组成及结构特征,并与富里酸(FA)、胡敏酸(HA)进行了比较。结果表明,DOM主要由碳水化合物组成,芳香族物质少,烷基链烃含量少且支链短,分子结构简单;HA含有大量的芳香族不饱和物质,烷基链烃含量多且支链长;FA含有大量的羧基官能团。3种土壤HA的结构组成相似,而DOM则变化较大,即桑园土壤DOM碳水化合物含量相对较多;水杉土壤DOM烷烃物质和芳香族不饱和物质较多,而碳水化合物相对少;水田土壤DOM介于两者之间。
Dissolved organic matter (DOM) from three paddy soils was studied by elemental composition, FTIR and 1H— NMR analysis, in comparison with fulvic (FA) and humic acids (HA).There is a large discrepancy between DOM, FA and HA. HA showed higher aromatic character and large- chain alkyl carbons in its structure. FA was characterized by large amount of carboxylic functional group. Whereas DOM consisted primarily of carbohydrate, but of little aromatic organic constituents and alkyl constituents. Structure and characteristics of HA are similar in all the studied soils. The composition of DOM was affected by land use pattern. DOM in mulberry soil contained more carbohydrate than others, while DOM in redwood contained much of alkyl and aromatic constituents.
出处
《农业环境科学学报》
CAS
CSCD
北大核心
2003年第6期731-735,共5页
Journal of Agro-Environment Science
基金
国家自然科学基金(20177009)
关键词
土壤
水溶性有机质
结构特征
环境条件
富里酸
胡敏酸
dissolved organic matter (DOM)
structural characteristics
fulvic acid (FA)
humic acid (HA)
