土壤中溶解性有机质分组组分的结构特征研究
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* 国家自然科学基金项目(20177009)资助


STRUCTURAL CHARACTERISTICS OF DISSOLVED ORGANIC MATTER FRACTIONS EXTRACTED FROM SOILS DIFFERENT IN LAND USE
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    摘要:

    以Leenheer的分组方法为基础,用XAD8树脂将黄泥土中水溶性有机质(DOM)按极性和电荷特性分为结构较为均一的不同组分,并采用元素分析、1HNMR以及CP/MAS13C-NMR研究各组分的性质。初步认为:三种不同利用方式下(桑园、水田、水杉)黄泥土中的DOM组成中疏水碱性组分(HOB)含量很少,疏水中性组分(HON)相对含量为7%~15%,亲水性组分(HIM)是土壤DOM中最大组成部分,约占35%。元素分析、1HNMR以及13C-NMR分析结果表明:DOM各组分结构特征差异显著。HON以含有大量的长链烷烃为主要结构特征,并含有较多氨基酸、多肽类物质;疏水酸性组分(HOA)的结构特征相似于土壤FA,含有大量羧基,但与FA相比芳香族物质减少,碳水化合物增多;酸不溶组分(AIM)以多酚类、腐殖质结合的碳水化合物为主要组成物质;HIM中则含有大量碳水化合物。

    Abstract:

    Based on a modified Leenheer fractionation scheme,dissolved organic matter (DOM) extracted from Huang-nitu under different land use were fractioned according to their polarities and charge characteristics by using XAD-8 resin.The characteristics were studied with the aid of elemental analysis,1H-NMR and CP/ MAS-13C-NMR spectroscopy.It was preliminarily found that of the total DOM extracted from the paddy soils,HIM predominated,accounting for about 35%,HON accounted for 7%~15% and HOB for a little.As is shown by the elemental analysis,1H-NMR and 13C-NMR spectra,HON was characterized mainly by longchain alkylate with 77.13% of aliphatic C.N from the DOM could be found primarily in fraction HON.Comparison between the spectra of HOA and fulvic acids (FA) indicated that both contained a large amount of carboxylic groups and that the former contained more carbohydrates and less aromaticity.Finally,fraction AIM consisted of high-branched polyphenols and humic bound carbohydrates,and fraction HIM contained a high amount of carbohydrates.

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代静玉,秦淑平,周江敏.土壤中溶解性有机质分组组分的结构特征研究[J].土壤学报,2004,41(5):721-727. DOI:10.11766/trxb200309040509 Dai Jingyu, Qin Shuping, Zhou Jiangmin. STRUCTURAL CHARACTERISTICS OF DISSOLVED ORGANIC MATTER FRACTIONS EXTRACTED FROM SOILS DIFFERENT IN LAND USE[J]. Acta Pedologica Sinica,2004,41(5):721-727.

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  • 收稿日期:2003-09-04
  • 最后修改日期:2004-02-15
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  • 在线发布日期: 2013-02-25
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