Formation and Changes of Humic Acid Properties during Peat Humification Process within Ombrotrophic Bogs

Studies of the living organic matter humification process are essential for understanding the carbon biogeochemical cycle. The aim of this study is to analyze relations between the properties of peat, peat humic acids and peat humification degree. The analysis has been done on samples of humic substances extracted from peat profiles in two ombrotrophic bogs and relations between peat age, decomposition and humification degree, botanical composition and properties of peat humic acids (elemental, functional composition) were studied. The found variability of peat properties is less significant than differences in the properties of peat-forming living matter, thus revealing the dominant impact of humification process on the properties of peat. Correspondingly, composition of peat humic acids is little affected by differences in the composition of precursor living organic material.

雨养沼泽泥炭腐植酸的性质和结构

腐植酸类物质是土壤、泥炭和自然水体中有机物的主要成分,其来源不同,结构和性质也不同。本研究阐述了雨养沼泽泥炭腐植酸的性质,评估了泥炭剖面内腐植酸的均质性,并研究了泥炭腐殖化程度对腐植酸性能的影响。结果表明,以不同来源的苔藓为主的雨养沼泽植物对泥炭腐植酸结构的影响较大。泥炭腐植酸的成岩作用程度介于活有机体和煤炭之间,当碳水化合物、氨基酸等被破坏后,耐分解的芳烃和多环芳烃结构出现,泥炭腐植酸的结构趋于形成。然而,与土壤、水体和其他腐植酸相比,泥炭腐植酸的芳香性较低。相对而言,雨养沼泽泥炭腐植酸处于活有机体向成岩转化过程的初始阶段。羧基和酚羟基含量的变化取决于提取腐植酸的泥炭年龄和分解程度,羧酸酸度随泥炭深度和腐殖化程度增加而增大。

雨养沼泽泥炭腐殖化过程中的腐植酸性质成因与变化研究

研究生命有机物质的腐殖化过程是了解碳的生物化学循环所必不可少的。本研究的主要目的是分析泥炭性质、泥炭腐植酸与泥炭腐殖化度三者之间的关系。对两个雨养泥炭沼泽的泥炭剖面各层中提取的腐植酸样品进行了分析,并对泥炭年龄、分解度、腐殖化度、植物构成、泥炭腐植酸性质(元素和有效成分)进行了研究。结果发现,泥炭腐植酸的组成受造炭生命有机物质前体的组成影响较小,对造炭生物性质多样性的研究要比对泥炭性质多样性的研究更有意义,由此可以揭示腐殖化过程对泥炭性质的主导性作用。