Adsorption of organic matter on clay minerals in the Dajiuhu peat soil chronosequence, South China
Adsorption of organic matter on clay minerals in the Dajiuhu peat soil chronosequence, South China
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华南大九湖泥炭土粘土矿物对有机质的吸附作用
DOI：
10.1016/j.clay.2019.105125
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发表时间：
2019-09
影响因子：
5.6
通讯作者：
Zhao Lulu
中科院分区：
文献类型：
--
作者：
Hong Hanlie;Chen Shuling;Fang Qian;Algeo Thomas J.;Zhao Lulu
粘土矿物在土壤有机质稳定中起着重要作用。为了研究泥炭地土壤中有机质与粘土矿物的关系，湖北大九湖泥炭地250 cm长岩芯样品中的粘土（> 0.3mm）和粘粒（<2 μm）组分采用气相色谱-质谱（GC-MS）、固体13 C核磁共振（NMR）、和傅里叶变换红外分光光度法（FTIR）。α-烷烃主要由C21 ~ C33碳原子组成，且表现出奇大于偶的优势。与粘土矿物相关联的烷烃在老土壤中更好地保护免受生物降解，而年轻土壤中的粘土矿物则不利于OM相互作用。脂肪酸主要为饱和直链酸（C12-C30），少量为支链和不饱和酸，表现出偶数多于奇数的优势。短链脂肪酸在土壤中的广泛分布表明微生物活动强烈。核磁共振结果证实了存在的烷基C，O-烷基C，芳基C，和羧基C的土壤沉积物。芳香族化合物易于吸附在粘土矿物上，其在粘土组分中的丰度随着成岩作用的进行而增加。多糖主要存在于年轻的土壤中，并观察到与粘土矿物强烈结合，但这些化合物由于其结构不稳定而易于微生物降解。芳香族化合物主要结合在硅基面上。一般来说，老土壤的特点是芳香族化合物和粘土矿物之间的化学相互作用较强，反映了他们的较低的波段位置。然而，只有少量的芳香族化合物被发现与粘土矿物的化学络合，而大多数OM在样品中的物理粘土矿物聚集体被困。有机质的保存在较低的配置文件的泥炭土主要是由于持续的还原条件。
Clay minerals play important roles in stabilizing organic matter (OM) in soils. In order to investigate the nature of OM in association with clay minerals in peatland soils, the coarse (>0.3 mm) and clay (<2 μm) fractions of samples from a 250-cm-long core from the Dajiuhu peatland in Hubei Province (central China) were analyzed using gas chromatography–mass spectrometry (GC–MS), solid state13C nuclear magnetic resonance (NMR) spectroscopy, and Fourier transform infrared spectrophotometry (FTIR) methods. Then-alkanes consist mainly of carbon numbers of C21to C33and show odd-over-even predominance. Alkanes associated with clay minerals are better protected from biodegradation in old soils, whereas clay minerals in young soils are less favorable for OM interaction. Fatty acids are mainly saturated straight-chain acids (C12–C30), with minor branched and unsaturated acids, showing even-over-odd predominance. The wide distribution of short-chain fatty acids in the soils indicates intensive microbial activity. NMR results confirmed the occurrence of alkyl C, O-alkyl C, aryl C, and carboxyl C in the soil deposits. Aromatic compounds are prone to adsorb to clay minerals, and their abundances in the clay fraction increase as diagenesis proceeds. Polysaccharides are present mainly in young soils and are observed strongly binding to clay minerals, but these compounds are prone to microbial degradation due to their structural instability. Aromatic compounds are bound mainly on the silicon-basal planes. In general, old soils are characterized by stronger chemical interactions between aromatic compounds and clay minerals, as reflected by their lower band positions. Nevertheless, only small amounts of aromatic compounds were found chemically complexed with clay minerals, while most OM in the samples was physically trapped by clay-mineral aggregates. Preservation of OM in the lower profile of the peat soils is mainly attributed to persistently reducing conditions.
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影响因子：
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作者：
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通讯作者：
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影响因子：
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影响因子：
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通讯作者：
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