The role of organo-clay associations in limiting organic matter decay: Insights from the Dajiuhu peat soil, central China
The role of organo-clay associations in limiting organic matter decay: Insights from the Dajiuhu peat soil, central China
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DOI：
10.1016/j.geoderma.2018.01.013
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发表时间：
2018-06
期刊：
影响因子：
6.1
通讯作者：
Algeo Thomas J
中科院分区：
文献类型：
--
作者：
Chen Shuling;Hong Hanlie;Huang Xianyu;Fang Qian;Yin Ke;Wang Chaowen;Zhang Yiming;Cheng Liuling;Algeo Thomas J
土壤中的矿物结合有机质(OM)在全球碳循环中具有重要意义。关于土壤有机质(SOM)的保存机制，特别是有机粘土矿物组合的作用，存在着长期的争论。在泥炭土壤中很少进行这种相关性的调查。在这项研究中，我们基于分子标记研究了湖北省中国中部大九湖泥炭土中的有机粘土关系，这有助于了解有机质的降解速率和与粘土矿物相关的有机质的保存。我们分析了土壤中粗颗粒和粘土颗粒的主要元素和微量元素化学、粘土矿物学和脂类成分。微量元素和稀土元素在土壤中(除第2层外)分布模式的均一性表明，物源物质混合良好。化学蚀变指数(CIA)值在70~85之间，代表中强风化作用。Corg：P和TOC之间的显著相关性可能表明氧化还原条件对OM的保存有显著的控制作用。大九湖泥炭地土壤的粘粒组分对有机质的保存也起到了重要作用，特别是在缺氧环境中。傅里叶变换红外光谱(FTIR)和X射线衍射仪(XRD)分析表明，OM主要吸附在伊利石晶粒边缘，而不是在层间位置。伊利石晶体的两性边缘使它们能够更有效地结合有机化合物。高RL/H比值、高碳偏好指数(CPI)和高不饱和/饱和脂肪酸比值(C18：2/C18)为伊利石有效保护有机质免受生物降解，从而提高土壤有机质含量提供了进一步的生物标志物证据。
The mineral-bound organic matter (OM) in soils is of great importance for the global carbon cycle. Long-standing debate exists regarding the mechanisms of soil organic matter (SOM) preservation and, especially, the role of organo-clay mineral associations. Investigation of such associations is rarely undertaken in peat soils. In this study, we examine organo-clay relationships in the Dajiuhu peat soil in Hubei Province, central China, based on molecular markers, which allows for understanding of rates of OM degradation and the preservation of OM associated with clay minerals. We analyzed the major and trace element chemistry, clay mineralogy, and lipid compositions of both the coarse- and clay-sized fractions of the soil. The uniformity of trace element and REE distribution patterns in the soil (except for Layer 2) suggests that the source materials were well mixed. Chemical index of alteration (CIA) values of 70–85 indicate moderate to strong weathering processes. A significant correlation between Corg:P and TOC may indicate that redox conditions were a significant control on OM preservation. The clay fraction of Dajiuhu peatland soils also has played an important role in preserving OM, especially in anoxic environments. Fourier transform infrared spectrophotometry (FTIR) and X-ray diffraction (XRD) analysis show that OM is absorbed mainly on the edges of illite grains rather than in interlayer sites. The amphoteric margins of illite crystals allow them to more effectively bind organic compounds. The high Rl/hratio, high carbon preference index (CPI), and high ratio of unsaturated-to-saturated fatty acids (C18:2/C18) in the clay-sized fraction provide further biomarker evidence that illite efficiently protects OM from biodegradation, thus enhancing the OM content of soils.
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影响因子：
2.1
作者：
P. Árkai;K. Livi;M. Frey;A. Brukner-Wein;C. Sajgó
通讯作者：
P. Árkai;K. Livi;M. Frey;A. Brukner-Wein;C. Sajgó
DOI：
10.1016/bs.agron.2017.11.001
发表时间：
2018
期刊：
--
影响因子：
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影响因子：
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作者：
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影响因子：
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作者：
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