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首页> 外文期刊>Organic Geochemistry: A Publication of the International Association of Geochemistry and Cosmochemistry >Organic geochemical evaluation of organic acids to assess anthropogenic soil deposits of Central Amazon, Brazil
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Organic geochemical evaluation of organic acids to assess anthropogenic soil deposits of Central Amazon, Brazil

机译：有机酸的有机地球化学评估，以评估巴西中部亚马逊市的人为土壤沉积物

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摘要

Terra Preta de índio (TPI) and Terra Mulata (TM) are anthropogenic soils from the Amazon region and are rich in stable organic matter (OM). The formation and incorporation of OM in these soils has recently been under investigation. Organic geochemical analysis is an appropriated tool for the assessment of the sources of OM. Therefore, we have used the distribution of different acid classes preserved in the free and bound soil fractions of 12 samples from two contrasting anthropogenic soils (TPI, TM) and an adjacent soil, in order to infer the sources of OM and the magnitude of non-cultural influence on the formation of anthropogenic soils. The major acids in both fractions (i.e. free and bound) were n-saturated, branched and unsaturated alkanoic acids, hydroxyalkanoic acids, bile acids and lignin/suberin derived aromatic acids. In general, the acids in the free and bound fractions appeared to be complementary and together provided valuable information about OM incorporation into anthropogenic soils. Different incorporation of ω-hydroxyalkanoic acids (C_(22), C_(24) and C_(28)) and 9(10),16-dihydroxyhexadecanoic acid, and presence/absence of bile acid showed a distinct genesis for the soils. The influence of modern vegetation was revealed by bound ω-hydroxyalkanoic acid (C_(22), C_(24) and C_(28)) distributions only in the topsoil profiles of TPI and TM, indicating that organic geochemical analysis is a useful approach in the investigation of ancient human deposits in tropical archaeological soils.
机译：Terra Preta deíndio（TPI）和Terra Mulata（TM）是来自亚马逊地区的人为土壤，富含稳定的有机质（OM）。最近正在研究在这些土壤中OM的形成和结合。有机地球化学分析是评估OM来源的合适工具。因此，我们使用了保存在来自两个相反的人为土壤（TPI，TM）和邻近土壤的12个样品的自由结合土壤组分中保留的不同酸类别的分布，以便推断出OM的来源和非土壤的强度。文化对人为土壤形成的影响。两种馏分中的主要酸（即游离的和结合的）是n-饱和的，支链的和不饱和的链烷酸，羟基链烷酸，胆汁酸和木质素/木栓质衍生的芳族酸。通常，游离级分和结合级分中的酸似乎是互补的，并且一起提供了有关OM掺入人为土壤的有价值的信息。 ω-羟基链烷酸（C_（22），C_（24）和C_（28））和9（10），16-二羟基十六烷酸的不同掺入以及胆汁酸的存在与否表明了土壤的独特成因。仅在TPI和TM的表土剖面中，结合的ω-羟基链烷酸（C_（22），C_（24）和C_（28））的分布揭示了现代植被的影响，表明有机地球化学分析是一种有用的方法。对热带考古土壤中古代人类沉积物的研究。

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