milarities of~(13)C NMR Spectroscopic Properties of Humic Acids Between Black Soils–Andosols and Chernozems

摘要

Andosols and Chernozems are characterized as the soils with a thick black surface layer that is rich in organic matter though their parent materials, regional distribution, and pH conditions are different [1]. A number of NMR analytical studies for the properties of humic acids (HAs) in these soils have been performed [e.g. 2–7]. As a result, it has revealed that HAs in both soil types are often rich in aromatic structures. There is now increasing evidence that much of these aromatic properties are due to the effects of accumulation of charred plant remains (or black carbon (C)) from periodic burning of the vegetation [e.g. 6–9]. Further understanding of the soil C storage in both black soils has received much interest recently due to their relevance in the global C cycle. However, work on comparative characteristics of NMR spectra between HAs in Andosols and Chernozems has not been reported. The aim of this study is to assess the similarities between HAs in Andosols and Chernozems distributed worldwide using NMR characteristics, and to compare them with those in other soils.