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首页> 外文期刊>Soil and Water Research >Differences in humic acids structure of various soil types studied by DRIFT spectroscopy
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Differences in humic acids structure of various soil types studied by DRIFT spectroscopy

机译：DRIFT光谱研究不同土壤类型的腐殖酸结构差异

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The method of diffuse reflectance infrared spectroscopy (DRIFT) proved to be useful for studying the soil organic matter structure. The aim of this study was to compare DRIFT spectra of humic acids (HAs) separated from various soils and to identify their specific nature. Samples of agricultural soils (Dystric Cambisol, Haplic Chernozem, Greyic Phaeozem, and Haplic Luvisol) were collected from humic (A) horizons. Soil samples of reclaimed dumpsites (Haplic Technosol (molic) and (calcic)) were taken from the upper part of the soil profile. Samples of forest soils were collected from surface organic (H) horizons of Cambisols in spruce ( Picea abies L. Karst. ) and beech ( Fagus silvatica L.) forests. The selected soil types differ in pH, carbon content, texture, and humus quality. An extraction of HAs was performed using a mixture of 0.5 M NaOH and 0.1 M Na 4 P 2 O 7 . The separated HAs were freeze-dried and analyzed using a DRIFT spectrometer (Thermo Nicolet Nexus) without KBr dilution. There were found differences in relative aromaticity among the agricultural soils HAs. The most aromatic character was observed in HAs from Chernozems and the least in Cambisols. Preservation of the natural structure of Chernozem HAs during the reclamation process was documented on the HAs spectra from Haplic Technosols (molic). By using the DRIFT spectra of HAs of forest H horizons, it is possible to identify the fragments of decomposed material (gymnosperms or angiosperms). HAs isolated from these horizons represent a certain interstage between lignin and the matured soil humic acids.
机译：漫反射红外光谱法（DRIFT）被证明对研究土壤有机质结构是有用的。这项研究的目的是比较从各种土壤中分离出来的腐殖酸（HAs）的DRIFT光谱，并确定其特定性质。从腐殖质（A）层中收集了农业土壤样品（Dystric Cambisol，Haplic Chernozem，Greyic Phaeozem和Haplic Luvisol）。从土壤剖面的上部采集填埋场（Haplic Technosol（摩尔）和（钙））的土壤样品。从云杉（Picea abies L.Karst。）和山毛榉（Fabus silvatica L.）森林中Cambisols的表层有机（H）层中收集森林土壤样品。所选的土壤类型在pH，碳含量，质地和腐殖质方面有所不同。使用0.5 M NaOH和0.1 M Na 4 P 2 O 7 的混合物进行HA的提取。将分离的HA冷冻干燥，并使用DRIFT光谱仪（Thermo Nicolet Nexus）进行分析，而无需稀释KBr。在农业土壤HA之间发现了相对芳香度的差异。在切尔诺泽姆的HA中观察到最多的芳香特征，而在Cambisols中观察到最少的芳香特征。在Haplic Technosols（molic）的HAs光谱中记录了开垦过程中Chernozem HAs的天然结构的保存。通过使用森林H层的HA的DRIFT光谱，可以识别分解的物质（裸子植物或被子植物）的碎片。从这些视野中分离出的HA代表了木质素和成熟的土壤腐殖酸之间的某个中间阶段。

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