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Differences in Humic Acids Structure of Various Soil Types Studied by DRIFT Spectroscopy

机译：漂移光谱研究各种土壤类型腐殖酸结构的差异

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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 Na4P2O7. 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（漂移）的方法证明是用于研究土壤有机质结构的用途。本研究的目的是将腐殖液（具有）与各种土壤分离的漂移光谱进行比较，并鉴定其特定性质。从腐殖质（A）视野中收集农业土壤样品（滴定蛋白醇，单体醇，葡萄球菌，血液植物血红素）。从土壤剖面的上部取出回收倾卸液体的土壤样品（超级肌肉（莫里奇）和（钙）和（钙））。从云杉（Picea Abies L. Karst）和山毛榉（Fagus Silvatica L.）森林中，从表面有机（H）视野中收集森林土壤样本。所选土壤类型不同于pH，碳含量，质地和腐殖质质量。使用0.5M NaOH和0.1M Na 4 P 2 O 7的混合物进行萃取。分离的已经冷冻干燥并使用漂移光谱仪（Thermo Nicolet Nexus）分析而没有KBr稀释。发现农业土壤中相对芳香性的发现差异。在Chernozems和雪宝醇中观察到最芳香的性格。在填海工艺期间，Chernozem的自然结构的保存已记录在Haplic Technols（Molic）的具有光谱上。通过使用森林H视野的漂移光谱，可以识别分解材料的片段（裸子植物或高管植物）。从这些视野中孤立代表木质素和成熟的土壤腐殖酸之间的一定级间。

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