Laboratoire de Spectrométrie des Matériaux et Archéomatériaux, URL-CNRST N°7, Faculté des Sciences, University of Moulay Ismail, Meknes, Morocco.
INRAE, UR Riverly, 69625, Villeurbanne, France.
J Fluoresc. 2022 Nov;32(6):2141-2149. doi: 10.1007/s10895-022-03011-3. Epub 2022 Aug 11.
The present study, combining UV-Visible absorption and 3D fluorescence supported by PARAFAC chemometric analysis, focused on the characterization of soil water extractable organic matter (WEOM) in the zone of Doukkala located near the Atlantic coast of Morocco. The extracts, in water, of a set of 30 samples covering the four main types of agricultural soils in the region (commonly labeled Tirs, Faid, Hamri and R'mel) were investigated. [Formula: see text] and [Formula: see text] absorbance ratios [Formula: see text] and [Formula: see text] spectral slopes, along with their ratios[Formula: see text], as well as the fluorescence [Formula: see text] and humification [Formula: see text] indices were calculated and interpreted. In the four soil types, these parameters revealed, on the one hand, organic materials of terrigenous origin with some biological component, and showed, on the other hand, that these materials are in similar stages of humification with an important humic character. In all the soils investigated, 3D fluorescence crossed with PARAFAC chemometrics highlighted the absence of any protein component and revealed the prevalence of the fulvic acids fraction in the organic matter humic material.
本研究结合紫外-可见吸收和 PARAFAC 化学计量分析支持的三维荧光，重点研究了位于摩洛哥大西洋沿岸附近的杜卡拉地区土壤可提取有机物质（WEOM）的特征。对涵盖该地区四种主要农业土壤类型（通常标记为 Tirs、Faid、Hamri 和 R'mel）的 30 个样本的一组水提取物进行了研究。[公式：见正文]和[公式：见正文]吸光度比[公式：见正文]和[公式：见正文]光谱斜率，以及它们的比值[公式：见正文]，以及荧光[公式：见正文]和腐殖化[公式：见正文]指数进行了计算和解释。在四种土壤类型中，这些参数一方面揭示了具有一定生物成分的陆源有机物质，另一方面表明这些物质处于相似的腐殖化阶段，具有重要的腐殖质特征。在所研究的所有土壤中，三维荧光与 PARAFAC 化学计量学的交叉突出表明没有任何蛋白质成分，并揭示了富里酸在有机物质腐殖质中的优势。
