Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter

Water-extractable organic matter (WEOM) is an indicator of active and labile pools of soil organic matter (SOM). Land-use is expected to have a major effect on SOM, yet the effects of different land-uses on WEOM are not well understood. Reported trends in the changes in water-extractable organic C (...

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Autores principales:	Oshri Rinot, Mikhail Borisover, Guy J. Levy, Gil Eshel
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2021
Materias:	Climatic region Excitation-emission matrix Land-use Parallel factor analysis Soil health Water-extractable organic matter Ecology QH540-549.5
Acceso en línea:	https://doaj.org/article/0ba03a8eaeaf4da5a5d2c15ba8c02255
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spelling	oai:doaj.org-article:0ba03a8eaeaf4da5a5d2c15ba8c022552021-12-01T04:35:13ZFluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter1470-160X10.1016/j.ecolind.2020.107103https://doaj.org/article/0ba03a8eaeaf4da5a5d2c15ba8c022552021-02-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S1470160X20310426https://doaj.org/toc/1470-160XWater-extractable organic matter (WEOM) is an indicator of active and labile pools of soil organic matter (SOM). Land-use is expected to have a major effect on SOM, yet the effects of different land-uses on WEOM are not well understood. Reported trends in the changes in water-extractable organic C (WEOC) concentrations following changes in land-use are inconsistent or even contradictory. Fluorescent WEOM components, including humic-like and proteinaceous substances, may be useful for elucidating long-term effects of different land-uses on WEOM content and composition. Therefore, the objectives of this research were (i) to characterize SOM and WEOM in soils from different climatic regions that were subjected to different land-uses and (ii) to compare the sensitivity of fluorescent components in WEOM to that of other SOM/WEOM attributes for evaluating the impact of land-use and climatic region on SOM. Two soil types from different climatic regions (Mediterranean and semi-arid) that were collected from land subjected to different uses (field crops, orchards and non-cultivated plots) and characterized for total soil organic C and total N. The concentration of WEOC, UV absorbance at 254 nm and excitation-emission matrices (EEMs) of fluorescence were determined in diluted solution extracts. Parallel-factor (PARAFAC) analysis was applied to identify meaningful fluorescent components of WEOM and quantify their presence. Most of the quantitative measures used for SOM and WEOM characterization demonstrated insignificant and/or inconsistent relationships with the type of land-use and climatic region. However, EEM-PARAFAC-derived fluorescent components present in soil WEOM and, specifically, their relative fractions exhibited significant associations with the climatic region and type of land-use. These results may support the use of EEM-PARAFAC fluorescent components as indicators for the assessment of soil health.Oshri RinotMikhail BorisoverGuy J. LevyGil EshelElsevierarticleClimatic regionExcitation-emission matrixLand-useParallel factor analysisSoil healthWater-extractable organic matterEcologyQH540-549.5ENEcological Indicators, Vol 121, Iss , Pp 107103- (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Climatic region Excitation-emission matrix Land-use Parallel factor analysis Soil health Water-extractable organic matter Ecology QH540-549.5
spellingShingle	Climatic region Excitation-emission matrix Land-use Parallel factor analysis Soil health Water-extractable organic matter Ecology QH540-549.5 Oshri Rinot Mikhail Borisover Guy J. Levy Gil Eshel Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter
description	Water-extractable organic matter (WEOM) is an indicator of active and labile pools of soil organic matter (SOM). Land-use is expected to have a major effect on SOM, yet the effects of different land-uses on WEOM are not well understood. Reported trends in the changes in water-extractable organic C (WEOC) concentrations following changes in land-use are inconsistent or even contradictory. Fluorescent WEOM components, including humic-like and proteinaceous substances, may be useful for elucidating long-term effects of different land-uses on WEOM content and composition. Therefore, the objectives of this research were (i) to characterize SOM and WEOM in soils from different climatic regions that were subjected to different land-uses and (ii) to compare the sensitivity of fluorescent components in WEOM to that of other SOM/WEOM attributes for evaluating the impact of land-use and climatic region on SOM. Two soil types from different climatic regions (Mediterranean and semi-arid) that were collected from land subjected to different uses (field crops, orchards and non-cultivated plots) and characterized for total soil organic C and total N. The concentration of WEOC, UV absorbance at 254 nm and excitation-emission matrices (EEMs) of fluorescence were determined in diluted solution extracts. Parallel-factor (PARAFAC) analysis was applied to identify meaningful fluorescent components of WEOM and quantify their presence. Most of the quantitative measures used for SOM and WEOM characterization demonstrated insignificant and/or inconsistent relationships with the type of land-use and climatic region. However, EEM-PARAFAC-derived fluorescent components present in soil WEOM and, specifically, their relative fractions exhibited significant associations with the climatic region and type of land-use. These results may support the use of EEM-PARAFAC fluorescent components as indicators for the assessment of soil health.
format	article
author	Oshri Rinot Mikhail Borisover Guy J. Levy Gil Eshel
author_facet	Oshri Rinot Mikhail Borisover Guy J. Levy Gil Eshel
author_sort	Oshri Rinot
title	Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter
title_short	Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter
title_full	Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter
title_fullStr	Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter
title_full_unstemmed	Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter
title_sort	fluorescence spectroscopy: a sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter
publisher	Elsevier
publishDate	2021
url	https://doaj.org/article/0ba03a8eaeaf4da5a5d2c15ba8c02255
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Fluorescence spectroscopy: A sensitive tool for identifying land-use and climatic region effects on the characteristics of water-extractable soil organic matter

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