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Soil Chemistry

Dissolved Organic Matter Characterization Using Multiway Spectral Decomposition of Fluorescence Landscapes

^a Dep. of Plant, Soil, and Environmental Sciences, Univ. of Maine, 5722 Deering Hall, Orono, ME 04469-5722
^b Royal Veterinary and Agricultural Univ., Rolighedsvej 30, DK-1958 Frederiksberg C, Denmark

^* Corresponding author (ohno{at}maine.edu)

Dissolved organic matter (DOM) plays an important role in many soil ecosystem functions. Multidimensional fluorescence spectroscopy of DOM with parallel factor analysis (PARAFAC) of the resulting spectral landscape has been successful in characterizing DOM from a variety of aquatic sources. This study was conducted to assess the multiway PARAFAC approach for quantitatively characterizing the fluorescent landscapes of DOM from aqueous extracts of soils and soil amendments. The DOM was extracted from plant biomass representative of crop, wetlands, and tree species; animal manures; and soils from controlled studies of cropping systems with known histories of organic amendments. The fluorescence landscape spectra were collected in the excitation range from 240 to 400 nm and emission range from 300 to 500 nm in 3-nm increments. The excitation and emission spectra modeled from the PARAFAC analysis showed that the plant biomass, animal manure, and soil DOM contained five fluorescing components: tryptophan-like (peak location at excitation 270 nm, emission 354 nm), tyrosine-like (273/309 nm), and three humic-substance-like components (>240/465 nm, 306/405 nm, and 315/447 nm). Principal component analysis of the concentration loading showed that the soil-derived DOM was very similar despite the different types and quantities of organic amendments incorporated in the different cropping systems. This study shows that PARAFAC analysis of multidimensional fluorescence spectra can model the chemical profile of terrestrial DOM in a chemically meaningful way. This represents a significant advance over current approaches to interpreting the complex DOM fluorescence spectra.

Abbreviations: DOM, dissolved organic matter • EEM, excitation–emission matrix • PARAFAC, parallel factor analysis

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