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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

View larger version (17K): [in a new window]   Fig. 1. Fluorescence emission spectra for dissolved organic matter that was extracted from wheat straw residue, poultry manure, and the Liebman E Rotation soil. Excitation wavelength was 254 nm (AU = arbitrary units).

View larger version (55K): [in a new window]   Fig. 2. Full scan excitation–emission matrix fluorescence spectrum for beef manure-amended soil from the Potato Ecosystem Study.

View larger version (15K): [in a new window]   Fig. 3. Core consistency diagnostic values for the non-negativity-constrained PARAFAC models having two to seven components for the plant biomass, animal manure, and soil DOM data set.

View larger version (26K): [in a new window]   Fig. 4. Excitation and emission spectral loadings of the non-negativity-constrained five- component PARAFAC model of the plant biomass, animal manure, and soil DOM data set.

View larger version (22K): [in a new window]   Fig. 5. Relative percentage distribution of the contents for the five components in the PARAFAC model for the DOM extracted from: (A) soils, (B) animal manures, (C) crop species, (D) wetland plants, and (E) tree leaves.

View larger version (18K): [in a new window]   Fig. 6. Principal component (PC) analysis of the concentration scores for the five components in the PARAFAC model of the plant biomass, animal manure, and soil DOM data set.

View larger version (15K): [in a new window]   Fig. 7. Excitation and emission spectral loadings of the non-negativity-constrained three-component PARAFAC model for the reference humic substances.