Bulk optical characterization of dissolved organic matter from semiarid wheat-based cropping systems

Abstract

Bulk optical characterization of dissolved organic matter from semiarid wheat-based cropping systems," Geoderma 306, (November 2017): 40-49. Made available through Montana State University's ScholarWorks scholarworks.montana.edu

Short-term effects of fertilization on dissolved organic matter (DOM) in soil leachate

“…CC BY 4.0 License. Humic-like (Coble, 1996;Graeber et al, 2012;Williams et al, 2010); oxidized quinone-like (Chai et al, 2019); Terrestrial or ubiquitous (Coble, 1996;Williams et al, 2010) derived from OM from plant and soil (Ziegelgruber et al, 2013 Humic-like (Graeber et al, 2012;Williams et al, 2010) terrestrial OM products, mainly forest and wetlands (Stedmon and Markager, 2005) oxidized quinones-like (Cory and McKnight, 2005) 320Humiclike (Graeber et al, 2012;Romero et al, 2017;Williams et al, 2010); terrestrial (Stedmon and Markager, 2005) LMW fulvic/humic (Olefeldt et al, 2013) Close to humic-like (Cory and McKnight, 2005;Stedmon and Markager, 2005), soil fulvic acid-like (Chai et al, 2019;Stedmon et al, 2003), ubiquitous (Stedmon and Markager, 2005), reduced terrestrial semi-quinone-like (Cory and McKnight, 2005), positively related to agriculture and bacterial production (Graeber et al, 2012) 5 310-400 320 240-330…”

“…Table 3 gives an overview about the observed components of PARAFAC modelling, their emission and excitation wavelengths as well as the references they refer to. According to literature, fluorophores C1-C4 are similar to humic-like fluorophores, whereby C1 and C2 are supposed to represent terrestrial DOM derived from forests and wetlands (Coble, 1996;Graeber et al, 2012;Romero et al, 2017), while C3 and C4 are probably microbially altered DOM, related to agriculture and with a low molecular weight (Graeber et al, 2012;Tfaily et al, 2015). Fluorophore C5 is similar to proteintannin-like fluorophores (Romero et al, 2017) and C6 is assigned to microbially transformed soil fulvic acids (Williams et al, 2010).…”

“…Tryptophan-like (Gao et al, 2016;Graeber et al, 2012), microbial processing; Protein-tannin-like (Romero et al, 2017), amino acids, free or bound in proteins; indicate intact proteins or less degraded peptide material (Fellman et al, 2010) 6 280-520 510 260-280…”

Grassland-cropland rotation cycles in crop-livestock farming systems regulate priming effect potential in soils through modulation of microbial communities, composition of soil organic matter and abiotic soil properties

“…3H). like" material and negatively correlated with DOM bioavailability (Lambert et al, 2017;Romero et al, 2017), whereas the CP1 (Fluo) secondary peak is similar to fluorophores correlated to biological activity in freshwater DOM (CP3 and CP5 in Lambert et al, 2017). The spectra obtained for CP2 (Fluo) resemble those of CP1 (Fluo) with a shift towards longer wavelengths, previously described as "terrestrial humic-like" compounds (Stedmon and Markager, 2005) with greater aromaticity, higher molecular weight, and a larger degree of conjugation.…”

Fluorescence analysis allows to predict the oxidative capacity of humic quinones in dissolved organic matter: implication for pollutant degradation

“…Component C3 (λ exc = 245 and 315 nm/λ em = 400 nm) was already observed (Osburn et al 2012;Romero et al 2017;Stedmon et al 2003) and assigned as fluorophores from terrestrial origin possibly produced by (photo)degradation (Osburn et al 2012). Component C4 (λ exc = 260 and 370 nm/λ em = 480 nm) is also a widespread component that has been described as high molecular weight fluorophores (Kowalczuk et al 2013;Murphy et al 2006;Stedmon et al 2007).…”