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dc.contributor.authorRomero, Carlos M.
dc.contributor.authorEngel, Richard E.
dc.contributor.authorD'Andrilli, Juliana
dc.contributor.authorMiller, Perry R.
dc.contributor.authorWallander, Roseann
dc.identifier.citationRomero, Carlos M., Richard E. Engel, Juliana D'Andrilli, Perry R. Miller, and Roseann Wallander. "Compositional tracking of dissolved organic matter in semiarid wheat-based cropping systems using fluorescence EEMs-PARAFAC and absorbance spectroscopy." Journal of Arid Environments 167 (August 2019): 34-42. DOI:10.1016/j.jaridenv.2019.04.013.en_US
dc.description.abstractWe conducted this study to quantify long-term cropping related changes in soil organic carbon (SOC) stocks and characterize the optical properties of dissolved organic matter (DOM) after a decadal on-farm experiment in Montana, USA. Soil samples (0–50 cm) were collected from minimum till (MT) and no-till (NT) fields under fallow-winter wheat (Triticum aestivum L.; F-W) and pea-winter wheat (Pisum sativum L.; P-W) rotations. Stocks of SOC(0–50 cm) averaged 65.6 Mg C ha−1 and 60.6 Mg C ha−1 for P-W and F-W, respectively. The net SOC accretion rate for P-W equated to 0.61 Mg ha−1 yr−1 relative to F-W. We used absorbance spectroscopy and excitation-emission matrices to characterize DOM composition of samples collected from MT F-W and NT P-W. The two cropping systems exhibited similar estimates of aromaticity (absorbance at 254 nm; 0.33–0.39 a.u.) and humification index (1.83–1.86). Parallel factor (PARAFAC) analysis revealed humic-like (C1, C2), monolignol/amino acid-like (C3), and amino acid-/tannin-like (C4) components with equivalent fluorescent intensities among MT F-W and NT P-W. Fluorescence efficiencies increased with depth, suggesting a shift from larger, plant-like material to smaller, microbial-derived precursors. Overall, we found DOM composition to be minimally affected by cropping systems in this semiarid climate of the northern Great Plains.en_US
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dc.titleCompositional tracking of dissolved organic matter in semiarid wheat-based cropping systems using fluorescence EEMs-PARAFAC and absorbance spectroscopyen_US
mus.citation.journaltitleJournal of Arid Environmentsen_US
mus.relation.collegeCollege of Agricultureen_US
mus.relation.departmentLand Resources & Environmental Sciences.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.contributor.orcidRomero, Carlos M.|0000-0003-2288-7880en_US
mus.contributor.orcidMiller, Perry R.|0000-0003-4719-2137en_US

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