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dc.contributor.authorRomero, Carlos M.
dc.contributor.authorEngel, Richard E.
dc.contributor.authorD'Andrilli, Juliana
dc.contributor.authorChen, Cheng-Sao
dc.contributor.authorZabinski, Catherine A.
dc.contributor.authorMiller, Perry R.
dc.contributor.authorWallander, R.
dc.date.accessioned2018-01-18T17:57:34Z
dc.date.available2018-01-18T17:57:34Z
dc.date.issued2017-11
dc.identifier.citationRomero C.M., R.E. Engel, J. D'Andrilli, C. Chen, C. Zabinski, P.R. Miller, R. Wallander, "Bulk optical characterization of dissolved organic matter from semiarid wheat-based cropping systems," Geoderma 306, (November 2017): 40-49. doi: 10.1016/j.geoderma.2017.06.029.en_US
dc.identifier.issn0016-7061
dc.identifier.urihttps://scholarworks.montana.edu/xmlui/handle/1/14162
dc.description.abstractDissolved organic matter (DOM) plays a critical role in the cycling of nutrients and long-term agricultural sustainability. The composition of DOM in soil is likely altered due to management, yet there is limited knowledge on the effect of long-term cropping on DOM chemical character. Here, we characterized water extractable DOM composition along a gradient of soil organic carbon (SOC) affected by differing cropping and tillage intensity in a semiarid climate of the northern Great Plains, USA. Soil samples (0–10, 10–20, 20–30 cm) were collected from conventional till-fallow winter wheat (Triticum aestivum L.; Ftill-W), no-till spring pea/oilseed-wheat (Pisum sativum L.; Pg/O-W), and no-till continuous wheat (W-W) fields, and analyzed using UV/Vis absorbance and excitation-emission matrix fluorescence spectroscopy. The concentration of DOM decreased with depth and was significantly greater (P < 0.05) under W-W or Pg/O-W than Ftill-W. The absorbance at 254 nm (Abs254), a proxy for DOM aromatic nature, indicated that aromaticity decreased with depth and lower biomass-C inputs (i.e. W-W ≥ Pg/O-W ≥ Ftill-W). Multidimensional parallel factor (PARAFAC) analysis revealed humic-like (C1, C2), monolignol-like (C3), and protein/tannin-like (C4) components with varying fluorescence intensities as a function of cropping system and soil depth. DOM humification, indicated by the humification index (HIX), increased significantly with depth (P < 0.05) and was higher for Ftill-W (2.95) than W-W (2.61) or Pg/O-W (2.28). Overall, DOM became depleted of plant-derived constituents and was enriched by more decomposed, condensed substances in Ftill-W, as compared to W-W or Pg/O-W soils. DOM composition is strongly affected by cropping intensity and such changes are important drivers controlling SOC accretion in arable soils.en_US
dc.titleBulk optical characterization of dissolved organic matter from semiarid wheat-based cropping systemsen_US
dc.typeArticleen_US
mus.citation.extentfirstpage40en_US
mus.citation.extentlastpage49en_US
mus.citation.journaltitleGeodermaen_US
mus.identifier.categoryEngineering & Computer Scienceen_US
mus.identifier.doi10.1016/j.geoderma.2017.06.029en_US
mus.relation.collegeCollege of Engineeringen_US
mus.relation.departmentCenter for Biofilm Engineering.en_US
mus.relation.departmentChemical & Biological Engineering.en_US
mus.relation.departmentChemical Engineering.en_US
mus.relation.universityMontana State University - Bozemanen_US
mus.relation.researchgroupCenter for Biofilm Engineering.en_US
mus.data.thumbpage8en_US


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