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Open AccessFeature PaperArticle

Short-Term Effects of Fertilization on Dissolved Organic Matter in Soil Leachate

1
Institute for Land and Water Management Research, Federal Agency for Water Management, 3252 Petzenkirchen, Austria
2
Institute for Soil Physics and Rural Water Management, University of Natural Resources and Life Sciences, 1180 Vienna, Austria
3
WasserClusterLunz—Biologische Station GmbH, 3293 Lunz am See, Austria
4
Institute of Hydrobiology and Aquatic Ecosystem Management, University of Natural Resources and Life Sciences, 1180 Vienna, Austria
5
Institute of Agronomy, University of Natural Resources and Life Sciences, 3430 Tulln, Austria
6
Institute for Soil Research, University of Natural Resources and Life Sciences, 3430 Tulln, Austria
*
Author to whom correspondence should be addressed.
Water 2020, 12(6), 1617; https://doi.org/10.3390/w12061617
Received: 14 May 2020 / Revised: 29 May 2020 / Accepted: 4 June 2020 / Published: 5 June 2020
(This article belongs to the Special Issue Transformation of Dissolved Organic Matter in Aquatic Landscapes)
Besides the importance of dissolved organic matter (DOM) in soil biogeochemical processes, there is still a debate on how agricultural intensification affects the leaching of terrestrial DOM into adjacent aquatic ecosystems. In order to close this linkage, we conducted a short-term (45 day) lysimeter experiment with silt loam and sandy loam undisturbed/intact soil cores. Mineral (calcium ammonium nitrate) or organic (pig slurry) fertilizer was applied on the soil surface with a concentration equivalent to 130 kg N ha−1. On average, amounts of leached DOC over 45 days ranged between 20.4 mg (silt loam, mineral fertilizer) and 34.4 mg (sandy loam, organic fertilizer). Both, mineral and organic fertilization of a silt loam reduced concentration of dissolved organic carbon (DOC) in the leachate and shifted its composition towards a microbial-like signature (BIX) with a higher aromaticity (Fi) and a lower molecular size (E2:E3). However, in sandy loam only mineral fertilization affected organic matter leaching. There, lowered DOC concentrations with a smaller molecular size (E2:E3) could be detected. The overall effect of fertilization on DOC leaching and DOM composition was interrelated with soil texture and limited to first 12 days. Our results highlight the need for management measures, which prevent or reduce fast flow paths leading soil water directly into aquatic systems, such as surface flow, fast subsurface flow, or drainage water. View Full-Text
Keywords: Absorbance spectra; agricultural management; dissolved organic carbon (DOC); dissolved organic matter (DOM); fluorescence spectra; lysimeter; mineral; organic; soil pore water Absorbance spectra; agricultural management; dissolved organic carbon (DOC); dissolved organic matter (DOM); fluorescence spectra; lysimeter; mineral; organic; soil pore water
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MDPI and ACS Style

Tiefenbacher, A.; Weigelhofer, G.; Klik, A.; Pucher, M.; Santner, J.; Wenzel, W.; Eder, A.; Strauss, P. Short-Term Effects of Fertilization on Dissolved Organic Matter in Soil Leachate. Water 2020, 12, 1617. https://doi.org/10.3390/w12061617

AMA Style

Tiefenbacher A, Weigelhofer G, Klik A, Pucher M, Santner J, Wenzel W, Eder A, Strauss P. Short-Term Effects of Fertilization on Dissolved Organic Matter in Soil Leachate. Water. 2020; 12(6):1617. https://doi.org/10.3390/w12061617

Chicago/Turabian Style

Tiefenbacher, Alexandra; Weigelhofer, Gabriele; Klik, Andreas; Pucher, Matthias; Santner, Jakob; Wenzel, Walter; Eder, Alexander; Strauss, Peter. 2020. "Short-Term Effects of Fertilization on Dissolved Organic Matter in Soil Leachate" Water 12, no. 6: 1617. https://doi.org/10.3390/w12061617

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