the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Short-term effects of fertilization on dissolved organic matter (DOM) in soil leachate
Abstract. Besides the importance of dissolved organic matter (DOM) in soil biogeochemical processes, there is still a debate on how agricultural intensification affects the composition and concentration of dissolved organic matter leached from soils into adjacent aquatic ecosystems. In order to investigate the immediate response of DOM leaching to fertilization, we conducted a short-term (45 day) lysimeter experiment with undisturbed silt loam and loamy sand 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. After fertilization, soil leachate was collected in 6-days intervals. Dissolved organic carbon concentrations (DOC) were measured with gas chromatography, while shifts in DOM composition were analysed using absorbance and excitation- emission fluorescence indices from peak-picking as well as from PARAFAC analysis.
During the first 12 days, fertilization of a silt loam reduced DOC concentrations in the leachate and shifted its composition towards more microbial- like compounds. Additionally, the discrepancy in DOM composition between fertilizer and control treatments of a silt loam increased with time. However, in loamy sand only mineral fertilization affected organic matter leaching and decreased DOC concentrations in the leachate during the first 12 days. Furthermore, mineral fertilization of the loamy sand led to DOM compounds with low molecular size in the first 12 days. Our results show that fertilization tends to increase microbial transformed DOM, while it reduces leached DOC concentrations. Furthermore, the magnitude of fertilization on DOC concentrations and DOM composition was highly depending on the soil texture they originate from. However, in our set-up, the experimental soil units were restricted to a soil depth of 16 cm (Ap horizon). At ecosystem level, a sufficiently long soil passage might mitigate the impact of fertilization on soil DOM.
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RC1: 'comments', Anonymous Referee #1, 29 Jan 2020
- AC1: 'Response to referee 1', Alexandra Tiefenbacher, 07 Apr 2020
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RC2: 'Review comments', Anonymous Referee #2, 06 Mar 2020
- AC2: 'Response to referee 2', Alexandra Tiefenbacher, 07 Apr 2020
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RC1: 'comments', Anonymous Referee #1, 29 Jan 2020
- AC1: 'Response to referee 1', Alexandra Tiefenbacher, 07 Apr 2020
-
RC2: 'Review comments', Anonymous Referee #2, 06 Mar 2020
- AC2: 'Response to referee 2', Alexandra Tiefenbacher, 07 Apr 2020
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Cited
5 citations as recorded by crossref.
- Optimizing Carbon Sequestration in Croplands: A Synthesis A. Tiefenbacher et al. 10.3390/agronomy11050882
- Dissolved Organic Matter Quality and Biofilm Composition Affect Microbial Organic Matter Uptake in Stream Flumes G. Weigelhofer et al. 10.3390/w12113246
- Emerging investigator series: impacts of land use on dissolved organic matter quality in agricultural watersheds: a molecular perspective S. A. et al. 10.1039/D3EM00506B
- Investigating Near-Surface Hydrologic Connectivity in a Grass-Covered Inter-Row Area of a Hillslope Vineyard Using Field Monitoring and Numerical Simulations V. Krevh et al. 10.3390/land12051095
- The Characteristics of Dissolved Organic Matter and Soil Microbial Communities in the Soils of Larix principis-rupprechtii Mayr. Plantations in the Qinling Mountains, China H. Li et al. 10.3390/su141911968