Retention and loss of water extractable carbon in soils: Effect of clay properties

Nguyen, Trung-Ta; Marschner, Petra

doi:10.1016/j.scitotenv.2013.10.002

Cited by 21 publications

(5 citation statements)

References 24 publications

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“…In addition to fertilization, clay and soil moisture content are main factors in controlling DOC concentrations in the soil pore water (De Troyer et al, 2014). Clay is providing a large surface area for DOC sorption (Huang et al, 2019;Nguyen and Marschner, 2014;Singh et al, 2018), and, sorption of DOC onto clay is mostly irreversible (Avneri-Katz et al, 2017). Due to the occupation of binding sites, DOC sorption decrease with increasing organic carbon content (Bolan et al, 2011).…”

Section: Amounts Of Leached Docmentioning

confidence: 99%

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

Tiefenbacher

Weigelhofer

Klik

et al. 2020

Preprint

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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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Section: Amounts Of Leached Docmentioning

confidence: 99%

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

Tiefenbacher

Weigelhofer

Klik

et al. 2020

Preprint

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“…Similarly, in the 0.01 M NaNO 3 electrolyte condition, the increase was to the extent of 26.1, 63.3 and 55.1%, respectively (Table 4). High contents of native C might also reduce the amount of adsorbed DOC because organic matter would already occupy most of the available binding sites on the clay surfaces (Kaiser and Zech, 2000;Nguyen and Marschner, 2014;Vogel et al, 2014). However, DOC uptake might not be related to the native C contents in some instances where pedogenic oxide contents of soils appeared to be the more important factors controlling SSA and solute adsorption (Kahle et al, 2004).…”

Section: Effect Of Native C and Oxides On Doc Uptakementioning

confidence: 99%

Adsorption-desorption behavior of dissolved organic carbon by soil clay fractions of varying mineralogy

et al. 2016

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Soil clay minerals significantly influence the accumulation and stabilization of organic carbon (OC). However, the effect of interactions among phyllosilicate clay minerals, native OC and sesquioxides (Fe/Al oxides) on the adsorption-desorption of dissolved organic carbon (DOC) under different background electrolyte types and concentration is poorly understood. A set of batch adsorption-desorption experiments were conducted using pedogenic clays extracted from soils dominated by kaolinite-illite (Kaol-Ill), smectite (Smec) and allophane (Allo). The clay samples were sequentially treated to remove native OC and sesquioxides, and tested for adsorption-desorption of DOC under various solution conditions. All the experiments were conducted at pH 7 using water extractable fraction of OC from wheat residues. DOC adsorption increased with increasing background electrolyte concentration, and the presence of Ca 2+ significantly enhanced the uptake in comparison to Na + due to a possible cationic bridging effect. Under all electrolyte conditions, the maximum DOC adsorption capacity (Q max ) (mg g −1 ) of the soil clay fractions (SCF) maintained the order: Allo N Smec N Kaol-Ill. A similar order was also observed when the adsorption capacities were normalized to the specific surface area (SSA) of the SCFs (mg m −2 ). DOC adsorption showed a positive relationship with SSA, and sesquioxides and allophanic minerals provided the largest contributions to the SSA in the SCF. Removal of sesquioxides from the SCF resulted in a decrease in SSA and thus DOC adsorption, whereas removal of native OC increased the SSA and subsequent DOC adsorption. Because this study used pedogenic SCFs which represented soils formed in different environments instead of processed clays from geological deposits, it provided realistic information about the interaction of DOC with SCF in relation to their native OC and sesquioxide contents. It also revealed the importance of Ca 2+ in enhancing the carbon adsorption capacities of these SCFs.

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“…32 These soil factors, more specifically the Fe/Al content of native clay, limit the desorption of WEOC and subsequent leaching into subsurface drainage. 33 This is an important consideration as the loam soils typical of central Illinois are often high in clay content. 34 If an increase in terrestrial denitrification after long-term cover crop planting was to occur, allochthonous WEOC inputs would continue to be minimal and have a little positive impact on nitrate reduction in receiving aquatic environments.…”

Section: Introductionmentioning

confidence: 99%

Changes in Water-Extractable Organic Carbon with Cover Crop Planting under Continuous Corn Silage Production

Grebliunas

Armstrong

Perry

2016

Air, Soil and Water Research

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ABSTR ACT: Long-term row crop agricultural production has dramatically reduced the pool of soil organic carbon. The implementation of cover crops in Midwestern agroecosystems is primarily to reduce losses of nitrogenous fertilizers, but has also been shown to restore soil carbon stocks over time. If labile carbon within agricultural soils could be increased, it could improve soil health, and if mobilized into subsurface drainage, it may positively impact watershed biogeochemistry. We tested for potential differences in water-extractable organic carbon (WEOC) at two different soil profiles (0-5 cm and 5-20 cm) between plots planted with cereal rye/daikon radish (cover crop), corn, and zero control (no vegetation) within the Illinois State University Research and Teaching Farm. We also tested for potential differences in denitrification within the upper soil profile throughout the growing year. We modeled excitation-emission matrices from soil cores through parallel factor analysis. We found no difference in WEOC concentrations between each crop treatment (P = 0.2850), but concentrations of WEOC were significantly lower in the 5-20 cm profile than that in the upper (0-5 cm) profile (P = 0.0033). There was a significant increase in WEOC after each treatment in samples after cover crop termination. The parallel factor analysis model found humic and fulvic acids to be the dominant fractions of WEOC in all soils tested. Humic and fulvic acids accounted for ~70% and 30% of model variation. Denitrification rates did not differ across treatments (P = 0.3520), which is likely attributed to soil WEOC being in limiting quantities and in primarily recalcitrant fractions. After three years, cover crops do not appear to alter soil WEOC quantity and type. Restoring the availability of carbon within agricultural soils will not be a short-term fix, and fields will likely be a net carbon sink, contributing minimal labile carbon to receiving waterways.

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Retention and loss of water extractable carbon in soils: Effect of clay properties

Cited by 21 publications

References 24 publications

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

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

Adsorption-desorption behavior of dissolved organic carbon by soil clay fractions of varying mineralogy

Changes in Water-Extractable Organic Carbon with Cover Crop Planting under Continuous Corn Silage Production

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