Organic acid behaviour in a calcareous soil: sorption reactions and biodegradation rates

Ström, Lena; Owen, Andrew; Godbold, Douglas L.; Jones, Davey L.

doi:10.1016/s0038-0717(01)00146-8

Cited by 142 publications

(83 citation statements)

References 33 publications

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“…Such findings are likely to be significant only in calcareous soils, such as the soil used in this experiment. However, the implication of these finding are widespread because 30% of the world's soil is calcareous (Strom et al 2001). Studies on the effect of soil carbonates on the sorption of anionic heavy metals and plant nutrients concluded that sorption occurred between carbonate minerals and anions (Wullstein 1969;Goldberg and Glaubig 1988;Tunesi et al 1999).…”

Section: Discussionmentioning

confidence: 99%

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Gaultier¹,

Farenhorst²,

Crow³

2006

Can. J. Soil. Sci.

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Gaultier, J., Farenhorst, A. and Crow, G. 2006. Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth. Can. J. Soil Sci. 86: 89-95. Since pesticide fate and leaching models increasingly incorporate spatial variability, the objective of this study was to quantify the variability of soil properties and 2,4-D sorption within a hummocky field as affected by landscape position and soil depth. Seventy-two soil cores collected at 5-m intervals along a transect were segmented by soil horizon (A, B and C) and landscape position (upper, mid, lower and depression). As expected, soil organic carbon content significantly decreased, and soil pH and soil carbonate content significantly increased with soil depth, while clay content was significantly greater in the B horizon than the A and C horizon. Soils from the depressional area generally had higher soil organic carbon content, soil carbonate content, clay content and soil pH than soil samples from other slope positions. The sorption of 2,4-D by soil was positively correlated with soil organic matter content and negatively correlated with soil carbonate content. These soil properties and herbicide sorption varied along the transect and with soil depth. Regardless of whether or not the landscape was segmented by landscape position, for both the A and C horizon, predictions of 2,4-D sorption by soil were generally good using simple regression models that contained soil organic carbon content and carbonate content as the only parameters. However, for the B horizon, the prediction of 2,4-D sorption by soil was very poor when all sampling points along the transect were considered, but greatly improved for the mid-and depressional slope positions when soils were segmented by landscape position. We conclude that segmentation by slope position could be a useful additional tool when predicting pesticide fate and leaching at the large-scale. As well, the negative association between soil carbonate content and 2,4-D sorption warrants further attention as a large portion of Canadian agriculture encompasses calcareous soils. . Comme il fallait s'y attendre, la teneur en carbone organique diminue significativement alors que le pH et la concentration de carbonates augmentent significativement avec la profondeur; parallèlement, il y a sensiblement plus d'argile dans l'horizon B que dans les horizons A et C. Le sol des dépressions contient généralement plus de carbone organique, de carbonates et d'argile que le sol prélevé ailleurs sur la pente et son pH est plus élevé. La sorption du 2,4-D par le sol présente une corrélation positive avec la concentration de matière organique et une autre, négative, avec la concentration de carbonates. Ces propriétés du sol et la sorption de l'herbicide varient avec l'emplacement le long du transect et la profondeur. Les modèles à régression simple n'ayant pour seuls paramètres que la concentration de carbone organique et de carbonates prévoient généralement bien la sorption du 2,4-D p...

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Section: Discussionmentioning

confidence: 99%

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Gaultier¹,

Farenhorst²,

Crow³

2006

Can. J. Soil. Sci.

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“…Organic acids can react abiotically with carbonate sediment minerals and solubilize P i through a number of mechanisms. First, the organic anion may displace P i on adsorption sites on minerals and organic matter or decrease the total amount of adsorption sites available (Jones 1998;Ryan et al 2001;Strom et al 2001). Second, the organic anion may chelate metal and carbonate dissolution end products, such as Ca 2+ ions, that would otherwise immobilize P i (Knight et al 1992;Kirk 1999;Strom et al 2001).…”

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confidence: 99%

The role of organic acid exudates in liberating phosphorus from seagrass‐vegetated carbonate sediments

Long

McGlathery

Zieman

et al. 2008

Limnology & Oceanography

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Sediment-bound phosphorus (P) is a potential nutrient source for P-limited seagrasses inhabiting carbonate sediments. We explored the role of organic acid (OA) exudation by seagrasses in liberating mineral P from carbonate sediments. Organic acids can act to increase available P by dissolving carbonate sediment, competing with P for binding sites and complexing dissolution end products, and also by fueling microbial processes that change pore-water pH. We used dialysis tubing placed around individual roots in situ to quantify dissolved species immediately adjacent to roots (root zone) and compared these to bulk pore-water concentrations in vegetated and nonvegetated sediments. Total OA concentrations were highest in the root zone (29.8 6 1.8 mmol L 21 ) compared to bulk measures of 15.5 6 1.9 and 7.5 6 0.6 mmol L 21 in vegetated and nonvegetated sediments, respectively. Phosphate concentrations were also highest in the root zone and were linearly related to OA concentrations (R 2 5 0.63). Organic acid concentrations increased along a seagrass productivity gradient, and ratios of OA concentrations to productivity showed a significant response to a gradient in P-limitation of seagrasses. Organic acid concentrations found in and around roots, compared to those found in bulk sediment measures, indicate that seagrasses are a significant source of OA. Sampling at small spatial scales (mm) immediately adjacent to the roots is critical, because bulk sediment pore-water measures did not capture the observed fluctuations caused by the rapid reaction and consumption of OA in the sediment. Root-zone processes can liberate considerable quantities of P, and OA exudates likely contribute significantly to the success of T. testudinum in P-limited environments.

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“…Strom et al (2001) measured the sorption of organic acid for 60 min and observed that all citrate, malate and oxalate were sorbed to the soil in less than 5 min.…”

Section: Effect Of P Citrate Sorptionmentioning

confidence: 99%

Competitive sorption and desorption of phosphate and citrate in clayey and sandy loam soils

Souza

Soares²,

Silva³

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe increase of organic acids in soils can reduce phosphorus sorption. The objective of the study was to evaluate the competitive sorption of P and citrate in clayey and sandy loam soils, using a stirred-flow system. Three experiments were performed with soil samples (0-20 cm layer) of clayey (RYL-cl) and sandy loam (RYL-sl) Red Yellow Latosols (Oxisols). In the first study, the treatments were arranged in a 2 × 5 factorial design, with two soil types and five combinations of phosphorus and citrate application (only P; P + citrate; and citrate applied 7, 22, 52 min before P); in the second, the treatments were arranged in a 2 × 2 factorial design, corresponding to two soils and two forms of P and citrate application (only citrate and citrate + P); and in the third study, the treatments in a 2 × 2 × 6 factorial design consisted of two soils, two extractors (citrate and water) and six incubation times. In the RYL-cl and RYL-sl, P sorption was highest (44 and 25 % of P application, respectively), in the absence of citrate application. Under citrate application, P sorption was reduced in all treatments. The combined application of citrate and P reduced P sorption to 25.8 % of the initially applied P in RYL-cl and to 16.7 % in RYL-sl, in comparison to P without citrate. Citrate sorption in RYL-cl and RYL-sl was highest in the absence of P application, corresponding to 32.0 and 30.2 % of the citrate applied, respectively. With P application, citrate sorption was reduced to 26.4 and 19.7 % of the initially applied citrate in RYL-cl and RYL-sl, respectively. Phosphorus desorption was greater when citrate was used. Phosphorus desorption with citrate and water was higher in the beginning (until 24 h of incubation of P) in RYL-cl and RYL-sl, indicating a rapid initial phase, followed by a slow release phase. This suggests that according to the contact time of P with the soil colloids, the previously adsorbed P can be released to the soil solution in the presence of O aumento de ácidos orgânicos pode induzir à redução da sorção de P em solos. Este trabalho objetivou avaliar a sorção competitiva de P e citrato em solos de textura muito argilosa e franco-arenosa, utilizando o sistema de fluxo contínuo (stirred-flow). Foram realizados três experimentos com amostras da camada de 0-20 cm de dois Latossolos VermelhoAmarelo, texturas muito argilosa (LVA_arg) e franco-arenosa (LVA_fa). No primeiro, os tratamentos foram definidos por fatorial 2 × 5, sendo dois solos e cinco configurações de aplicação de P e citrato no solo (apenas P, P + citrato e citrato 7, 22, 52 min antes do P); no segundo, os tratamentos foram determinados por fatorial 2 × 2, dois solos e duas formas de aplicação de P e citrato no solo (apenas citrato, citrato + P); e, no terceiro, os tratamentos foram definidos segundo um fatorial 2 × 2 × 6, sendo dois solos, dois extratores (citrato e água) e os seis períodos de incubação. O valor máximo da sorção de P no LVA_arg e LVA_fa foi observado na testemunha sem aplicação de citrato, correspondendo a 44 e 25 % ...

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Organic acid behaviour in a calcareous soil: sorption reactions and biodegradation rates

Cited by 142 publications

References 33 publications

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

Spatial variability of soil properties and 2,4-D sorption in a hummocky field as affected by landscape position and soil depth

The role of organic acid exudates in liberating phosphorus from seagrass‐vegetated carbonate sediments

Competitive sorption and desorption of phosphate and citrate in clayey and sandy loam soils

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