Amount and composition of clay-associated soil organic matter in a range of kaolinitic and smectitic soils

Wattel-Koekkoek, E.J.W.; Genuchten, P.P.L van; Buurman, P.; Lagen, Barend van

doi:10.1016/s0016-7061(00)00062-8

Cited by 241 publications

(123 citation statements)

References 17 publications

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“…In our study, variation in SOC quality cannot be easily explained by variation in clay mineralogy (Wattel-Koekkoek et al, 2001;Rasmussen et al, 2006). Across our sites, low SOC decomposition rates occurred at sites with high MAT where clay minerals have a lower affinity for SOc.…”

Section: Soc Quality and Matmentioning

confidence: 49%

Temperature and vegetation effects on soil organic carbon quality along a forested mean annual temperature gradient in North America

Fissore

Giardina

Kolka

et al. 2007

Global Change Biology

138

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Both climate and plant species are hypothesized to influence soil organic carbon (SOC) quality, but accurate prediction of how SOC process rates respond to global change will require an improved understanding of how SOC quality varies with mean annual temperature (MAT) and forest type. We investigated SOC quality in paired hardwood and pine stands growing in coarse textured soils located along a 22 DC gradient in MAT. To do this, we conducted SO-day incubation experiments at 10 and 30 DC to quantify SOC decomposition rates, which we used to kinetically define SOC quality. We used these experiments to test the hypotheses that SOC quality decreases with MAT, and that SOC quality is higher under pine than hardwood tree species. We found that both SOC quantity and quality decreased with increasing MAT. During the 30 DC incubation, temperature sensitivity (QI0) values were strongly and positively related to SOC decomposition rates, indicating that substrate supply can influence temperature responsiveness of SOC decomposition rates. For a limited number of dates, QI0 was negatively related to MAT. Soil chemical properties could not explain observed patterns in soil quality. Soil pH and cation exchange capacity (CEC) both declined with increasing MAT, and soil C quality was positively related to pH but negatively related to CEC. Clay mineralogy of soils also could not explain patterns of SOC quality as complex (2: 1), high CEC clay minerals occurred in cold climate soils while warm climate soils were dominated by simpler (1: 1), low CEC clay minerals. While hardwood sites contained more SOC than pine sites, with differences declining with MAT, clay content was also higher in hardwood soils. In contrast, there was no difference in SOC quality between pine and hardwood soils. Overall, these findings indicate that SOC quantity and quality may both decrease in response to global warming, despite long-term changes in soil chemistry and mineralogy that favor decomposition.

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Section: Soc Quality and Matmentioning

confidence: 49%

Temperature and vegetation effects on soil organic carbon quality along a forested mean annual temperature gradient in North America

Fissore

Giardina

Kolka

et al. 2007

Global Change Biology

138

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“…Organic matter in sediment is primarily associated with clay minerals as a result of several processes, including adsorption, bounding, and intercalation (Wattel-Koekkoek et al, 2001). The storage of organic matter within the interlayer space of layered silicates, which is an important type of clay-organic association in soil, has been proposed and confirmed by previous studies Theng, 1974;Theng et al, 1986).…”

Section: Introductionmentioning

confidence: 54%

“…First, it contains amino and carboxyl groups and alkyl chains with moderate numbers of carbon atoms. These groups are common in natural organics (Wattel-Koekkoek et al, 2001), such as amino acids and fatty acids. Amino acids are able to transform into macromolecule by condensation polymerization, and become the precursor of oil and gas.…”

Section: Introductionmentioning

confidence: 99%

Thermal degradation of organic matter in the interlayer clay–organic complex: A TG-FTIR study on a montmorillonite/12-aminolauric acid system

Liu

Yuan

Qin

et al. 2013

Applied Clay Science

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“…To evaluate the catalytic activity of cation-exchanged montmorillonite with different solid acidities in hydrocarbon generation, thermal decomposition experiments of typical organic matter were conducted in the presence of montmorillonite. 12-aminolauric acid (ALA; NH 2 (CH 2 ) 11 COOH) was selected as the organic model because it contains some common functional groups of natural organics, such as amino and carboxyl groups, and represents some types of natural organics (Wattel-Koekkoek et al 2001). The catalytic activity was investigated by the thermal decomposition temperature of ALA, which was obtained by thermogravimetric (TG) and derivative TG (DTG) analysis.…”

Section: Introductionmentioning

confidence: 99%

Studies on the solid acidity of heated and cation-exchanged montmorillonite using n-butylamine titration in non-aqueous system and diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy

Liu

Yuan

et al. 2013

Phys Chem Minerals

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The effects of heating and cation exchange on the solid acidity of montmorillonite were investigated using n-butylamine titration in non-aqueous system and diffuse reflectance Fourier transform infrared spectroscopy. The number of total, Brønsted, and Lewis acid sites showed the same modulation tendency with increasing heating temperature, reaching a maximum at 120°C and subsequently decreasing until it reaches a minimum at 600°C. The Lewis acid sites result from unsaturated Al 3? cations, and their number increased with the heating temperature due to the dehydration and dehydroxylation of montmorillonite. The generation and evolution of Brønsted acidity were mainly related to interlayer-polarized water molecules. Water adsorbed on the unsaturated Al 3? ions also acted as a Brønsted acid. The acid strength of the Brønsted acid sites was dependent on the polarization ability of the exchangeable cation, the amount of interlayer water, and the degree of dissociation of the interlayer water coordinated to exchangeable cations. All cation-exchanged montmorillonites exhibited different numbers of acid sites and various distributions of acid strength. Brønsted acidity was predominant in Al 3? -exchanged montmorillonite, whereas the Na ? -and K ? -exchanged montmorillonites showed predominantly Lewis acidity. Moreover, Mg 2? -and Li ? -exchanged montmorillonites exhibited approximately equal numbers of Brønsted and Lewis acid sites. The Brønsted acidity of cation-exchanged montmorillonite was positively correlated with the charge-to-radius ratios of the cations, whereas the Lewis acidity was highly dependent on the electronegativity of the cations. The acid strengths of Al 3? -and Mg 2? -exchanged montmorillonites were remarkably higher than those of monovalent cationexchanged montmorillonites, showing the highest acid strength (H 0 B -3.0). Li ? -and Na ? -exchanged montmorillonites exhibited an acid strength distribution of -3.0 \ H 0 B 4.8, with the acid strength ranging primarily from 1.5 to 3.3 in Li ? -exchanged montmorillonite, whereas only weaker-strength acid sites (1.5 \ H 0 B 4.8) were present in K ? -exchanged montmorillonite. The results of the catalysis experiments indicated that montmorillonite promoted the thermal decomposition of the model organic. The catalytic activity showed a positive correlation with the solid acidity of montmorillonite and was affected by cation exchange, which occurs naturally in geological processes.

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Amount and composition of clay-associated soil organic matter in a range of kaolinitic and smectitic soils

Cited by 241 publications

References 17 publications

Temperature and vegetation effects on soil organic carbon quality along a forested mean annual temperature gradient in North America

Temperature and vegetation effects on soil organic carbon quality along a forested mean annual temperature gradient in North America

Thermal degradation of organic matter in the interlayer clay–organic complex: A TG-FTIR study on a montmorillonite/12-aminolauric acid system

Studies on the solid acidity of heated and cation-exchanged montmorillonite using n-butylamine titration in non-aqueous system and diffuse reflectance Fourier transform infrared (DRIFT) spectroscopy

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