Modelling how carbon affects soil structure

Malamoud, Karim; McBratney, Alex B.; Minasny, Budiman; Field, Damien J.

doi:10.1016/j.geoderma.2008.10.018

Cited by 55 publications

(38 citation statements)

References 23 publications

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“…According to Curaqueo et al (2010), the soil structure involves the shape, degree and size of the aggregates, consequently this property regulates the porosity, and therefore, the retention and availability of water, in addition to its capacity to contain air, as well as the growth of crop roots. The water retention capacity in the soil depends on the number of pores, the pore size distribution and specific surface area of each floor (Malamoud et al, 2009). Therefore, the MOS generally has a positive effect on the ability to retain water (Thierfelder and Wall, 2009), although the synergistic effect of MOS on these and other properties is not entirely clear (Malamoud et al, 2009).…”

Section: Resultsmentioning

confidence: 99%

“…The water retention capacity in the soil depends on the number of pores, the pore size distribution and specific surface area of each floor (Malamoud et al, 2009). Therefore, the MOS generally has a positive effect on the ability to retain water (Thierfelder and Wall, 2009), although the synergistic effect of MOS on these and other properties is not entirely clear (Malamoud et al, 2009). …”

Section: Resultsmentioning

confidence: 99%

“…Según Curaqueo et al (2010), la estructura del suelo involucra la forma, grado y tamaño de los agregados, en consecuencia esta propiedad regula la porosidad, y por lo tanto, la retención y disponibilidad de agua, además de su capacidad para contener aire, así como el crecimiento de las raíces de los cultivos. La capacidad de retención de agua en el suelo depende del número de poros, de la distribución de tamaño de poros y de la superficie específica de cada suelo (Malamoud et al, 2009). Por lo tanto, la MOS generalmente tiene un efecto positivo sobre la capacidad de retención de agua (Thierfelder y Wall, 2009), aunque el efecto sinérgico de la MOS sobre ésta y otras propiedades no es totalmente claro (Malamoud et al, 2009).…”

Section: Resultsunclassified

“…La capacidad de retención de agua en el suelo depende del número de poros, de la distribución de tamaño de poros y de la superficie específica de cada suelo (Malamoud et al, 2009). Por lo tanto, la MOS generalmente tiene un efecto positivo sobre la capacidad de retención de agua (Thierfelder y Wall, 2009), aunque el efecto sinérgico de la MOS sobre ésta y otras propiedades no es totalmente claro (Malamoud et al, 2009).…”

Section: Resultsunclassified

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Uso de compostas para mejorar la fertilidad de un suelo Luvisol de ladera

Cruz

Hernandez

Chaparro

et al. 2017

Remexca

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El objetivo de la investigación fue evaluar los cambios en las propiedades físicas y químicas debido al aporte de 0, 20, 40 y 60 Mg ha-1 de composta en un Luvisol crómico de ladera, en condiciones de trópico húmedo. Se estableció un experimento en bloques completamente al azar con cuatro repeticiones. Los resultados indican que las dosis mayores a 40 Mg ha-1 de composta incrementan la porosidad y la conductividad hidráulica, reducen la densidad aparente y la resistencia a la penetración en la capa superficieal (-10 cm). El tamaño y estabilidad de los agregados se reducen conforme al incremento en la dosis de composta, lo que se interpreta como una etapa intermedia, de un rápido proceso de agregación-desagregación-agregación. El aporte más de 40 Mg ha-1 de la enmienda orgánica modificaron los niveles de materia organica, capacidad de intercambio catiónico y porcentaje de saturación de bases, solamente se registraron ligeros incrementos en K, Ca, Mg, Fe y Zn, y no se observaron cambios en el pH.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsunclassified

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Uso de compostas para mejorar la fertilidad de un suelo Luvisol de ladera

Cruz

Hernandez

Chaparro

et al. 2017

Remexca

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“…It is also of local importance as it describes ecosystem function, soil fertility, water holding capacity, stabilizing soil aggregates and other many functions (The GEFSOC project team 2006). The SOC turnover models have also taken on the prediction of the impact of climate change to SOC turnover on a global scale (Jones et al 2005), spatial mapping of national SOC stock (van Wasemael et al 2010;Meersmans et al 2011), assessing the future carbon sequestration at national and watershed scale (Webb et al 2003;Milne et al 2007;Schulp et al 2008;Smith et al 2009;Yokozawa et al 2010), proposing agricultural management practices at the field scale (Liang et al 2008), and modeling stabilization mechanism of soil structure at the micro scale (Malamoud et al 2009). Beyond this, SOC turnover models are vital tools for describing ecosystem functions, therefore, establishment and/or purpose-upgrading of SOC models to fit specific environmental conditions are an essential part as a bridge between the local scale and global scale.…”

Section: Introductionmentioning

confidence: 99%

Phosphate adsorption coefficient can improve the validity of RothC model for Andosols

Takata

Ito

Ohkura

et al. 2011

Soil Science and Plant Nutrition

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The conventionally-modified RothC model for Andosols required pyrophosphate-extractable aluminum (Alp) for changing humus decomposition rate of the original RothC model. However, any Japanese soil database, which were derived from national soil survey projects, did not have the Alp dataset, and thus the conventionally-modified RothC model required Alp prediction from soil organic carbon (SOC) content. From this reason, there is a risk of Alp prediction error in the run-up to predict the SOC turnover. Objectives of this study were (1) to explore the alternative soil property for re-modifying the conventionally-modified RothC model and (2) to validate the re-modified model against long-term experimental data sets of Japanese Andosols. Phosphate adsorption coefficient (PAC), which is an indicator of the content of amorphous aluminum (Al) and iron (Fe) compounds, was tested to replace Alp using three Andosols database. A stability factor, H(f), was defined as the factor needed to divide the decomposition rate constant of the humus pool so that the modeled SOC level matched the measured level. Phosphate adsorption coefficient showed positive correlation with the H(f). The H(f) was regressed by the exponential equation using PAC as an independent variable, and its R 2 value was higher than in the Alp derived regression. We incorporated the PAC derived regression into the original RothC model as the PAC-modified RothC model. From the comparison of the models validity, the PAC-modified RothC model showed low mean error with low root mean square error in the long-term experimental data sets. These results indicate that PAC can replace Alp for changing the decomposition rate of humus pool in RothC model with accuracy enhancement.

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Microaggregates in soils

Totsche

Amelung

Gerzabek

et al. 2017

J. Plant Nutr. Soil Sci.

712

439

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All soils harbor microaggregates, i.e., compound soil structures smaller than 250 μm. These microaggregates are composed of diverse mineral, organic and biotic materials that are bound together during pedogenesis by various physical, chemical and biological processes. Consequently, microaggregates can withstand strong mechanical and physicochemical stresses and survive slaking in water, allowing them to persist in soils for several decades. Together with the physiochemical heterogeneity of their surfaces, the three-dimensional structure of microaggregates provides a large variety of ecological niches that contribute to the vast biological diversity found in soils. As reported for larger aggregate units, microaggregates are composed of smaller building units that become more complex with increasing size. In this context, organo-mineral associations can be considered structural units of soil aggregates and as nanoparticulate fractions of the microaggregates themselves. The mineral phases considered to be the most important as microaggregate forming materials are the clay minerals and Fe-and Al-(hydr)oxides. Within microaggregates, minerals are bound together primarily by physicochemical and chemical interactions involving cementing and gluing agents. The former comprise, among others, carbonates and the short-range ordered phases of Fe, Mn, and Al. The latter comprise organic materials of diverse origin and probably involve macromolecules and macromolecular mixtures. Work on microaggregate structure and development has largely focused on organic matter stability and turnover. However, little is known concerning the role microaggregates play in the fate of elements like Si, Fe, Al, P, and S. More recently, the role of microaggregates in the formation of microhabitats and the biogeography and diversity of microbial communities has been investigated. Little is known regarding how microaggregates and their properties change in time, which strongly limits our understanding of micro-scale soil structure dynamics. Similarly, only limited information is available on the mechanical stability of microaggregates, while essentially nothing is known about the flow and transport of fluids and solutes within the micro-and nanoporous microaggregate systems. Any quantitative approaches being developed for the modeling of formation, structure and properties of microaggregates are, therefore, in their infancy. We respond to the growing awareness of the importance of microaggregates for the structure, properties and functions of soils by reviewing what is currently known about the formation, composition and turnover of microaggregates. We aim to provide a better understanding of their role in soil function, and to present the major unknowns in current microaggregate research. We propose a harmonized concept for aggregates in soils that explicitly considers the structure and build-up of microaggregates and the role of organo-mineral associations. We call for experiments, studies and modeling endeavors that will link informatio...

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Modelling how carbon affects soil structure

Cited by 55 publications

References 23 publications

Uso de compostas para mejorar la fertilidad de un suelo Luvisol de ladera

Uso de compostas para mejorar la fertilidad de un suelo Luvisol de ladera

Phosphate adsorption coefficient can improve the validity of RothC model for Andosols

Microaggregates in soils

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