Separation of light and heavy organic matter fractions in soil — Testing for proper density cut-off and dispersion level

Cerli, Chiara; Celi, Luisella; Kalbitz, Karsten; Guggenberger, Georg; Kaiser, Klaus

doi:10.1016/j.geoderma.2011.10.009

Cited by 177 publications

(149 citation statements)

References 53 publications

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“…John et al 2005;Curaqueo 327 et al 2010;Cerli et al 2012), and this was also true in our study ( Table 2). The MOM fraction is 328 generally considered as the most stable since the chemical interaction between organic compounds 329 and the mineral soil phases protects OM from degradation (e.g.…”

Section: Discussion 257supporting

confidence: 87%

“…The total N 143 content was determined by combustion method, too. The density fractionation of SOM was 144 performed only on the samples collected in 2011, following Cerli et al (2012). Briefly, 125 ml of 145 Na-polytungstate (NaPT) solution with density 1.6 g cm -3 was added to 25 g of soil.…”

Section: Organic Carbon and Nitrogen Content And Density Fractionatiomentioning

confidence: 99%

“…After centrifugation at 5600 g for 20 min, 152 the light fraction released from aggregate breakdown (occluded particulate organic matter, oPOM) 153 was separated, washed, dried and finely ground as described above. Preliminary tests were 154 performed to select the appropriate sonication energy to release the whole pool of oPOM, while 155 avoiding contamination by minerals and release of organic-mineral complexes (Cerli et al 2012). 156…”

Section: Organic Carbon and Nitrogen Content And Density Fractionatiomentioning

confidence: 99%

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Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

et al. 2016

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This is the author's final version of the contribution published as:Belmonte, Sergio A; Celi, Luisella; Stanchi, Silvia; Said-Pullicino, Daniel; Zanini, Ermanno; Bonifacio, Eleonora. Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil. SOIL RESEARCH. 54 (7) AbstractVineyard soils are typically characterised by poor development, low organic matter content, steep slopes, and consequently a limited capacity of conservation of the organic matter which is weakly bound to the mineral soil phase. In such conditions, permanent grass may help the conservation of the soil quality. The aim of this work was to evaluate the effects of permanent grass vs. single autumn tillage on soil structure and organic matter dynamics in a hilly vineyard. In the periods 1994-1996 and 2010-2012 soil samples were collected three times per year, in different seasons. Aggregate stability analyses and organic matter fractionation were performed. The effects of grass cover on soil recovery capacity after tillage disturbance were slow. Slight increases in aggregate resistance and organic matter contents were visible after three years, and only after long-lasting permanent grass the two plots (permanent grass/previously tilled) showed great decrease of aggregate losses and increase of organic matter. Even a single tillage produced however an immediate decrease in aggregate resistance, while the amounts of organic matter remained unaffected. Organic matter, however, showed marked seasonal dynamics, which involved not only recently added organic matter fractions but also the mineral-associated pool. Tillage altered organic matter dynamics by preventing the addition of new material into the mineral-associated organic fractions and limiting the stabilization of aggregates.

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Section: Discussion 257supporting

confidence: 87%

Section: Organic Carbon and Nitrogen Content And Density Fractionatiomentioning

confidence: 99%

Section: Organic Carbon and Nitrogen Content And Density Fractionatiomentioning

confidence: 99%

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Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

et al. 2016

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“…Cerli et al (2012) também verificaram valores similares para a recuperação de C nas frações físicas pelo uso de solução de PTS com densidades de 1,8 e 2,0 kg dm -3 . Estudos sobre proteção física da MO em Latossolos brasileiros (Roscoe et al, 2001;Freixo et al, 2002b) também revelaram maiores concentrações de C na FLL em comparação à FLO, em decorrência do uso da solução de NaI 1,8 kg dm -3 .…”

Section: Palavrasunclassified

Eficiência De Soluções Densas No Fracionamento Físico Da Matéria Orgânica Do Solo

Conceição

Boeni

Bayer

et al. 2015

Rev. Bras. Ciênc. Solo

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“…Stability assessment is based on the notion that the lower energy needed for disaggregating soil samples into smaller compounds and particles, the lower the stability of the soil. The used ultrasonic energies per unit volume of soil suspension for partial or total aggregate disruption vary widely in a range from 7 to 5 350 J ml -1 (Cerli et al, 2012;Christensen, 1992;Schomakers et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Calibration of ultrasonic power output in water, ethanol and sodium polytungstate

Mentler¹,

Schomakers²,

Kloss³

et al. 2017

International Agrophysics

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Ultrasonic power is the main variable that forms the basis for many soil disaggregation experiments. Thus, a procedure for the rapid determination of this variable has been developed and is described in this article. Calorimetric experiments serve to measure specific heat capacity and ultrasonic power. Ultrasonic power is determined experimentally for deionised water, 30% ethanol and sodium polytungstate with a density of 1.6 g cm−3 and 1.8 g cm−3. All experiments are performed with a pre-selected ultrasonic probe vibration amplitude. Under these conditions, it was found that the emitted ultrasonic power was comparable in the four fluids. It is suggested, however, to perform calibration experiments prior to dispersion experiments, since the used fluid, as well as the employed ultrasonic equipment, may influence the power output.

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Separation of light and heavy organic matter fractions in soil — Testing for proper density cut-off and dispersion level

Cited by 177 publications

References 53 publications

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

Effects of permanent grass versus tillage on aggregation and organic matter dynamics in a poorly developed vineyard soil

Eficiência De Soluções Densas No Fracionamento Físico Da Matéria Orgânica Do Solo

Calibration of ultrasonic power output in water, ethanol and sodium polytungstate

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