Characterization of soil organic carbon pools by acid hydrolysis

Silveira, Maria L.; Comerford, N. B.; Reddy, K. R.; Cooper, William T.; El-Rifai, Hasan M.

doi:10.1016/j.geoderma.2008.01.002

Cited by 132 publications

(78 citation statements)

References 27 publications

(40 reference statements)

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“…Among the chemical methods, acid hydrolysis (Trumbore and Zheng 1996;Leavitt et al 1996;Paul et al 1997;Silveira et al 2008), and chemical oxidation by various oxidizing agents including hydrogen peroxide (H 2 O 2 ) (Theng et al 1999;Eusterhues et al 2005), disodium peroxodisulphate (Na 2 S 2 O 8 ) (Eusterhues et al 2003;Lorenz et al 2006), and sodium hypochlorite (NaOCl) Siregar et al 2005;Zimmermann et al 2007) have been used frequently. Both acid hydrolysis and chemical oxidation preferentially remove labile organic compounds such as proteins, nucleic acids, and polysaccharides and retain relatively stable SOC fraction that is enriched in alkyl and aromatic C components (Leavitt et al 1996;Paul et al 2001;Mikutta et al 2006).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of structural chemistry and isotopic signatures of refractory soil organic carbon fraction isolated by wet oxidation methods

et al. 2009

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Accurate quantification of different soil organic carbon (SOC) fractions is needed to understand their relative importance in the global C cycle. Among the chemical methods of SOC fractionation, oxidative degradation is considered more promising because of its ability to mimic the natural microbial oxidative processes in soil. This study focuses on detailed understanding of changes in structural chemistry and isotopic signatures of SOC upon different oxidative treatments for assessing the ability of these chemicals to selectively isolate a refractory fraction of SOC. Replicated sampling (to similar to 1 m depth) of pedons classified as Typic Fragiudalf was conducted under four land uses (woodlot, grassland, no-till and conventional-till continuous corn [Zea mays L.]) at Wooster, OH. Soil samples (< 2 mm) were treated with three oxidizing agents (hydrogen peroxide (H₂O₂), disodium peroxodisulfate (Na2S2O8) and sodium hypochlorite (NaOCl)). Oxidation resistant residues and the bulk soil from A1/Ap1 horizons of each land use were further analyzed by solid-state C-13 nuclear magnetic resonance (NMR) spectroscopy and accelerator mass spectrometry to determine structural chemistry and C-14 activity, respectively. Results indicated that, oxidation with NaOCl removed significantly less SOC compared to Na2S2O8 and H₂O₂. The NMR spectra revealed that NaOCl oxidation preferentially removed lignin-derived compounds at 56 ppm and at 110-160 ppm. On the other hand, the SOC resistant to Na2S2O8 and H₂O₂ oxidation were enriched with alkyl C groups, which dominate in recalcitrant macromolecules. This finding was corroborated by the C-14 activity of residual material, which ranged from -542 to -259aEuro degrees for Na2S2O8 resistant SOC and -475 to -182aEuro degrees for H₂O₂ resistant SOC as compared to relatively greater C-14 activity of NaOCl resistant residues (-47 to 61aEuro degrees). Additionally, H₂O₂ treatment on soils after light fraction removal was more effective in isolating the oldest (C-14 activity of -725 to -469aEuro degrees) SOC fraction. The Delta C-14 signature of SOC removed by different oxidizing agents, calculated by mass balance, was more or less similar irrespective of the difference in labile SOC removal efficiency. This suggests that SOC isolated by many fractionation methods is still a mixture of much younger and older material and therefore it is very important that the labile SOC should be completely removed before measuring the turnover time of stable and refractory pools of SOC

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Section: Introductionmentioning

confidence: 99%

Evaluation of structural chemistry and isotopic signatures of refractory soil organic carbon fraction isolated by wet oxidation methods

et al. 2009

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“…The depletion of the SOC pool leads to a downfall in the soil quality and productivity (Lal, 2001). SOC consists of several pools, namely active, slow and passive, with differential turnover rate ranging from months to over several hundred to thousands years (Silveira et al, 2008). The details are given below.…”

Section: Soil Carbon Dynamicsmentioning

confidence: 99%

The CENTURY Model as a Tool to Study Soil Carbon Dynamics of Coconut Ecosystem in the Western Zone of Tamil Nadu, India

Davis¹,

Panneerselvam²,

Subramanian³

et al. 2017

Int.J.Curr.Microbiol.App.Sci

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“…To be sequestrated, SOC should be converted from the active pools to less reactive intermediate or passive pools, and, consequently, sustained in the soil for decades or longer (Silveira et al, 2008). As SOM is a heterogeneous mixture of organic substances with different composition and lability (turnover time), it has been convenient to partition the organic carbon content of a soil into different pools (Chan et al, 2002): a) labile SOM -a quickly reactive labile organic matter, which provides energy and nutrients for soil microorganisms and releases part of the nutrients for plant usage; its half-life is between days and few years; b) stable SOM -a reservoir of less decomposable organic matter.…”

Section: Evaluation Of Soil Organic Carbon Stability In Grasslands Ofmentioning

confidence: 99%

Evaluation of soil organic carbon stability in grasslands of protected areas and arable lands applying chemo-destructive fractionation

Liaudanskienė

Šlepetienė

Šlepetys

et al. 2013

Zemdirbyste-Agriculture

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The soils of Natura 2000 protected areas (Endocalcari-Endohypergleyic Cambisols, Fluvi-Eutric Fluvisol and Endohypogleyi-Eutric Fluvisols) and agrarian lands overgrown with grasses (Endocalcari-Endohypogleyic Cambisols) were investigated in this research in 2012. The soil organic carbon (SOC) concentrations decreased with the depth in all treatments, and the highest values were measured at 0-10 cm soil layer in pre-mainland section of middle reaches of the Nevėžis (76.8 g kg -1 ) and in old semi-natural pasture (49.5 g kg -1 ). The exclusive importance of the agrarian soil occupied with grasslands and long-lived swards and soils of protected areas occupied with natural meadows for environmental quality was revealed, because organic carbon was accumulated and sequestrated in the form of stable compounds. Natural encroachment of wood pasture by forest plant communities in the northern part of Klamputė wood pasture significantly increased SOC. The content of SOC was higher in all soil layers in wood pasture under restoration compared with surviving wood pasture. The carbon transformation processes in wood pastures differed depending on the depth: organic carbon was more stabilized in the 10-20 and 20-30 cm layers in the surviving wood pasture than that in wood pasture under restoration. It was established that the most intensive transformation and accumulation of organic carbon take place at 0-10 cm soil layer. The soils of protected areas and agricultural lands were characterized by differences in organic carbon stability. After applying the method of chemo-destructive fractionation the largest amount of residual organic carbon, which represents the resistance to degradation and the possibility to sequestration, was established in the soils under long-term use of grassland (pre-mainland section and old semi-natural pasture). The most unfavourable status of SOC, and thus all the soil organic matter (SOM), is observed in the riverside section. The labile carbon was dominant there, and the content of organic carbon resistant to chemo-destruction was very low in all soil layers.

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Characterization of soil organic carbon pools by acid hydrolysis

Cited by 132 publications

References 27 publications

Evaluation of structural chemistry and isotopic signatures of refractory soil organic carbon fraction isolated by wet oxidation methods

Evaluation of structural chemistry and isotopic signatures of refractory soil organic carbon fraction isolated by wet oxidation methods

The CENTURY Model as a Tool to Study Soil Carbon Dynamics of Coconut Ecosystem in the Western Zone of Tamil Nadu, India

Evaluation of soil organic carbon stability in grasslands of protected areas and arable lands applying chemo-destructive fractionation

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