Dependence of carbon and nitrogen mineralization rates upon amorphous metallic constituents and allophanes in highland soils

Boudot, Jean‐Pierre; Brahim, Ali Bel Hadj; Chone, Thérèse

doi:10.1016/0016-7061(88)90004-3

Cited by 36 publications

(9 citation statements)

References 14 publications

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“…In addition, non-crystalline Al phases which are assessed by oxalate extraction (Wada, 1989) may contribute to OC stabilization through complexation with polymeric Al or attachment to poorly crystalline aluminosilicates via hydroxyl groups (Shoji et al, 1982;Boudot et al, 1989;Chorover et al, 2004;Kleber et al, 2005;Mikutta et al, 2006). A strong correlation was found between contents of Fe o and OC contents of the clay fraction with soil formation (Fig.…”

Section: Evolution Of Mineral Surface Area and Organic Coverage Of CLmentioning

confidence: 85%

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

Dümig

Häusler

Steffens

et al. 2012

Geochimica et Cosmochimica Acta

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Section: Evolution Of Mineral Surface Area and Organic Coverage Of CLmentioning

confidence: 85%

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

Dümig

Häusler

Steffens

et al. 2012

Geochimica et Cosmochimica Acta

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“…Protective eff ects of amorphous aluminum, iron, and allophanic material have been shown to contribute to the much higher SOM concentrations found in these types of soils (Munevar and Wollum, 1977;Boudot el al., 1986;Martin and Haider, 1986;McKeague et al, 1986). Th e characteristics that cause SOM accumulation are also likely responsible for the minimal loss of SOC on incubation (Boudot et al, 1988). Respiration rates declined over time in all the soils with the diff erences in respiration rates between temperatures still apparent at the end of the incubation.…”

Section: Discussionmentioning

confidence: 96%

The Role of Soil Characteristics on Temperature Sensitivity of Soil Organic Matter

Haddix

Plante

Conant

et al. 2011

Soil Science Soc of Amer J

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T emperature is an important factor controlling SOM turnover and understanding how temperature aff ects SOM decomposition will allow us to better predict how global climate change will aff ect SOM stocks. Understanding the temperature sensitivity of SOM decomposition is challenging because SOM is composed of many diff erent organic C compounds, with diff ering inherent kinetic properties (Davidson and Janssens, 2006). To simplify the process of modeling SOM decomposition, this range of compounds is usually classifi ed into a small number of discrete, kinetically defi ned pools with some portion of SOM being easily decomposable and the rest comprising one or more other pools decomposing more slowly.In most decomposition models, temperature eff ects are modeled as a decomposition rate multiplier for fi xed SOM pools (Lloyd and Taylor, 1994;Del Grosso et al., 2005), but some recent studies have hypothesized that temperature may actually alter the amount of substrate that would be considered easily decomposable (Zogg et al., 1997;Zak et al., 1999;Dalias et al., 2003;Rasmussen et al., 2006). Th e most broadly used terrestrial C models typically have a fi xed Q 10 of 1.5 to 2.0 or an Arrhenius-type function with the same respiration-temperature relationship to each of the diff erent SOM pools (Melillo et al., 1995;Burke et al., 2003;Friedlingstein et al., 2006 Th e uncertainty associated with how projected climate change will aff ect global C cycling could have a large impact on predictions of soil C stocks. Th e purpose of our study was to determine how various soil decomposition and chemistry characteristics relate to soil organic matter (SOM) temperature sensitivity. We accomplished this objective using long-term soil incubations at three temperatures (15, 25, and 35°C) and pyrolysis molecular beam mass spectrometry (py-MBMS) on 12 soils from 6 sites along a mean annual temperature (MAT) gradient (2-25.6°C). Th e Q 10 values calculated from the CO 2 respired during a long-term incubation using the Q 10-q method showed decomposition of the more resistant fraction to be more temperature sensitive with a Q 10-q of 1.95 ± 0.08 for the labile fraction and a Q 10-q of 3.33 ± 0.04 for the more resistant fraction. We compared the fi t of soil respiration data using a two-pool model (active and slow) with fi rst-order kinetics with a three-pool model and found that the two and three-pool models statistically fi t the data equally well. Th e three-pool model changed the size and rate constant for the more resistant pool. Th e size of the active pool in these soils, calculated using the two-pool model, increased with incubation temperature and ranged from 0.1 to 14.0% of initial soil organic C. Sites with an intermediate MAT and lowest C/N ratio had the largest active pool. Pyrolysis molecular beam mass spectrometry showed declines in carbohydrates with conversion from grassland to wheat cultivation and a greater amount of protected carbohydrates in allophanic soils which may have lead to diff erences found between the total...

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“…However, the here-presented Andosols and Umbrisols have still higher radiocarbon ages. We suppose that this is due to the large amounts of Al humus complexes which formed under strongly acid conditions (Dümig et al, 2008-this volume) because Al humus complexes are known to be particularly resistant to mineralization (Broadbent et al, 1964;Martin et al, 1966;Blaser and Klemmedson, 1987;Boudot et al, 1988;Oades, 1988). As our soils are high in both, organic matter and clay, the strong persistence of old C 4 pools in the Araucaria forest soils may also result from clay organic complexes.…”

Section: Timing Of Vegetation Historymentioning

confidence: 92%

Araucaria forest expansion on grassland in the southern Brazilian highlands as revealed by 14C and δ13C studies

et al. 2008

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Dependence of carbon and nitrogen mineralization rates upon amorphous metallic constituents and allophanes in highland soils

Cited by 36 publications

References 14 publications

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

Clay fractions from a soil chronosequence after glacier retreat reveal the initial evolution of organo–mineral associations

The Role of Soil Characteristics on Temperature Sensitivity of Soil Organic Matter

Araucaria forest expansion on grassland in the southern Brazilian highlands as revealed by 14C and δ13C studies

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