Pyrogenic transformation of organic matter in soils of forest bogs

Ефремова, Т. Т.; Ефремов, С. П.

doi:10.1134/s1064229306120039

Cited by 24 publications

(8 citation statements)

References 3 publications

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“…Low temperature fires often increase carbon content by as much as 3050% before a fire incident (Ponomarienko and Anderson, 2001;Forbes et al, 2006). Such a possibility is described by Efremova and Efremov (2006), who studied fires of large areas of Siberian peats. Peat or moorsh burning also results in a decrease in the volume of decomposition-resistant fibre (B).…”

Section: Resultsmentioning

confidence: 99%

Impact of fire on values of organic material transformation indicators

Bogacz¹,

Łabaz²,

Woźniczka³

2013

Soil Science Annual

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The article discusses organic and organic-mineral soil transformations induced by fire. The research covered 24 soil profiles. It was primarily focused on water properties of post-fire soils, such as the hydrophobic degree, analysed by means of percent alcohol (MED) and WDPT test, and soil water capacity indicator (W 1 ). The above indicators determine the degree of intensification of the moorsh process in post-fire organic soil horizons. Total carbon content was also determined by means of a gas method analyzer by CS MAT 5500, as well as the level of organic material decomposition by means of the half syringe method. The achieved result suggests that the moorsh process and low temperature fires led to an increase in the hydrophobic property of soil organic matter, whereas in high fire temperature, the soil included more ash, and the hydrophilic properties were higher. The significant degree of transformation was also confirmed by the water capacity indicator (W 1 ). It primarily concerned the upper horizons of the investigated soil profiles. The majority of the 76 analysed soil samples showed signs of secondary transformation.

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Section: Resultsmentioning

confidence: 99%

Impact of fire on values of organic material transformation indicators

Bogacz¹,

Łabaz²,

Woźniczka³

2013

Soil Science Annual

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“…This trend has implications for the preservation of stored carbon in peatlands facing increased drought frequency and duration associated with climate change predictions (Karl, Melillo, Peterson, & Hassol, 2009) and the resulting increase in the frequency of fire (Turetsky et al, 2014; Walker et al, 2019). In some ecosystems, low‐severity fire has been shown to create a pool of slower‐cycling carbon (Figure 6; Figure S7) that can mitigate future carbon losses (Cong et al, 2020; Efremova & Efremov, 2006; Leifeld et al, 2012, 2018; Ludwig et al, 2018). Moreover, alteration of microbial communities can reduce heterotrophic respiration, potentially resulting in a negative feedback mechanism to climate change (Holden et al, 2013, 2016).…”

Section: Discussionmentioning

confidence: 99%

Low‐severity fire as a mechanism of organic matter protection in global peatlands: Thermal alteration slows decomposition

Flanagan

Wang

Winton

et al. 2020

Global Change Biology

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Worldwide, regularly recurring wildfires shape many peatland ecosystems to the extent that fire‐adapted species often dominate plant communities, suggesting that wildfire is an integral part of peatland ecology rather than an anomaly. The most destructive blazes are smoldering fires that are usually initiated in periods of drought and can combust entire peatland carbon stores. However, peatland wildfires more typically occur as low‐severity surface burns that arise in the dormant season when vegetation is desiccated, and soil moisture is high. In such low‐severity fires, surface layers experience flash heating, but there is little loss of underlying peat to combustion. This study examines the potential importance of such processes in several peatlands that span a gradient from hemiboreal to tropical ecozones and experience a wide range of fire return intervals. We show that low‐severity fires can increase the pool of stable soil carbon by thermally altering the chemistry of soil organic matter (SOM), thereby reducing rates of microbial respiration. Using X‐ray photoelectron spectroscopy and Fourier transform infrared, we demonstrate that low‐severity fires significantly increase the degree of carbon condensation and aromatization of SOM functional groups, particularly on the surface of peat aggregates. Laboratory incubations show lower CO2 emissions from peat subjected to low‐severity fire and predict lower cumulative CO2 emissions from burned peat after 1–3 years. Also, low‐severity fires reduce the temperature sensitivity (Q10) of peat, indicating that these fires can inhibit microbial access to SOM. The increased stability of thermally altered SOM may allow a greater proportion of organic matter to survive vertical migration into saturated and anaerobic zones of peatlands where environmental conditions physiochemically protect carbon stores from decomposition for thousands of years. Thus, across latitudes, low‐severity fire is an overlooked factor influencing carbon cycling in peatlands, which is relevant to global carbon budgets as climate change alters fire regimes worldwide.

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“…Some authors have noted an increase in humic acid content and a decrease in the carbon-to-nitrogen ratio (Abakumov and Frouz, 2009;Efremova and Efremov, 2006). By contrast, the appearance of the most aggressive fractions presented by fulvic acids was recorded in other studies (Dobrovol'skij, 2002).…”

Section: Soil Profile Analysis and Physico-chemical Propertiesmentioning

confidence: 92%

Micromorphological characteristics of sandy forest soils recently impacted by wildfires in Russia

Maksimova

Abakumov

2017

Solid Earth

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Abstract. Two fire-affected soils were studied using micromorphological methods. The objective of the paper is to assess and compare fire effects on the micropedological organisation of soils in a forest-steppe zone of central Russia (Volga Basin, Togliatti city). Samples were collected in the green zone of Togliatti city. The results showed that both soils were rich in quartz and feldspar. Mica was highly present in soils affected by surface fires, while calcium carbonates were identified in the soils affected by crown fires. The type of plasma is humus-clay, but the soil assemblage is plasmasilt with a prevalence of silt. Angular and subangular grains are the most dominant soil particulates. No evidence of intensive weathering was detected. There was a decrease in the porosity of soils affected by fires as a consequence of soil pores filled with ash and charcoal.

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Pyrogenic transformation of organic matter in soils of forest bogs

Cited by 24 publications

References 3 publications

Impact of fire on values of organic material transformation indicators

Impact of fire on values of organic material transformation indicators

Low‐severity fire as a mechanism of organic matter protection in global peatlands: Thermal alteration slows decomposition

Micromorphological characteristics of sandy forest soils recently impacted by wildfires in Russia

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