Decomposition Rate of Peat-Forming Plants in Oligotrophic Bogs of the Southern Taiga Subzone of Western Siberia: Assessment of the Effect of Water Table Level and Peat Deposit Temperature

Nikonova, L. G.; Golovatskaya, E. A.; Kurina, Irina V.; Kurganova, I. N.

doi:10.1134/s1064229319090060

Cited by 8 publications

(7 citation statements)

References 29 publications

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“…The obtained differences in the rate of mass loss of Sph. fuscum and E. vaginatum are significant and are consistent with previously obtained data [12,19]. Sphagnum mosses contain the least amount of bitumen and many easily hydrolyzable and water-soluble compounds of the carbohydrate complex; therefore, sphagnum mosses should be the least resistant to decomposition.…”

Section: Discussionsupporting

confidence: 91%

“…Therefore, the decrease in the water table level is less critical for the dynamics of the δ 13 C value in comparison with the change in temperature. At the same time, a decrease in the water table level leads to an increase in the rate of transformation of plant residues under drier conditions, decomposition proceeds more intensively, which is consistent with other studies [10,18,19,53] The change in δ 13 C value was different for the two species, the δ 13 C value of Sph. fuscum litter was enriched, while the δ 13 C value of E. vaginatum litter decreased.…”

Section: Discussionsupporting

confidence: 91%

“…There are relatively few works devoted to the study of the dynamics of decomposition of peatforming plants in bog ecosystems [6][7][8][9][10][11][12][13][14][15][16]. The rate of decomposition of plant residues depends on the chemical composition of plants and the hydrothermal conditions under which these processes occur [6,[17][18][19]. While humidity and temperature play a leading role in the transformation of plant residues [6,7,17,20], changing weather conditions cause an irregular, intermittent peat-forming process, which is typical for raised bogs that receive their main water supply from precipitation.…”

Section: Introductionmentioning

confidence: 99%

“…Very rarely have the plants themselves or the early stages of transformation of plant remains been studied [52][53][54][55][56][57]. On the territory of the southern taiga subzone of Western Siberia, the issue of changes in the isotope composition during the transformation of plant remains has practically not been studied at all [58], especially in bog ecosystems subject to anthropogenic or pyrogenic influence.…”

Section: Introductionmentioning

confidence: 99%

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Variability of the Carbon Isotope Composition of Peat-Forming Plants during the Biochemical Transformation

Golovatskaya

Nikonova

Simonova

et al. 2022

Water

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In this study, we describe the variation in δ13C value in the litter of two species of peat-forming plants: Sphagnum fuscum and Eriophorum vaginatum, during 3 years of field decomposition in oligotrophic bog ecosystems drained for the purpose of forest melioration and fire affected and at the stage of post-pyrogenic restoration. Litterbags were periodically retrieved in the autumn and the δ13C value in the residual litter was related to mass loss, litter chemistry, and hydrothermal conditions. Sph. fuscum decomposes much more slowly than E. vaginatum. Low rate of transformation for Sph. fuscum is observed in drained and post-pyrogenic sites, while for E. vaginatum minimal rate of transformation is observed in the native site. During the decomposition of Sphagnum residues, 13C enrichment occurs, and during the decomposition of E. vaginatum, we observed 12C enrichment. The changes in the isotope composition of carbon for investigation sites are insignificant for Sphagnum fuscum, but it was observed for E. vaginatum, the largest of 13C depletion is observed in the drained site (−28.3‰) and minimal in the postpyrogenic site (−27.4‰).

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Section: Discussionsupporting

confidence: 91%

Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Variability of the Carbon Isotope Composition of Peat-Forming Plants during the Biochemical Transformation

Golovatskaya

Nikonova

Simonova

et al. 2022

Water

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“…Decay rates of S. angustifolium/fallax from this study were included with literature data on S. angustifolium , and decay rates of S. divinum from this study were included with S. magellanicum . Decay rate data were extracted or were calculated from mass loss assuming an exponential decay from: Bartsch and Moore (1985), Lieffers (1988), Rochefort et al (1990), Johnson and Damman (1991), Szumigalski and Bayley (1996), Limpens and Berendse (2003), Waddington et al (2003), Thormann et al (2004), Moore et al (2007), Turetsky et al (2008), Graf and Rochefort (2009), Hájek (2009), Bragazza et al (2012), Tarvainen et al (2013), Jiroušek et al (2015), Bengtsson et al (2016), Berube and Rochefort (2018), Mäkilä et al (2018) and Nikonova et al (2019).…”

Section: Discussionmentioning

confidence: 99%

Deciphering the shifting role of intrinsic and extrinsic drivers on moss decomposition in peatlands over a 5‐year period

Shelley

Brice

Iversen

et al. 2021

Oikos

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Bryophytes are largely responsible for globally significant carbon accumulation in peatland ecosystems. This accumulation is primarily caused by the slow decomposition of these mosses, which can be attributed to a combination of intrinsic (chemical) characteristics of decaying mosses and extrinsic (environmental) influences. Here we investigated the importance of intrinsic and extrinsic drivers of moss decomposition in peatlands and hypothesized that the early stages of decay will be driven primarily by intrinsic characteristics, while extrinsic drivers will become more important in the later phases of decomposition. We tested this hypothesis by placing litterbags of three moss types (Sphagnum divinum, Sphagnum angustifolium/fallax and Polytrichum sp.) into hummock and hollow microtopographies in a bog and a lawn microtopography in a nearby poor fen in northern Minnesota, USA. Decomposition was measured over a 5-year period and confirmed our hypothesis; while intrinsic and extrinsic variables were both important in driving decay rates over time, decay in the first year was primarily predicted by litter type, while extrinsic influences (e.g. peat temperature, moisture, nutrient limitation) that varied at peatland and microtopographic scales became more important by year 5. Though the nutrient (i.e. nitrogen [N] and phosphorus [P]) content of decaying mosses did not explain the variation in decay rates among litter types, analysis of N:P in moss litter suggested that litter-decaying microorganisms became increasingly P-limited over time. The majority of litter decomposition studies in peatlands are generally of short duration (< 3 years). Our study suggests that longerterm studies are needed to reveal the roles of multiple drivers of moss decay. Improving the mechanistic understanding of decomposition processes in peatlands will be critical to developing more robust representations of peatlands and their ecosystem processes in carbon and climate models.

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Organic matter decomposition in mountain peatlands: effects of substrate quality and peatland degradation

Jayasekara,

Leigh,

Shimeta

et al. 2024

Plant Soil

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Background and Aims Peatlands occupy only 3% of Earth’s terrestrial lands but store about one-third of global soil carbon. However, these large carbon stocks are currently under threat due to peatland degradation, where altered hydrological balance could enhance peat oxidation; thus releasing large amounts of CO2 into the atmosphere. We investigated the interactive effects of substrate quality, peat depth and peatland degradation on the decomposition rate of organic matter in peatlands by way of a field incubation experiment. Methods We incubated high-quality fresh peat and a lower-quality degraded peat substrate at three different depths (5, 15, and 30 cm) in two (intact and degraded) mountain peatlands for 18 months. Our results indicated that there is a significant interactive effect of substrate quality, peat depth, and peatland type on the peat decomposition rate. Results The fresh peat showed significantly higher decomposition rates than the degraded peat substrate, likely due to the high percentage of bioavailable carbon in the fresh moss substrate. In the degraded peatland, fresh peat at 30 cm showed no mass loss during the incubation period, likely due to the high-water table creating anaerobic conditions. The fresh peat incubated in the intact peatland showed a higher decomposition rate than the same substrate incubated in the degraded peatland due to the comparatively lower water table in the intact peatland. Conclusions Our findings indicate that the quality of the substrate being decomposed and the depth of the water table act as the main factors affecting the decomposition rate in mountain peatlands.

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Decomposition Rate of Peat-Forming Plants in Oligotrophic Bogs of the Southern Taiga Subzone of Western Siberia: Assessment of the Effect of Water Table Level and Peat Deposit Temperature

Cited by 8 publications

References 29 publications

Variability of the Carbon Isotope Composition of Peat-Forming Plants during the Biochemical Transformation

Variability of the Carbon Isotope Composition of Peat-Forming Plants during the Biochemical Transformation

Deciphering the shifting role of intrinsic and extrinsic drivers on moss decomposition in peatlands over a 5‐year period

Organic matter decomposition in mountain peatlands: effects of substrate quality and peatland degradation

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