The Impact of Wildfires on Soil CO2 Emission in Middle Taiga Forests in Central Siberia

Makhnykina, Anastasia; Panov, Alexey; Prokushkin, Anatoly

doi:10.3390/land12081544

Cited by 4 publications

(2 citation statements)

References 45 publications

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“…Seasonal soil CO 2 emissions for the studied region varies in a high range, and the mean daily fluxes vary from 0.4 to 10.9 µmol m −2 s −1 [60][61][62]. Even in the wettest seasons, the momentum SR rate does not exceed 16.5 µmol m −2 s −1 [63].…”

Section: Rain-induced Co 2 Pulsesmentioning

confidence: 89%

The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux

Makhnykina,

Vaganov,

Panov

et al. 2024

Forests

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Boreal forests nowadays act as a sink for atmospheric carbon dioxide; however, their sequestration capacity is highly sensitive to weather conditions and, specifically to ongoing climate warming. Extreme weather events such as heavy rainfalls or, conversely, heat waves during the growing season might perturb the ecosystem carbon balance and convert them to an additional CO2 source. Thus, there is an urgent need to revise ecosystem carbon fluxes in vast Siberian taiga ecosystems as influenced by extreme weather events. In this study, we focused on the soil CO2 pulses appearing after the rainfall events and quantification of their input to the seasonal cumulative CO2 efflux in the boreal forests in Central Siberia. Seasonal measurements of soil CO2 fluxes (both soil respiration and net soil exchange) were conducted during three consecutive frost-free seasons using the dynamic chamber method. Seasonal dynamics of net soil exchange fluxes demonstrated positive values, reflecting that soil respiration rates exceeded CO2 uptake in the forest floor vegetation layer. Moreover, the heavy rains caused a rapid pulse of soil emissions and, as a consequence, the release of additional amounts of CO2 from the soil into the atmosphere. A single rain event may cause a 5–11-fold increase of the NSE flux compared to the pre-rainfall values. The input of CO2 pulses to the seasonal cumulative efflux varied from near zero to 39% depending on precipitation patterns of a particular season. These findings emphasize the critical need for more frequent measurements of soil CO2 fluxes throughout the growing season which capture the CO2 pulses induced by rain events. This approach has inevitable importance for the accurate assessment of seasonal CO2 soil emissions and adequate predictions of response of boreal pine forests to climatic changes.

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Section: Rain-induced Co 2 Pulsesmentioning

confidence: 89%

The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux

Makhnykina,

Vaganov,

Panov

et al. 2024

Forests

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“…Wildfires play a significant role in the modern dynamics of taiga ecosystems in the Northern Hemisphere [4,5]. Depending on the fire intensity and type, the forest stand density, productivity and the dominants of the upper and subordinate layers of the vegetation cover change [6].…”

Section: Introductionmentioning

confidence: 99%

Wildfires’ Effect on Soil Properties and Bacterial Biodiversity of Postpyrogenic Histic Podzols (Middle Taiga, Komi Republic)

Chebykina,

Abakumov,

Kimeklis

et al. 2024

Forests

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Data on the main properties of Histic Podzols in the pine forests of semi-hydromorphic landscapes in the middle taiga of the Komi Republic after forest fires are presented. A decrease in topsoil horizon thickness by more than 7.6 times, an increase in litter density by 6 times, and a decrease in litter stock by 4 times were observed in postfire soil. There was an increase in carbon content in the pyrogenic horizon (48%) and in the upper part of the podzolic horizon—from 0.49 at the control plot to 1.16% after the fire. The accumulation of all studied trace metals (Cu—from 2.5 to 6.8 mg × kg−1; Zn—from 35.7 to 127.4 mg × kg−1; Ni—from 2.2 to 8.1 mg × kg−1; Pb—from 1.4 to 28.3 mg × kg−1; Cd—from 0.3 to 1.1 mg × kg−1) in soils after wildfires was recorded. The effect of the fire can be traced to a depth of approximately 20–30 cm. A significant influence of the pyrogenic factor on the alpha and beta bacterial diversity was noted. The bacterial response to a forest fire can be divided into an increased proportion of spore-forming and Gram-negative species with complex metabolism as well.

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Organic matter stability in forest-tundra soils after wildfire

Filimonenko,

Uporova,

Prikhodko

et al. 2024

CATENA

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The Impact of Wildfires on Soil CO2 Emission in Middle Taiga Forests in Central Siberia

Cited by 4 publications

References 45 publications

The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux

The Pulses of Soil CO2 Emission in Response to Rainfall Events in Central Siberia: Revisiting the Overall Frost-Free Season CO2 Flux

Wildfires’ Effect on Soil Properties and Bacterial Biodiversity of Postpyrogenic Histic Podzols (Middle Taiga, Komi Republic)

Organic matter stability in forest-tundra soils after wildfire

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