Behind the stability of boreal bog carbon sink: Compositional and functional variation of vegetation across  temporal and spatial scales

Korrensalo, Aino

doi:10.14214/df.240

Cited by 3 publications

(5 citation statements)

References 66 publications

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“…This observation holds for each of the three growing seasons studied, which indicates that the spatial homogeneity of methane fluxes is not an artifact but a characteristic property of the studied bog. The same site has been previously shown to also have spatially homogeneous biomass production and net ecosystem exchange rates, except on bare peat surfaces with little vegetation (Karofeld, 2004;Korrensalo, 2017). We found only small spatial variation, as hummocks and high lawns had a higher methane flux than high hummocks and bare peat surfaces in 2013, and bare peat surfaces had a higher methane flux than high hummocks in 2014.…”

Section: Discussionsupporting

confidence: 50%

Small spatial variability in methane emission measured from a wet patterned boreal bog

et al. 2018

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Abstract. We measured methane fluxes of a patterned bog situated in Siikaneva in southern Finland from six different plant community types in three growing seasons (2012)(2013)(2014) using the static chamber method with chamber exposure of 35 min. A mixed-effects model was applied to quantify the effect of the controlling factors on the methane flux.The plant community types differed from each other in their water level, species composition, total leaf area (LAI TOT ) and leaf area of aerenchymatous plant species (LAI AER ). Methane emissions ranged from −309 to 1254 mg m −2 d −1 . Although methane fluxes increased with increasing peat temperature, LAI TOT and LAI AER , they had no correlation with water table or with plant community type. The only exception was higher fluxes from hummocks and high lawns than from high hummocks and bare peat surfaces in 2013 and from bare peat surfaces than from high hummocks in 2014. Chamber fluxes upscaled to ecosystem level for the peak season were of the same magnitude as the fluxes measured with the eddy covariance (EC) technique. In 2012 and in August 2014 there was a good agreement between the two methods; in 2013 and in July 2014, the chamber fluxes were higher than the EC fluxes.Net fluxes to soil, indicating higher methane oxidation than production, were detected every year and in all community types. Our results underline the importance of both LAI AER and LAI TOT in controlling methane fluxes and indicate the need for automatized chambers to reliably capture localized events to support the more robust EC method.

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Section: Discussionsupporting

confidence: 50%

Small spatial variability in methane emission measured from a wet patterned boreal bog

et al. 2018

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“…This contradicts the hypothesis that methane emissions would be higher from wet plant community types that have thin aerobic peat layer for methane consumption and more aerenchymatous vegetation to transport methane from peat straight to the atmosphere, as found earlier in different peatland ecosystems (Bubier et al, 1993;Saarnio et al, 1997;MacDonald et al, 1998;Frenzel and Karofeld, 2000;Laine et al, 2007). However, the result of this study (I) is in line with the previous study that found the biomass production and net ecosystem exchange rates in the same bog site to also be similar between the plant community types, except for the bare peat surfaces that were small carbon sources (Korrensalo, 2017). Therefore, the evenness of carbon dynamics between different plant community types seems to be characteristic to the site.…”

Section: Methane Fluxes and Their Controlssupporting

confidence: 92%

“…The upscaled flux was further weighted by the aerial cover of the six community types of the study area (88.4 %) (Fig. 2), which was based on vegetation inventories conducted over the 30 m radius study area in July 2012 and 2013 (Korrensalo, 2017). For upscaling the ebullition fluxes, total average ebullition flux was first calculated as a sum of average ebullition fluxes from open water pools and bare peat surfaces that were weighted with their relative surface area (11.6 % and 15.3 %) (Fig.…”

Section: Upscaling the Chamber And Ebullition Measurements To The Eco...mentioning

confidence: 99%

Emissions of methane and other biogenic volatile organic compounds from boreal peatlands

Männistö¹

2022

Diss. For.

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This study aims to 1) quantify the spatial and temporal variation in diffusive and ebullitive methane fluxes, and to 2) assess the quantity and quality of BVOC emissions and how they are controlled by vegetation composition and environmental factors in boreal peatlands. Methane fluxes were measured with static chambers and bubble traps from a boreal ombrotrophic bog and compared to eddy covariance measurements on the ecosystem level. BVOC emissions were measured with dynamic chambers from the same boreal bog and a nearby boreal fen. Vegetation removal treatments were applied to differentiate BVOC emissions from intact vegetation, mosses, and peat. Both methane and BVOC emissions showed strong seasonality linked to temperature and vegetation phenology. While diffusive methane fluxes did not differ between three years or different plant community types, methane ebullition was highest during the wettest of the three years studied and varied spatially being greater from open water pools than from wet bare peat surfaces. Decrease in water table led to higher ebullition, but so did also increase in air pressure. In total, ebullition contributed only 2 % – 8 % to the methane emission on the ecosystem level, which supports the general paradigm that diffusion through peat and aerenchymatous plants are the main pathways for methane from peat to the atmosphere. Isoprene was the most emitted BVOC from both peatlands. Isoprene emission was strongly linked to sedges, and thus isoprene and total BVOC emission rates were higher in the sedge-dominated fen than the shrub-dominated bog. Moreover, total BVOC and isoprene emissions were highest from intact vegetation. However, organic halide emissions had stronger link with water level as they were absent during exceptional drought in the summer 2018. Therefore, warming climate and associated drougths and shrubification are likely to alter the quality and quantity of BVOCs emitted from boreal peatlands.

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“…We expected to find higher methane fluxes from wetter plant community is not an artifact but a characteristic property of the studied bog. The same site has been previously shown to have also spatially homogeneous biomass production and net ecosystem exchange rates, except on bare peat surfaces with little vegetation (Korrensalo, 2017). We found only small spatial variation, as hummocks had higher methane flux in 2013 than the other plant community types.…”

supporting

confidence: 54%

“…This can partly 370 explain our result that methane fluxes from drier plant community types were similar to the fluxes measured from wetter plant community type. Moreover, Korrensalo (2017) showed that biomass production rates on the same bog site are similar among the plant community types, except on bare peat surfaces that produce very little biomass. This can also partly explain our result, as methane emission has a positive correlation with primary production (Whiting and Chanton, 1993;Rinne et al, 2017).…”

mentioning

confidence: 94%

Small spatial but large sporadic variability in methane emission measured from a patterned boreal bog

Korrensalo¹,

Männistö²,

Alekseychik³

et al. 2017

Preprint

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We measured methane fluxes of a patterned bog from six different plant community types in three growing seasons 2012-2014 using the static chamber method. A mixed effects model was applied for 15 quantifying the effect of the controlling factors on the methane flux.The plant community types differed from each other in their water level, total leaf area (LAITOT) and leaf area of aerenchymatous plant species (LAIAER). Excluding the highest 2.5 % of all fluxes, methane emissions ranged from -309 to 556 mg m -2 d -1 . Although methane fluxes increased with increasing peat temperature, LAITOT and LAIAER, they had no correlation with water table or with plant community type. 20The only exception were higher fluxes from hummocks than from other plant community types in 2013.

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Behind the stability of boreal bog carbon sink: Compositional and functional variation of vegetation across temporal and spatial scales

Cited by 3 publications

References 66 publications

Small spatial variability in methane emission measured from a wet patterned boreal bog

Small spatial variability in methane emission measured from a wet patterned boreal bog

Emissions of methane and other biogenic volatile organic compounds from boreal peatlands

Small spatial but large sporadic variability in methane emission measured from a patterned boreal bog

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