Above- and belowground fluxes of methane from boreal dwarf shrubs and Pinus sylvestris seedlings

Halmeenmäki, Elisa; Heinonsalo, Jussi; Putkinen, Anuliina; Santalahti, Minna; Fritze, Hannu; Pihlatie, Mari

doi:10.1007/s11104-017-3406-7

Cited by 16 publications

(9 citation statements)

References 71 publications

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“…The presence of plants may also promote growth of methanotrophic populations (Halmeenmäki et al ., ; Subke et al ., ) by supplying the methanotrophs with organic compounds during periods of CH 4 scarcity and by facilitating their access to P and N (Bodelier & Laanbroek, ; Veraart et al ., ). Enhancing methanotrophic populations in the rhizosphere may increase CH 4 consumption in the soil near plants.…”

Section: Discussionmentioning

confidence: 99%

“…In upland forests, where CH 4 absorption prevails, trees and dwarf shrubs such as Vaccinium myrtillus, Vaccinium vitis‐idaea and Calluna vulgaris may instead enhance soil CH 4 uptake by facilitating the transport of atmospheric CH 4 to methanotrophic bacteria and/or by favouring the growth of methanotrophic populations (Sundqvist et al ., ; Halmeenmäki et al ., ; Subke et al ., ).…”

Section: Introductionmentioning

confidence: 99%

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Impact of vegetation on the methane budget of a temperate forest

Plain

Ndiaye

Bonnaud³

et al. 2018

New Phytologist

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Upland forest soils are known to be the main biological sink for methane, but studies have shown that net methane uptake of a forest ecosystem can be reduced when methane emissions by vegetation are considered. We estimated the methane budget of a young oak plantation by considering tree stems but also the understorey vegetation.Automated chambers connected to a laser-based gas analyser, on tree stems, bare soil and soil covered with understorey vegetation, recorded CH 4 fluxes for 7 months at 3 h intervals.Tree stem emissions were low and equated to only 0.1% of the soil sink. Conversely, the presence of understorey vegetation increased soil methane uptake. This plant-driven enhancement of CH 4 uptake occurred when the soil was consuming methane. At the stand level, the methane budget shifted from À1.4 AE 0.4 kg C ha À1 when we upscaled data obtained only on bare soil, to À2.9 AE 0.6 kg C ha À1 when we considered soil area that was covered with understorey vegetation.These results indicate that aerenchymatous plant species, which are known to reduce the methane sink in wetlands, actually increase soil methane uptake two-fold in an upland forest by enhancing methane and oxygen transport and/or by promoting growth of methanotrophic populations.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of vegetation on the methane budget of a temperate forest

Plain

Ndiaye

Bonnaud³

et al. 2018

New Phytologist

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“…Potential methanotrophic species (OTUs) were rare in the heartwood and sapwood of Populus deltoides (Yip et al ., ), and CH 4 oxidation was not detected in incubations of wood from two other temperate forest tree species (Wang et al ., ). No clear evidence of the pmoA gene of methanotrophic bacteria was found in the roots and shoots of boreal forest shrubs (Halmeenmäki et al ., ). However, the pmoA gene is abundant in dead wood where methanotrophs appear to contribute to N 2 fixation (Mäkipääa et al ., ).…”

Section: Tree‐produced Ch4mentioning

confidence: 97%

Methane production and emissions in trees and forests

2019

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Forest ecosystem methane (CH 4 ) research has focused on soils, but trees are also important sources and sinks in forest CH 4 budgets. Living and dead trees transport and emit CH 4 produced in soils; living trees and dead wood emit CH 4 produced inside trees by microorganisms; and trees produce CH 4 through an abiotic photochemical process. Here, we review the state of the science on the production, consumption, transport, and emission of CH 4 by living and dead trees, and the spatial and temporal dynamics of these processes across hydrologic gradients inclusive of wetland and upland ecosystems. Emerging research demonstrates that tree CH 4 emissions can significantly increase the source strength of wetland forests, and modestly decrease the sink strength of upland forests. Scaling from stem or leaf measurements to trees or forests is limited by knowledge of the mechanisms by which trees transport soil-produced CH 4 , microbial processes produce and oxidize CH 4 inside trees, a lack of mechanistic models, the diffuse nature of forest CH 4 fluxes, complex overlap between sources and sinks, and extreme variation across individuals. Understanding the complex processes that regulate CH 4 source-sink dynamics in trees and forests requires cross-disciplinary research and new conceptual models that transcend the traditional binary classification of wetland vs upland forest.

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“…Atmospheric hydroxyl (OH) radicals are recognized as the main sink for atmospheric CH 4 , whereas the largest biological sink is microbiological CH 4 oxidation that occurs mostly in soils (Kirschke et al ., 2013). CH 4 consumption in plants has been observed both in the field and in laboratory studies (Kirschbaum & Walcroft, 2008; Sundqvist et al ., 2012; Zhang et al ., 2014; Halmeenmäki et al ., 2017; Stępniewska et al ., 2018). Research has mainly concentrated on CH 4 ‐rich environments, such as peatlands, where the importance of Sphagnum moss‐associated methanotrophic bacteria is well recognized (e.g.…”

Section: Introductionmentioning

confidence: 99%

New insight to the role of microbes in the methane exchange in trees: evidence from metagenomic sequencing

Putkinen

Siljanen

Laihonen³

et al. 2021

New Phytologist

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Methane (CH 4 ) exchange in tree stems and canopies and the processes involved are among the least understood components of the global CH 4 cycle. Recent studies have focused on quantifying tree stems as sources of CH 4 and understanding abiotic CH 4 emissions in plant canopies, with the role of microbial in situ CH 4 formation receiving less attention. Moreover, despite initial reports revealing CH 4 consumption, studies have not adequately evaluated the potential of microbial CH 4 oxidation within trees. In this paper, we discuss the current level of understanding on these processes. Further, we demonstrate the potential of novel metagenomic tools in revealing the involvement of microbes in the CH 4 exchange of plants, and particularly in boreal trees. We detected CH 4 -producing methanogens and novel monooxygenases, potentially involved in CH 4 consumption, in coniferous plants. In addition, our field flux measurements from Norway spruce (Picea abies) canopies demonstrate both net CH 4 emissions and uptake, giving further evidence that both production and consumption are relevant to the net CH 4 exchange. Our findings, together with the emerging diversity of novel CH 4 -producing microbial groups, strongly suggest microbial analyses should be integrated in the studies aiming to reveal the processes and drivers behind plant CH 4 exchange.

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Above- and belowground fluxes of methane from boreal dwarf shrubs and Pinus sylvestris seedlings

Cited by 16 publications

References 71 publications

Impact of vegetation on the methane budget of a temperate forest

Impact of vegetation on the methane budget of a temperate forest

Methane production and emissions in trees and forests

New insight to the role of microbes in the methane exchange in trees: evidence from metagenomic sequencing

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