Solar radiation drives methane emissions from the shoots of Scots pine

Tenhovirta, Salla; Kohl, Leonie; Koskinen, Markku; Patama, Marjo; Lintunen, Anna; Zanetti, Alessandro; Lilja, Rauna; Pihlatie, Mari

doi:10.1111/nph.18120

Cited by 14 publications

(16 citation statements)

References 58 publications

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“…Trees have been shown to transport and emit soil‐derived CH 4 (Barba, Poyatos, et al, 2019; Covey & Megonigal, 2019; Pitz & Megonigal, 2017; Plain & Epron, 2021) while tree stems may inhabit microbes that produce and consume CH 4 (Jeffrey, Maher, Tait, & Johnston, 2020; Li et al, 2020; Warner et al, 2017; Yip et al, 2019). Consequently, abiotic conditions and biotic processes within tree stems and canopies can contribute to the net CH 4 exchange of forests (Machacova et al, 2016; Putkinen et al, 2021; Sundqvist et al, 2012; Tenhovirta et al, 2022). Tree CH 4 stem fluxes show high variability among different tree species and growing conditions resulting from a combination of production and consumption dynamics and transport processes contributing to net CH 4 fluxes (Barba, Bradford, et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

“…Consequently, abiotic conditions and biotic processes within tree stems and canopies can contribute to the net CH 4 exchange of forests (Machacova et al, 2016;Putkinen et al, 2021;Sundqvist et al, 2012;Tenhovirta et al, 2022). Tree CH 4 stem fluxes show high variability among different tree species and growing conditions resulting from a combination of production and consumption dynamics and transport processes contributing to net CH 4 fluxes (Barba, Bradford, et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…Carbon sequestration of the atmospheric CO 2 into tree biomass and forest soil is among the most important terrestrial carbon sinks, while upland forest soil is also an important sink for atmospheric CH 4 due to microbial CH 4 consumption in the soil (Kirschke et al, 2013; Saunois et al, 2016). Recently observed CH 4 emissions from both tree stems and canopies may offset part of the forest soil CH 4 sink and thus significantly contribute to the CH 4 budget of upland forests (Barba, Poyatos, et al, 2019; Carmichael et al, 2014; Covey & Megonigal, 2019; Machacova et al, 2016; Pangala et al, 2017; Saunois et al, 2016; Tenhovirta et al, 2022). Trees have been shown to transport and emit soil‐derived CH 4 (Barba, Poyatos, et al, 2019; Covey & Megonigal, 2019; Pitz & Megonigal, 2017; Plain & Epron, 2021) while tree stems may inhabit microbes that produce and consume CH 4 (Jeffrey, Maher, Tait, & Johnston, 2020; Li et al, 2020; Warner et al, 2017; Yip et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

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Model of methane transport in tree stems: Case study of sap flow and radial diffusion

Anttila,

Tikkasalo,

Hölttä

et al. 2023

Plant Cell & Environment

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The transport processes of methane (CH4) in tree stems remain largely unknown, although they are critical in assessing the whole‐forest CH4 dynamics. We used a physically based dynamic model to study the spatial and diurnal dynamics of stem CH4 transport and fluxes. We parameterised the model using data from laboratory experiments with Pinus sylvestris and Betula pendula and compared the model to experimental data from a field study. Stem CH4 flux in laboratory and field conditions were explained by the axial advective CH4 transport from soil with xylem sap flow and the radial CH4 diffusion through the stem conditions. Diffusion resistance caused by the bark permeability did not significantly affect gas transport or stem CH4 flux in the laboratory experiments. The role of axial diffusion of CH4 in trees was unresolved and requires further studies. Due to the transit time of CH4 in the stem, the diurnal dynamics of stem CH4 fluxes can deviate markedly from the diurnal dynamics of sap flow.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Model of methane transport in tree stems: Case study of sap flow and radial diffusion

Anttila,

Tikkasalo,

Hölttä

et al. 2023

Plant Cell & Environment

Self Cite

View full text Add to dashboard Cite

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“…Methane emission from plants is accelerated by interaction with other stressors such as herbivore damage and high temperatures [ 427 ]. Controlled experiments with Scots pine and Norway spruce under ambient conditions in Finland found a positive relationship between methane emissions and solar radiation, which was steeper at warmer temperatures [ 428 ]. Even then, in most habitats, direct emission from plants through photodegradation of pectin [ 429 ] is considered only a minor contributor to global terrestrial methane emissions [ 421 , 428 ].…”

Section: Effects On Biogeochemical Cycles and Climate Feedbacksmentioning

confidence: 99%

Interactive effects of changes in UV radiation and climate on terrestrial ecosystems, biogeochemical cycles, and feedbacks to the climate system

Barnes

Robson

Zepp

et al. 2023

Photochem Photobiol Sci

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Terrestrial organisms and ecosystems are being exposed to new and rapidly changing combinations of solar UV radiation and other environmental factors because of ongoing changes in stratospheric ozone and climate. In this Quadrennial Assessment, we examine the interactive effects of changes in stratospheric ozone, UV radiation and climate on terrestrial ecosystems and biogeochemical cycles in the context of the Montreal Protocol. We specifically assess effects on terrestrial organisms, agriculture and food supply, biodiversity, ecosystem services and feedbacks to the climate system. Emphasis is placed on the role of extreme climate events in altering the exposure to UV radiation of organisms and ecosystems and the potential effects on biodiversity. We also address the responses of plants to increased temporal variability in solar UV radiation, the interactive effects of UV radiation and other climate change factors (e.g. drought, temperature) on crops, and the role of UV radiation in driving the breakdown of organic matter from dead plant material (i.e. litter) and biocides (pesticides and herbicides). Our assessment indicates that UV radiation and climate interact in various ways to affect the structure and function of terrestrial ecosystems, and that by protecting the ozone layer, the Montreal Protocol continues to play a vital role in maintaining healthy, diverse ecosystems on land that sustain life on Earth. Furthermore, the Montreal Protocol and its Kigali Amendment are mitigating some of the negative environmental consequences of climate change by limiting the emissions of greenhouse gases and protecting the carbon sequestration potential of vegetation and the terrestrial carbon pool. Graphical abstract

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Soil-tree-atmosphere CH4 flux dynamics of boreal birch and spruce trees during spring leaf-out

et al. 2022

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Aims Studies on tree CH4 exchange in boreal forests regarding seasonality and role of tree canopies are rare. We aimed to quantify the contribution of boreal trees to the forest CH4 budget during spring leaf-out and to reveal the role of microbes in the CH4 exchange. Methods Methane fluxes of downy birch and Norway spruce (Betula pubescens and Picea abies) growing on fen and upland sites were measured together with soil CH4 flux, environmental variables and microbial abundances involved in the CH4 cycle. Tree CH4 fluxes were studied from three stem heights and from shoots. Results The trees emitted CH4 with higher stem emissions detected from birch and higher shoot emissions from spruce. The stem CH4 emissions from birches at the fen were high (mean 45 µg m−2 h−1), decreasing with stem height. Their dynamics followed soil temperature, suggesting the emitted CH4 originated from methanogenic activity, manifested in high mcrA gene copy numbers, in the peat soil. Methanogens were below the quantification limit in the tree tissues. Upscaled tree CH4 emissions accounted for 22% of the total CH4 emissions at the fen. Conclusions The variation in stem CH4 flux between the trees and habitats is high, and the emissions from high-emitting birches increase as the spring proceeds. The lack of detection of methanogens or methanotrophs in the aboveground plant tissues suggests that these microbes did not have a significant role in the observed tree-derived fluxes. The stem-emitted CH4 from birches at the fen is presumably produced microbially in the soil.

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Solar radiation drives methane emissions from the shoots of Scots pine

Cited by 14 publications

References 58 publications

Model of methane transport in tree stems: Case study of sap flow and radial diffusion

Model of methane transport in tree stems: Case study of sap flow and radial diffusion

Interactive effects of changes in UV radiation and climate on terrestrial ecosystems, biogeochemical cycles, and feedbacks to the climate system

Soil-tree-atmosphere CH4 flux dynamics of boreal birch and spruce trees during spring leaf-out

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