Methane emissions from stems of Fraxinus mandshurica var. japonica trees in a floodplain forest

Terazawa, Kazuhiko; Ishizuka, Shigehiro; Sakata, Tadashi; Yamada, Kenji; Takahashi, Masamichi

doi:10.1016/j.soilbio.2007.05.013

Cited by 103 publications

(94 citation statements)

References 29 publications

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“…However, microbial production of CH 4 in the wet heartwood of trees has been known for at least 40 yr (Zeikus and Ward, 1974). Furthermore, trees can transport and release CH 4 from soil water (Gauci et al, 2010;Terazawa et al, 2007). Laboratory studies have shown that aerobic CH 4 emissions from vegetation could be triggered by UV radiation and heating (Vigano et al, 2008), but emissions in the absence of UV have also been measured, although at much lower rates (Bruhn et al, 2009).…”

Section: Impact Of Vegetationmentioning

confidence: 99%

“…Even if CH 4 emissions are sporadic and limited to restricted areas, their occurrence frequency and source strength might turn a forest from a net sink to a net source of CH 4 (Fiedler et al, 2005;Sakabe et al, 2012). The capacity of plants with roots in CH 4 -rich water-saturated soils, even woody plants, to transport and release CH 4 (Terazawa et al, 2007;Gauci et al, 2010) adds another level of the complexity to the analyses.…”

Section: Introductionmentioning

confidence: 99%

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Methane exchange in a boreal forest estimated by gradient method

Sundqvist

Mölder

Crill

et al. 2015

Tellus B: Chemical and Physical Meteorology

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A B S T R A C T Forests are generally considered to be net sinks of atmospheric methane (CH 4 ) because of oxidation by methanotrophic bacteria in well-aerated forests soils. However, emissions from wet forest soils, and sometimes canopy fluxes, are often neglected when quantifying the CH 4 budget of a forest. We used a modified Bowen ratio method and combined eddy covariance and gradient methods to estimate net CH 4 exchange at a boreal forest site in central Sweden. Results indicate that the site is a net source of CH 4 . This is in contrast to soil, branch and leaf chamber measurements of uptake of CH 4 . Wetter soils within the footprint of the canopy are thought to be responsible for the discrepancy. We found no evidence for canopy emissions per se. However, the diel pattern of the CH 4 exchange with minimum emissions at daytime correlated well with gross primary production, which supports an uptake in the canopy. More distant source areas could also contribute to the diel pattern; their contribution might be greater at night during stable boundary layer conditions.

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Section: Impact Of Vegetationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Methane exchange in a boreal forest estimated by gradient method

Sundqvist

Mölder

Crill

et al. 2015

Tellus B: Chemical and Physical Meteorology

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“…In a very wet forest with thick moss mats, epiphytes, and termites in the canopy, anaerobic microbial emission is possible (do Carmo et al, 2006), but our forest has a dry canopy except immediately after rain events, and no similar organic microbial habitat within the canopy or termites. The possibility exists for deep soil anaerobic microbial CH 4 production, followed by transport through the stem and out through the stomata, but this mechanism is highly speculative at present except for flood-adapted species that possess aerenchyma (Rusch and Rennenberg, 1998;Terazawa et al, 2007;Megonigal and Guenther, 2008). The evening wind direction reversal from somewhat-polluted to relatively-cleaner flow at Niwot Ridge (Fig.…”

Section: Within-canopy Gradients Daytime Excess and Canopy Fluxesmentioning

confidence: 99%

“…Until recently, the role of living plants in the methane cycle was thought to be limited to transport of microbiallyproduced CH 4 through aerenchyma in herbaceous wetland plants and some woody plants (Schimel, 1995;Rusch and D. R. Bowling et al: Soil, plant, and transport influences on methane Rennenberg, 1998;Terazawa et al, 2007). A recent paper by Keppler et al (2006) suggested the intriguing possibility that vascular plants emit CH 4 directly, under aerobic conditions, and without the involvement of microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Soil, plant, and transport influences on methane in a subalpine forest under high ultraviolet irradiance

et al. 2009

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Abstract. Recent studies have demonstrated direct methane emission from plant foliage under aerobic conditions, particularly under high ultraviolet (UV) irradiance. We examined the potential importance of this phenomenon in a high-elevation conifer forest using micrometeorological techniques. Vertical profiles of methane and carbon dioxide in forest air were monitored every 2 h for 6 weeks in summer 2007. Day to day variability in above-canopy CH 4 was high, with observed values in the range 1790 to 1910 nmol mol −1 . High CH 4 was correlated with high carbon monoxide and related to wind direction, consistent with pollutant transport from an urban area by a well-studied mountain-plain wind system. Soils were moderately dry during the study. Vertical gradients of CH 4 were small but detectable day and night, both near the ground and within the vegetation canopy. Gradients near the ground were consistent with the forest soil being a net CH 4 sink. Using scalar similarity with CO 2 , the magnitude of the summer soil CH 4 sink was estimated at ∼1.7 mg CH 4 m −2 h −1 , which is similar to other temperate forest upland soils. The high-elevation forest was naturally exposed to high UV irradiance under clear sky conditions, with observed peak UVB irradiance >2 W m −2 . Gradients and means of CO 2 within the canopy under daytime conditions showed net uptake of CO 2 due to photosynthetic drawdown as expected. No evidence was found for a significant foliar CH 4 source in the vegetation canopy, even under high UV conditions. While the possibility of a weak foliar source Correspondence to: D. R. Bowling (bowling@biology.utah.edu) cannot be excluded given the observed soil sink, overall this subalpine forest was a net sink for atmospheric methane during the growing season.

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“…Although a large amount of CH 4 has been shown to come through emergent wetland plants (Shannon et al, 1996), physiological correlations for tree emission of CH 4 have been studied very little and the role that woody vegetation has in wetland emission of CH 4 is still poorly understood (Vann 25 and Megonigal, 2003;Terazawa et al, 2007). It should be mentioned that more recently, Pangala et al (2014) did find a strong correlation between lenticel density and CH 4 flux from stems in the tree species Alnus glutinosa.…”

mentioning

confidence: 99%

Mechanisms of methane transport through <i>Populus trichocarpa</i>

Kutschera

Khalil

Rice

et al. 2016

Preprint

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Abstract. Although the dynamics of methane (CH 4 ) emission from croplands and wetlands have been fairly well investigated, the contribution of trees to global CH 4 emission and the mechanisms of tree transport are relatively unknown. CH 4 emissions from the common wetland tree species Populus trichocarpa (black cottonwood) native to the Pacific Northwest were measured under hydroponic conditions in order to separate plant transport mechanisms from the influence of soil processes. Roots were exposed to CH 4 enriched water and canopy emissions of CH 4 were measured. The average flux for 34 trials (at temper-

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Methane emissions from stems of Fraxinus mandshurica var. japonica trees in a floodplain forest

Cited by 103 publications

References 29 publications

Methane exchange in a boreal forest estimated by gradient method

Methane exchange in a boreal forest estimated by gradient method

Soil, plant, and transport influences on methane in a subalpine forest under high ultraviolet irradiance

Mechanisms of methane transport through <i>Populus trichocarpa</i>

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Methane emissions from stems of Fraxinus mandshurica var. japonica trees in a floodplain forest

Cited by 103 publications

References 29 publications

Methane exchange in a boreal forest estimated by gradient method

Methane exchange in a boreal forest estimated by gradient method

Soil, plant, and transport influences on methane in a subalpine forest under high ultraviolet irradiance

Mechanisms of methane transport through &lt;i&gt;Populus trichocarpa&lt;/i&gt;

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Mechanisms of methane transport through <i>Populus trichocarpa</i>