Effects of vegetation on the emission of methane from submerged paddy soil

Holzapfel-Pschorn, A.; Conrad, Ralf; Seiler, W.

doi:10.1007/bf02372636

Cited by 367 publications

(188 citation statements)

References 29 publications

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“…In addition, the cessation of rhizosphere CH 4 oxidation, as observed ex situ (Fig. 1b), would further enhance CH 4 emissions (Gerard and Chanton 1993;Holzapfel-Pschorn et al 1986). Indeed, the decline in CH 4 emissions at the later stages of rice growth (Fig.…”

Section: Discussionmentioning

confidence: 87%

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Root oxygen loss from Raphia taedigera palms mediates greenhouse gas emissions in lowland neotropical peatlands

et al. 2016

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Aims Little is known about the influence of vegetation on the timing and quantities of greenhouse gas fluxes from lowland Neotropical peatlands to the atmosphere. To address this knowledge gap, we investigated if palm forests moderate greenhouse gas fluxes from tropical peatlands due to radial oxygen loss from roots into the peat matrix. Methods We compared the diurnal pattern of greenhouse gas fluxes from peat monoliths with and without seedlings of Raphia taedigera palm, and monitored the effect of land use change on greenhouse gas fluxes from R. taedigera palm swamps in Bocas del Toro, Panama. Results CH 4 fluxes from peat monoliths with R. taedigera seedlings varied diurnally, with the greatest emissions during daytime. Radial oxygen loss from the roots of R. taedigera seedlings partially supressed CH 4 emissions at midday; this suppression increased as seedlings grew. On a larger scale, removal of R. taedigera palms for agriculture increased CH 4 and N 2 O fluxes, but decreased CO 2 fluxes when compared to nearby intact palm forest. The net impact of forest clearance was a doubling of the radiative forcing. Conclusions R. taedigera palm forest influences the emission of greenhouse gases from lowland tropical peatlands through radial oxygen loss into the rhizosphere.

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Section: Discussionmentioning

confidence: 87%

“…2). This suggests that oxygen input by R. taedigera into the peat enhanced CH 4 oxidation (De Bont et al 1978;Calhoun and King 1997;Gerard and Chanton 1993;King 1996), and/or partially inhibited methanogenesis (Grosse et al 1996;Holzapfel-Pschorn et al 1986), reducing CH 4 fluxes by ca. 40 % compared to controls.…”

Section: Discussionmentioning

confidence: 99%

Root oxygen loss from Raphia taedigera palms mediates greenhouse gas emissions in lowland neotropical peatlands

et al. 2016

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“…Soil from rice fields at the Italian Rice Research Institute in Vercelli, Italy, was a sandy loam (Holzapfel-Pschorn et al, 1986). The soil and the experimental procedures were the same as that used by Liu and Conrad (2010).…”

Section: Soil Incubationmentioning

confidence: 99%

Chemolithotrophic acetogenic H2/CO2 utilization in Italian rice field soil

Liu

Conrad

2011

The ISME Journal

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Acetate oxidation in Italian rice field at 50 1C is achieved by uncultured syntrophic acetate oxidizers. As these bacteria are closely related to acetogens, they may potentially also be able to synthesize acetate chemolithoautotrophically. Labeling studies using exogenous H 2 (80%) and 13 CO 2 (20%), indeed demonstrated production of acetate as almost exclusive primary product not only at 50 1C but also at 15 1C. Small amounts of formate, propionate and butyrate were also produced from 13 CO 2 . At 50 1C, acetate was first produced but later on consumed with formation of CH 4 . Acetate was also produced in the absence of exogenous H 2 albeit to lower concentrations. The acetogenic bacteria and methanogenic archaea were targeted by stable isotope probing of ribosomal RNA (rRNA). Using quantitative PCR, 13 C-labeled bacterial rRNA was detected after 20 days of incubation with 13 CO 2 . In the heavy fractions at 15 1C, terminal restriction fragment length polymorphism, cloning and sequencing of 16S rRNA showed that Clostridium cluster I and uncultured Peptococcaceae assimilated 13 CO 2 in the presence and absence of exogenous H 2 , respectively. A similar experiment showed that Thermoanaerobacteriaceae and Acidobacteriaceae were dominant in the 13 C treatment at 50 1C. Assimilation of 13 CO 2 into archaeal rRNA was detected at 15 1C and 50 1C, mostly into Methanocellales, Methanobacteriales and rice cluster III. Acetoclastic methanogenic archaea were not detected. The above results showed the potential for acetogenesis in the presence and absence of exogenous H 2 at both 15 1C and 50 1C. However, syntrophic acetate oxidizers seemed to be only active at 50 1C, while other bacterial groups were active at 15 1C.

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“…Enhancement occurs through production and release of organic matter (Holzapfel-Pschorn et al, 1986;Schütz et al, 1991), and by transportation of CH 4 via molecular diffusion or convective flow through the internal gas spaces of the plants, thus bypassing oxidation in the anoxic/oxic interface (Shannon and White, 1994;Sorrell and Boon, 1994;Shannon et al, 1996). Many species of emergent macrophytes possess a convective flow mechanism which is many times more efficient in transporting gases than diffusion alone (Brix et al, 1992), and hence these species may accelerate the emission of CH 4 from wetlands (Brix et al, 1996).…”

Section: Introductionmentioning

confidence: 99%