The interactive effects of elevated carbon dioxide and water table draw-down on carbon cycling in a Welsh ombrotrophic bog

Ellis, Timothy G.; Hill, Paul W.; Fenner, Nathalie; Williams, G. G.; Godbold, Douglas L.; Freeman, Chris

doi:10.1016/j.ecoleng.2008.10.011

Cited by 49 publications

(37 citation statements)

References 88 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…When the water table was below surface, R e increased to near 1 µmol m −2 s −1 and became stable no matter how low the water table position was. This relationship was also found in many other peatlands (Bridgham et al, 2006;Ellis et al, 2009;Strack et al, 2006). There was no obvious relationship between θ w (integrated from 0 to 30 cm depth) and R e .…”

Section: Ecosystem Respirationmentioning

confidence: 66%

Annual greenhouse gas budget for a bog ecosystem undergoing restoration by rewetting

et al. 2017

View full text Add to dashboard Cite

Abstract. Many peatlands have been drained and harvested for peat mining, agriculture, and other purposes, which has turned them from carbon (C) sinks into C emitters. Rewetting of disturbed peatlands facilitates their ecological recovery and may help them revert to carbon dioxide (CO 2 ) sinks. However, rewetting may also cause substantial emissions of the more potent greenhouse gas (GHG) methane (CH 4 ). Our knowledge of the exchange of CO 2 and CH 4 following rewetting during restoration of disturbed peatlands is currently limited. This study quantifies annual fluxes of CO 2 and CH 4 in a disturbed and rewetted area located in the Burns Bog Ecological Conservancy Area in Delta, BC, Canada. Burns Bog is recognized as the largest raised bog ecosystem on North America's west coast. Burns Bog was substantially reduced in size and degraded by peat mining and agriculture. Since 2005, the bog has been declared a conservancy area, with restoration efforts focusing on rewetting disturbed ecosystems to recover Sphagnum and suppress fires. Using the eddy covariance (EC) technique, we measured year-round (16 June 2015 to 15 June 2016) turbulent fluxes of CO 2 and CH 4 from a tower platform in an area rewetted for the last 8 years. The study area, dominated by sedges and Sphagnum, experienced a varying water table position that ranged between 7.7 (inundation) and −26.5 cm from the surface during the study year. The annual CO 2 budget of the rewetted area was −179 ± 26.2 g CO 2 -C m −2 yr −1 (CO 2 sink) and the annual CH 4 budget was 17 ± 1.0 g CH 4 -C m −2 yr −1 (CH 4 source). Gross ecosystem productivity (GEP) exceeded ecosystem respiration (R e ) during summer months (June-August), causing a net CO 2 uptake. In summer, high CH 4 emissions (121 mg CH 4 -C m −2 day −1 ) were measured. In winter (December-February), while roughly equal magnitudes of GEP and R e made the study area CO 2 neutral, very low CH 4 emissions (9 mg CH 4 -C m −2 day −1 ) were observed. The key environmental factors controlling the seasonality of these exchanges were downwelling photosynthetically active radiation and 5 cm soil temperature. It appears that the high water table caused by ditch blocking suppressed R e . With low temperatures in winter, CH 4 emissions were more suppressed than R e . Annual net GHG flux from CO 2 and CH 4 expressed in terms of CO 2 equivalents (CO 2 eq.) during the study period totalled −22 ± 103.1 g CO 2 eq. m −2 yr −1 (net CO 2 eq. sink) and 1248 ± 147.6 g CO 2 eq. m −2 yr −1 (net CO 2 eq. source) by using 100-and 20-year global warming potential values, respectively. Consequently, the ecosystem was almost CO 2 eq. neutral during the study period expressed on a 100-year time horizon but was a significant CO 2 eq. source on a 20-year time horizon.

show abstract

Section: Ecosystem Respirationmentioning

confidence: 66%

Annual greenhouse gas budget for a bog ecosystem undergoing restoration by rewetting

et al. 2017

View full text Add to dashboard Cite

show abstract

“…The different sensitivity to soil moisture could be caused by the different substrate availability between communities, as the decrease in substrate availability has been shown to reduce the temperature sensitivity of CH 4 emission (Boardman et al, 2013). But as we have shown earlier, the CH 4 fluxes in these sites were mainly controlled by soil moisture, which have regulated the substrate, the origin of CH 4 production (Bergman et al, 1998;Ellis et al, 2009;Ström et al, 2012), and hence the supply rates to methanogens. The higher soil BD at forb sites might be another explanation (Table 1), which led to less oxygen diffusion and consequently slower oxidation of CH 4 (Konda et al, 2010) as the SWC increased.…”

Section: Controls On Ch 4 Fluxesmentioning

confidence: 96%

Soil moisture, species composition interact to regulate CO2 and CH4 fluxes in dry meadows on the Tibetan Plateau

Luan

Song

Xiang

et al. 2016

Ecological Engineering

View full text Add to dashboard Cite

“…Finalmente la disminución en la recarga del acuífero permitirá la entrada de oxígeno a suelos previamente anegados, favoreciendo la descomposición aeróbica de la materia orgánica acumulada en ellos, aumentando la emisión de gases de efecto invernadero, como el CH 4 , el N 2 O y CO 2 e incidiendo en un desbalance de carbono de los ecosistemas (e.g. Wolf et al 2007, Ellis et al 2009, van Groenigen et al 2011. En consecuencia, la función que cumplen hoy los humedales como sumideros de carbono es muy probable que cambie como consecuencia del cambio climático (Wrona et al 2006).…”

Section: Potenciales Efectos Del Cambio Climático Sobre Humedalesunclassified

Observatorio Ecosocial Para El Seguimiento Del Cambio Climático en Ecosistemas De Altura en La Región De Tarapacá: Propuestas, Avances Y Proyecciones

Uribe-Rivera¹,

Burgos²,

Paicho³

et al. 2017

Diálogo Andino

View full text Add to dashboard Cite

The interactive effects of elevated carbon dioxide and water table draw-down on carbon cycling in a Welsh ombrotrophic bog

Cited by 49 publications

References 88 publications

Annual greenhouse gas budget for a bog ecosystem undergoing restoration by rewetting

Annual greenhouse gas budget for a bog ecosystem undergoing restoration by rewetting

Soil moisture, species composition interact to regulate CO2 and CH4 fluxes in dry meadows on the Tibetan Plateau

Observatorio Ecosocial Para El Seguimiento Del Cambio Climático en Ecosistemas De Altura en La Región De Tarapacá: Propuestas, Avances Y Proyecciones

Contact Info

Product

Resources

About