Potential Feedbacks of Northern Wetlands on Climate Change

Bridgham, Scott D.; Johnston, Carol A.; Pastor, John; Updegraff, Karen

doi:10.2307/1312419

Cited by 146 publications

(105 citation statements)

References 67 publications

Supporting

Mentioning

102

Contrasting

Order By: Relevance

“…Anaerobic decomposition of organic matter in wetland ecosystems generates CO 2 and CH 4 [30], which are important greenhouse gases [5]. Once inorganic terminal electron acceptors (TEAs, e.g., NO 3 − , Fe(III), Mn(III, IV), and SO 4 2− ) have been consumed, methanogenesis occurs and results in equal molar amounts of CO 2 production and CH 4 production [11].…”

Section: Introductionmentioning

confidence: 99%

Extracellular Quinones Affecting Methane Production and Methanogenic Community in Paddy Soil

Yang

et al. 2013

Microb Ecol

View full text Add to dashboard Cite

This study investigated the change of CH 4 production and methanogenic community in response to the presence of humic substances (humics) analogue, anthraquinone-2,6-disulfonate (AQDS). Anaerobic experiments used a Chinese paddy soil, and three concentration levels of 0.5, 5, and 20 mM AQDS were conducted. Results suggested that the effect of AQDS on methanogenesis was time-dependent and concentration-dependent. Twenty millimolars of AQDS was toxic for methanogenic activity almost for the entire experimental period. Slight inhibition of methanogenesis by AQDS respiration in the 0.5-and 5-mM AQDS-supplemented treatments occurred within the early period, while CH 4 accumulated throughout the later period was approximately five and ten times greater than that of the controls without AQDS, respectively. AQDS reduction coupling to acetate oxidization enriched Geobacter species, and the mcrA-targeted T-RFLP profiles revealed significant increase of Methanosarcina at the expense of Methanobacterium in the 0.5-and 5-mM AQDS treatments. The enriched syntrophic association between Geobacter and Methanosarcina was deduced to be an effective methanogenic pathway for converting acetate to CH 4 via direct interspecies electron transfer. This study implied the ecological importance of syntrophic interaction between methanogens and microorganisms enriched by anaerobic respiration of non-methanogenic terminal electron acceptors in paddy soils.

show abstract

Section: Introductionmentioning

confidence: 99%

Extracellular Quinones Affecting Methane Production and Methanogenic Community in Paddy Soil

Yang

et al. 2013

Microb Ecol

View full text Add to dashboard Cite

show abstract

“…Further, wetlands are currently responsible for between 15% and 40% of the global CH 4 flux (Denman et al, 2007). Wetlands could release additional CO 2 or CH 4 if carbon mineralization in wetland soils is stimulated by ongoing climate change, augmenting anthropogenic emissions of these important greenhouse gases (Gorham, 1995;Bridgham et al, 1995). Thus, understanding the factors that control anaerobic carbon decomposition in wetland soils has important implications for understanding the global carbon cycle.…”

Section: Introductionmentioning

confidence: 99%

Humic acids as electron acceptors in wetland decomposition

Keller

Weisenhorn

Megonigal

2009

Soil Biology and Biochemistry

153

View full text Add to dashboard Cite

“…Global change is expected to affect structure and functioning of several types of ecosystems, including bogs (Gorham 1991;Bridgham et al 1995). Bog ecosystems function as long-term terrestrial carbon sinks and contain a large fraction of the global soil carbon pool (Gorham 1991;Wieder and Vitt 2006).…”

Section: Introductionmentioning

confidence: 99%

“…Bog ecosystems function as long-term terrestrial carbon sinks and contain a large fraction of the global soil carbon pool (Gorham 1991;Wieder and Vitt 2006). In these ecosystems, potential effects of global change might be of enormous importance, as the carbon sink capacity may be reduced or even changed into a carbon source (Bridgham et al 1995).…”

Section: Introductionmentioning

confidence: 99%

Dwarf shrubs are stronger competitors than graminoid species at high nutrient supply in peat bogs

Kool

Heijmans

2009

Plant Ecol

View full text Add to dashboard Cite

Climate warming is likely to increase nutrient mineralization rates in bog ecosystems which may change the plant species composition. We examined the competitive relationships between two graminoid species, Eriophorum vaginatum and Rhynchospora alba, and two ericoid species, Calluna vulgaris and Vaccinium oxycoccus, at different nutrient supply rates. In a greenhouse, the plants were grown in monocultures and mixtures at four nutrient treatments: control, high N, high P, and high N ? P. The results show that the ericoids responded more strongly to the nutrient treatments than the graminoids. The dwarf shrubs showed higher growth rates and reduced root:shoot ratio at high N ? P supply. When grown in mixture the ericoids increased their growth, while graminoids decreased in biomass or showed signs of nutrient limitation compared to their monoculture plants. This suggests that under increased nutrient availability, bogs are more likely to turn into dwarf shrub dominated ecosystems and not grassland.

show abstract

Potential Feedbacks of Northern Wetlands on Climate Change

Cited by 146 publications

References 67 publications

Extracellular Quinones Affecting Methane Production and Methanogenic Community in Paddy Soil

Extracellular Quinones Affecting Methane Production and Methanogenic Community in Paddy Soil

Humic acids as electron acceptors in wetland decomposition

Dwarf shrubs are stronger competitors than graminoid species at high nutrient supply in peat bogs

Contact Info

Product

Resources

About