Role of cation exchange in preventing the decay of anoxic deep bog peat

Thomas, Paul A.; Pearce, D. M. E.

doi:10.1016/j.soilbio.2003.07.003

Cited by 23 publications

(26 citation statements)

References 31 publications

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“…There are few studies in the literature on the availability of cations in peat (Williams and Crawford, 1984;Thomas and Pearce, 2004) and none on the effect of Pb or Al. We demonstrate that patterns of soluble and total cations are not equivalent.…”

Section: Discussionmentioning

confidence: 99%

“…Previous studies have shown that applied soluble cations can stimulate methanogenic activity in peat (Basiliko and Yavitt, 2001; Thomas and Pearce, 2004;Gogo and Pearce, 2009), and that microorganisms (in planktonic and aggregated states) use nutrients in solution (Teitzel and Parsek, 2003;Hall-Stoodley et al, 2004). The mechanisms of cation stimulation may be via direct nutrient stimulation, and be indirect, via release of limiting cations from exchange site reactions.…”

Section: Introductionmentioning

confidence: 99%

“…The control of microbial activity is only partly understood, but involves cations (Williams and Crawford, 1984;Gonzalez-Gil et al, 1999;Basiliko and Yavitt, 2001; Thomas and Pearce, 2004), anions (Dise and Verry, 2001;Basiliko and Yavitt, 2001), a carbon source (Martin and Holding, 1978;Thomas and Pearce, 2004), and cation exchange capacity (Thomas and Pearce, 2004) at least. Comparisons between studies, and conclusions about the relative roles of different rate-limiting factors are difficult to draw because different indicators of decay rates, combined with different controlling factors have been investigated.…”

Section: Introductionmentioning

confidence: 99%

“…Experimental approaches have used anion and cation amendments to peat and measured microbial activities (e.g. Williams and Crawford, 1984;Basiliko and Yavitt, 2001; Thomas and Pearce, 2004). Other cation treatments have also included carbon sources (Martin and Holding 1978) and mineral nutrients such as N and P (Williams and Crawford, 1984).…”

Section: Introductionmentioning

confidence: 99%

“…Cations have also been added with different anions (e.g. Williams and Crawford, 1984;Basiliko and Yavitt, 2001; Thomas and Pearce, 2004), without necessarily factoring out the effects of the anions.…”

Section: Introductionmentioning

confidence: 99%

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Geochemistry of three contrasting British peatlands: Complex patterns of cation availability and implications for microbial metabolism

2010

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of three contrasting British peatlands: Complex patterns of cation availability and implications for microbial metabolism. Geoderma, Elsevier, 2010, 158 (3-4) 2 Abstract Cation availability in peat may limit CH 4 production and microbial activity and thereby impact rates of organic matter accumulation and the chemical character of the peat. We quantify total, soluble, and exchangeable cation concentrations, Exchange Site Saturation Levels (ESSL) and organic fractions in bog-peat profiles and compare these with fen-peat.Total and soluble cation concentrations are not correlated and these and exchangeable cation concentrations are lower in bog than fen peat. In all sites these vary with depth and the distribution patterns of individual cations are unique. This is explained by variation in ESSL, which is negatively correlated with Cation Exchange Capacity (CEC). Total cation concentrations in bog-peat are higher in the top and bottom fractions than in the middle.Soluble concentrations in surface bog-peat are low, because cations are trapped due to low ESSL. This does not occur in fen-peat, with lower CEC and higher ESSL. CEC is related to total organic matter content, not just to Sphagnum, which has been invoked as the explanatory variable of high CEC in peat bogs. There is a complexity in the mechanisms controlling cation availability in peat and we suggest that total, soluble and exchangeable cation fractions need to be taken into account in studies of cation limitation of microbial activity in organic soils.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Geochemistry of three contrasting British peatlands: Complex patterns of cation availability and implications for microbial metabolism

2010

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Climatic drivers for multidecadal shifts in solute transport and methane production zones within a large peat basin

Glaser

Siegel

Chanton

et al. 2016

Global Biogeochemical Cycles

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Northern peatlands are an important source for greenhouse gases, but their capacity to produce methane remains uncertain under changing climatic conditions. We therefore analyzed a 43 year time series of the pore‐water chemistry to determine if long‐term shifts in precipitation altered the vertical transport of solutes within a large peat basin in northern Minnesota. These data suggest that rates of methane production can be finely tuned to multidecadal shifts in precipitation that drive the vertical penetration of labile carbon substrates within the Glacial Lake Agassiz Peatlands. Tritium and cation profiles demonstrate that only the upper meter of these peat deposits was flushed by downwardly moving recharge from 1965 to 1983 during a Transitional Dry‐to‐Moist Period. However, a shift to a moister climate after 1984 drove surface waters much deeper, largely flushing the pore waters of all bogs and fens to depths of 2 m. Labile carbon compounds were transported downward from the rhizosphere to the basal peat at this time producing a substantial enrichment of methane in Δ14C with respect to the solid‐phase peat from 1991 to 2008. These data indicate that labile carbon substrates can fuel deep production zones of methanogenesis that more than doubled in thickness across this large peat basin after 1984. Moreover, the entire peat profile apparently has the capacity to produce methane from labile carbon substrates depending on climate‐driven modes of solute transport. Future changes in precipitation may therefore play a central role in determining the source strength of peatlands in the global methane cycle.

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Carbon in Boreal Peatlands

Vasander

Kettunen

Ecological Studies

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Role of cation exchange in preventing the decay of anoxic deep bog peat

Cited by 23 publications

References 31 publications

Geochemistry of three contrasting British peatlands: Complex patterns of cation availability and implications for microbial metabolism

Geochemistry of three contrasting British peatlands: Complex patterns of cation availability and implications for microbial metabolism

Climatic drivers for multidecadal shifts in solute transport and methane production zones within a large peat basin

Carbon in Boreal Peatlands

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