Responses of two interacting<i>Sphagnum</i>species to water level

Li, Y.; Glime, Janice M.; Liao, Chung-Ping

doi:10.1179/jbr.1992.17.1.59

Cited by 46 publications

(39 citation statements)

References 15 publications

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“…Assuming Sphagnum shoot WC is a function of pressure head, we suggest that pressure head will likely show a species interaction similar to that studied by Silvola and Aaltonen (1984) and Li et al (1992). In order to preserve the geometry of the Sphagnum colony, techniques to measure pressures within intact Sphagnum canopies would be a valuable addition to the study of Sphagnum dynamics.…”

Section: Future Research Directionsmentioning

confidence: 80%

“…A more gradual decline in Sphagnum GEP is observed at a higher WC, where CO 2 diffusion into the chloroplasts is limited because of excess water in the chlorophyllose cells (Proctor, 2000). Relationships between GEP and WC are species and section specific, and are related to the morphology and geometry of the capitula, leaves, and branches (Silvola and Aaltonen, 1984;Li et al, 1992;Rydin, 1993). Additionally, species-interaction effects are observed, where hollow species have a higher WC when surrounded by hummocks species (Rydin, 1985).…”

Section: Sphagnum Water Contentmentioning

confidence: 96%

“…The assumption of a linear decrease in moisture availability has allowed WT to be used as a predictor of Sphagnum production (e.g. Hayward and Clymo, 1983;Rydin, 1985;Li et al, 1992;Silvola et al, 1996;Bubier et al, 2003), where it is assumed to be an indicator of the amount of water available to Sphagnum mosses at the peat-moss interface. However, all too often the relationship between WT depth and water availability for Sphagnum mosses is not explicitly stated or defined, and the limitations of this assumption are rarely explored.…”

Section: Water Table Positionmentioning

confidence: 99%

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Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

Thompson

Waddington

2008

Ecohydrology

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The genus Sphagnum is the key peat-forming bryophyte in boreal ecosystems. Relying entirely on passive capillary action for water transport, soil moisture is often the limiting factor in Sphagnum production, and hence peat accumulation. While several hydrological models of peat physics and peatland water movement exist, these models do not readily interface with observations and models of peatland carbon accumulation. A conflict of approaches exists, where hydrological studies primarily utilize variables such as hydraulic head, while ecological models of Sphagnum growth adopt the coarse hydrological variables of water table (WT), volumetric water content (VWC) or gravimetric water content (WC). This review examines the potential of soil pressure head as a measurement to link the hydrological and ecological functioning of Sphagnum in peatlands. The nonvascular structure of Sphagnum mosses and the reliance on external capillary transport of water in the mosses make them an ideal candidate for this approach. The main advantage of pressure head is the ability to mechanistically link plot-scale hydrology to cellular-scale water requirements and carbon exchange. Measurement of pressure head may improve photosynthetic process representation in the next generation of peatland models.

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Section: Future Research Directionsmentioning

confidence: 80%

Section: Sphagnum Water Contentmentioning

confidence: 96%

Section: Water Table Positionmentioning

confidence: 99%

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Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

Thompson

Waddington

2008

Ecohydrology

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“…This results in increased resistance to CO 2 diffusion from the atmosphere into the mosses (Silvola, 1990;Li et al, 1992;Williams & Flanagan, 1996) and thus to a reduced photosynthetic rate. This process can only be reversed when atmospheric CO 2 levels are greatly increased (Silvola, 1990).…”

Section: Discussionmentioning

confidence: 99%

Substrate‐derived CO₂ is important in the development of Sphagnum spp.

et al. 2001

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Summary• The effects of different CO 2 concentrations in the acrotelm pore water on the development of Sphagnum magellanicum monoliths grown in wet conditions in the laboratory are reported here.• Decomposition processes result in much higher CO 2 concentrations in bog acrotelms than atmospheric concentrations. We therefore hypothesized that this substrate-derived carbon provides an important carbon source for Sphagnum .• S. ma gellanicum hummocks developed only when CO 2 concentrations in the acrotelm water were high. Plants in the low CO 2 treatment appeared to be carbonlimited; they had increased nutrient concentrations and decreased ratios of carbon to other nutrients. Chlorophyll concentrations were much higher in these plants, probably allowing them to harvest more CO 2 , but the allocation of carbon to structural tissues was lower, resulting in weak stems that were unable to remain upright. As a result of carbon-limitation, net biomass and height increases of the monoliths were much lower in the low CO 2 treatment.• Results indicate that, at least in wet conditions, atmospheric CO 2 alone is not sufficient to enable S. magellanicum to develop its normal vertical growth pattern. We conclude that the role of substrate-derived CO 2 as a carbon source for Sphagna is underestimated and requires reconsideration.

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“…However, in situations with lower water availability, the geometry of the Sphagna and of their inter-individual structures plays an important role in water movement (Proctor, 1982 ;Li, Glime & Liao, 1992), which, as well as differing chemical characteristics of Sphagna Luken, 1985) might have a clear effect on nutrient retention.…”

Section: The Methodsmentioning

confidence: 99%

Potential NH₄⁺ and NO₃⁻ uptake in seven Sphagnum species

1998

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The rate of nitrogen uptake by seven Sphagnum species, which from a gradient from hummock to hollow and from ombrotrophic to minerotrophic conditions, was measured as the decrease in the concentrations of NH % + and NO $ − from solutions in which capitula were grown under laboratory conditions.The highest uptake rate was by individuals of each species with large capitula and a high number of ion exchange sites, i.e. lawn species (S. pulchrum, S. fallax, S. papillosum and S. magellanicum). On a dry-mass basis, the most effective species were the hummock species (S. fuscum and S. rubellum), even though these species have a low dry mass. Hummock species, which occur in high densities and have high potential N-uptake rates on a dry-mass basis, were the most effective species in retaining available nitrogen.

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Responses of two interactingSphagnumspecies to water level

Cited by 46 publications

References 15 publications

Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

Substrate‐derived CO₂ is important in the development of Sphagnum spp.

Potential NH₄⁺ and NO₃⁻ uptake in seven Sphagnum species

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Responses of two interactingSphagnumspecies to water level

Cited by 46 publications

References 15 publications

Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

Sphagnum under pressure: towards an ecohydrological approach to examining Sphagnum productivity

Substrate‐derived CO2 is important in the development of Sphagnum spp.

Potential NH4+ and NO3− uptake in seven Sphagnum species

Contact Info

Product

Resources

About

Substrate‐derived CO₂ is important in the development of Sphagnum spp.

Potential NH₄⁺ and NO₃⁻ uptake in seven Sphagnum species