PHOTOSYNTHESIS IN DESICCATED SHOOTS OF <i>POLYTRICHUM</i>

Penny, M. G.; Bayfield, N.

doi:10.1111/j.1469-8137.1982.tb03343.x

Cited by 16 publications

(5 citation statements)

References 16 publications

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“…90% of Σ P V for a deciduous shrub with peak season L > 2 m 2 m −2 . High rates of productivity per unit ground area for P. piliferum are consistent with previous studies on excised shoots (Oechel & Collins 1976; Penny & Bayfield 1982). While S. fuscum had lower rates of photosynthesis than P. piliferum , Σ P B was still c .…”

Section: Discussionsupporting

confidence: 91%

Seasonal bryophyte productivity in the sub‐Arctic: a comparison with vascular plants

et al. 2012

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Summary1. Arctic ecosystems are experiencing rapid climate change, which could result in positive feedbacks on climate warming if ecosystem carbon (C) loss exceeds C uptake through plant growth. Bryophytes (mosses, liverworts and hornworts) are important components of Arctic vegetation, but are currently not well represented in terrestrial C models; in particular, seasonal patterns in bryophyte C metabolism compared to vascular plant vegetation are poorly understood. 2. Our objective was to quantify land-surface CO 2 fluxes for common sub-Arctic bryophyte patches (dominated by Polytrichum piliferum and Sphagnum fuscum) in spring (March-May) and during the summer growing season (June-August) and to develop a simple model of bryophyte gross primary productivity fluxes (P B ). We use the model to explore the key environmental controls over P B for P. piliferum and S. fuscum and compare seasonal patterns of productivity with those of typical vascular plant communities at the same site. 3. The modelled total gross primary productivity (RP B ) over 1 year (March -November) for P. piliferum was c. 360 g C m )2 ground and for S. fuscum c. 112 g C m )2 ground, c. 90% and 30% of total gross primary productivity for typical vascular plant communities (RP V ) over the same year. In spring (March-May), when vascular plant leaves are not fully developed, RP B for P. piliferum was 3 · RP V . 4. Model sensitivity analysis indicated that bryophyte turf water content does not significantly affect (March-November) RP B for P. piliferum and S. fuscum, at least for periods without sustained lack of precipitation. However, we find that seasonal changes in bryophyte photosynthetic capacity are important in determining RP B for both bryophyte species. 5. Our study implies that models of C dynamics in the Arctic must include a bryophyte component if they are intended to predict the effects of changes in the timing of the growing season, or of changes in vegetation composition, on Arctic C balance.

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Section: Discussionsupporting

confidence: 91%

Seasonal bryophyte productivity in the sub‐Arctic: a comparison with vascular plants

et al. 2012

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“…During summer then, Polytrichum may have suffered from drier soil, especially in June, which had the lowest soil moisture values of the studied period. It is also possible that warmer and drier conditions may have desiccated its leaves, reducing the plant photosynthetic rate (Penny & Bayfield, 1982). A similar pattern is reported for ridges, which showed a peak in CO 2 uptake in autumn, whereas in summer NEE values were very close to zero.…”

Section: Effect Of Microtopography and Vegetation On Net Ecosystem Exchangesupporting

confidence: 61%

Seasonal patterns of greenhouse gas emissions from a forest‐to‐bog restored site in northern Scotland: Influence of microtopography and vegetation on carbon dioxide and methane dynamics

Mazzola

Perks

Smith

et al. 2020

European J Soil Science

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Northern peatlands play an important role in the regulation of the atmospheric greenhouse gas (GHG) balance, functioning as a net carbon sink with low rates of organic decomposition. However, perturbations such as drainage increase peat oxidation, which may lead to enhanced gaseous release of carbon. For this reason, the number of restoration projects that aim to rewet blanket bogs has increased in the last few years, but there is still a lack of understanding of the impact of restoration on emissions of greenhouse gases, such as methane, particularly in sites restored from forestry. In this paper, we investigate the seasonal greenhouse gas dynamics in a forest‐to‐bog restoration site in Scotland. We analyse the effects of restoration on both carbon dioxide and methane fluxes, and investigate which site factors (microtopography, vegetation type, soil moisture and temperature) drive the processes of gaseous exchange between the bog surface and the atmosphere. Our results show that the original surface is near greenhouse gase equilibrium at −0.28 gCO2eq m2·day−1 and that microtopographic features act as a net greenhouse gas sink (ridges = −0.94 gCO2eq m2·day−1 and furrows = −0.86 gCO2eq m2·day−1), whereas the bog pool is a net source of greenhouse gases (0.98 gCO2eq m2·day−1). We found different vegetation species play a key role in greenhouse gas flux dynamics, especially in forestry‐derived microtopographical features, and their presence and influence on greenhouse gas dynamics should be accounted for to provide a more comprehensive understanding of emissions associated with restoration management practices.Highlights GHG (CO2 and CH4) dynamics in a boreal peatland restored from forestry are mainly affected by microtopography and vegetation. Forestry‐derived microforms (ridges and furrows) are better GHG sinks than pools (GHG emitters) and original surfaces (near GHG equilibrium). The presence of Trichophorum cespitosum leads to higher CH4 emissions. Restoration practices like terraforming may create a short‐term pulse net GHG emission due to an increase of both CH4 and CO2 fluxes.

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“…Using fern gametophytes it was found that rate of drying was more closely related to recovery than final water content (Watkins et al, 2007). Only a single study has assessed rates of desiccation (as hours at a single RH) under a common RH for bryophytes (Penny and Bayfield, 1982), and although only 3 rates (durations) were employed (6.0, 1.5, and 0.6 h @55% RH), significant recovery differences were found. Our purpose here is to assess DT over a range of rates of desiccation under a given RH considered to represent the presence of DT (50% RH; Koster et al, 2010), potentially allowing the resolution of the fine‐scale effects of rate of desiccation on recovery in an IDT species.…”

Section: Ecological Elements Of Dt In Bryophytesmentioning

confidence: 99%

The desert moss Pterygoneurum lamellatum (Pottiaceae) exhibits an inducible ecological strategy of desiccation tolerance: Effects of rate of drying on shoot damage and regeneration

Stark

Greenwood

Brinda

et al. 2013

American J of Botany

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For the first time, a desert moss is shown to exhibit an ecological strategy of desiccation tolerance that is inducible, challenging the assumption that arid-land bryophytes rely exclusively on constitutive protection. Results indicate that previous considerations defining a slow-dry event in bryophytes need reevaluation, and that the ecological strategy of inducible desiccation tolerance is probably more common than currently understood among terrestrial bryophytes.

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PHOTOSYNTHESIS IN DESICCATED SHOOTS OF POLYTRICHUM

Cited by 16 publications

References 16 publications

Seasonal bryophyte productivity in the sub‐Arctic: a comparison with vascular plants

Seasonal bryophyte productivity in the sub‐Arctic: a comparison with vascular plants

Seasonal patterns of greenhouse gas emissions from a forest‐to‐bog restored site in northern Scotland: Influence of microtopography and vegetation on carbon dioxide and methane dynamics

The desert moss Pterygoneurum lamellatum (Pottiaceae) exhibits an inducible ecological strategy of desiccation tolerance: Effects of rate of drying on shoot damage and regeneration

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