Notes on water relations of<i>Polytrichum commune</i>Hedw.

Bayfield, N.

doi:10.1179/jbr.1973.7.4.607

Cited by 59 publications

(47 citation statements)

References 6 publications

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“…AD 1572e1777.5 (zone M2a). According to testate amoebae, the mire became gradually wetter, while Polytrichum strictum suggested dry conditions at the sampling site (Bayfield, 1973). A temporary admixture with Sphagnum magellanicum (macrofossils) indicates more acidic conditions.…”

Section: Ad 1454e1572 (Zone M1f) the Indicators Both For Grazing Andmentioning

confidence: 97%

A multi-proxy, high-resolution record of peatland development and its drivers during the last millennium from the subalpine Swiss Alps

Knaap

Lamentowicz

Leeuwen

et al. 2011

Quaternary Science Reviews

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a b s t r a c tWe present a record of peatland development during the last 1000 years from Mauntschas mire in the eastern Swiss Alps (Upper Engadine valley; 1818 m a.s.l.) inferred from testate amoebae (pH and depth to the water table (DWT) reconstructions), stable oxygen isotopes in Sphagnum (d C correlates with DWT only during AD 1000e1570. Part of this apparent instability among the four time series might be attributed to shifts in the local mire conditions which potentially formed very different (non-analogue) habitats. Lack of analogues, caused, for example, by pre-industrial human impact, might have introduced artefacts in the reconstructions, since those habitats are not well represented in some proxy transfer functions. Human impact was probably the main factor for peatland development, distorting most of the climate signals.

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Section: Ad 1454e1572 (Zone M1f) the Indicators Both For Grazing Andmentioning

confidence: 97%

A multi-proxy, high-resolution record of peatland development and its drivers during the last millennium from the subalpine Swiss Alps

Knaap

Lamentowicz

Leeuwen

et al. 2011

Quaternary Science Reviews

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“…In the genus Polytrichum there is a more or less welldeveloped water-conducting tissue (Hebant, 1973). The leaves are comparatively elaborate, and control water loss to a limited extent by leaf folding (or 'closure') as shoot water potential decreases (Bayfield, 1973). The effectiveness of this control varies between species, and desiccation responses may vary to a similar extent.…”

Section: Introductionmentioning

confidence: 99%

PHOTOSYNTHESIS IN DESICCATED SHOOTS OF POLYTRICHUM

Penny¹,

Bayfield²

1982

New Phytologist

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SUMMARYThe desiccation responses of four species of Polytrichum were examined. The relationship between COj assimilation and shoot water content was similar in Polytrichum commune and Polytrichum piliferum, the species most dissimilar in ecological requirements. There were, however, considerable differences between species in recovery following various desiccation treatments.Continuous desiccation was found to be more damaging than the same total period of desiccation interrupted by periods of wetting. Polytrichum piliferum was least affected by any of the desiccation treatments. Desiccation to 76 °o rh. was found to suppress the photosynthetic rate of both Polytrichum commune and Polytrichum piliferum after rewetting more than treatment at 55% or 90% r.h. Subsequent recovery was generally better following the 90"0 r.h. treatment.Slow desiccation of Polytrichum commune was substantially less damaging than rapid drying.

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“…Since gametophytes of these plants lack stomata, they depend largely on their morphological features for the control of evaporative water loss. It has been shown that the rate of water loss in bryophytes is affected by various morphological features, such as leaf arrangement (Bayfield 1973), hair point (Proctor 1981) and growth form (Tagawa 1961;Gimingham & Smith 1971). Among these, the growth form seems to be especially important since each species shows one or a few growth forms and some correlation between growth form and habitat conditions has been reported (Gimingham & Birse 1957;Longton 1988).…”

Section: Introductionmentioning

confidence: 99%

The effect of growth form on the evaporation in some subalpine mosse

Nakatsubo

1994

Ecological Research

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In order to evaluate the importance of growth form of mosses in controlling evaporative water loss, the evaporation rates of some subalpine moss species of various growth forms were compared with each other. The growth forms of the xerophytic species examined were large cushion and compact mat, while those of the mesophytic species in the coniferous forest floor were smooth mat, weft and tall turf. The evaporation rate per moss dry weight (Ew) was much smaller in the xerophytic species than in the mesophytic species. However, the evaporation rate per basal area of moss colony (Ea) was not necessarily smaller in the xerophytic species. The relation between Ea and dry weight per basal area of the colony (Wa) had a close correlation with the growth form. It was concluded that the difference in the evaporation rate per weight between the xerophytic species and the mesophytic species was largely due to the difference in Wa, and that the growth forms of the xerophytic species were suitable for increasing Wa without increasing surface roughness.

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Notes on water relations ofPolytrichum communeHedw.

Cited by 59 publications

References 6 publications

A multi-proxy, high-resolution record of peatland development and its drivers during the last millennium from the subalpine Swiss Alps

A multi-proxy, high-resolution record of peatland development and its drivers during the last millennium from the subalpine Swiss Alps

PHOTOSYNTHESIS IN DESICCATED SHOOTS OF POLYTRICHUM

The effect of growth form on the evaporation in some subalpine mosse

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