Studies in the Biology and Ecology of Rhacomitrium Lanuginosum Brid.: II. Growth, Reproduction and Physiology

Tallis, John

doi:10.2307/2257370

Cited by 96 publications

(44 citation statements)

References 16 publications

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“…Under these circumstances the high rate of sustained respiration which is possible may deplete the cells energy reserves to below the level required to maintain the normal cellular location of ions. Tallis (1959) has shown respiration to be maximal in this species at 100% r.h. and Dilks and Proctor (1974) reported it to be less able to tolerate storage at 76 than at 32% r.h.…”

Section: Discussionmentioning

confidence: 70%

Desiccation Effects and Cation Distribution in Bryophytes

1979

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SUMMARYAnalysis of the cations in a range of bryophytes, using a differential ion displacement technique, has shown that potassium is mainly soluble within the cells, calcium is bound, exchangeably, to sites in the cell wall and is insoluble within the cell and magnesium is present in all three locations. After desiccation, soluble ions either leak into the rehydrating solution (e.g. potassium and some magnesium) or become bound to the cell-wall exchange sites (e.g. most of the magnesium). Leakage of intracellular ions can be used as a measure of membrane damage. An index of desiccation resistance (based on potassium retention within the cells after storage at 52 and 100% r.h.) is related to the availability of water in each bryophyte's habitat and is significantly correlated with the total potassium content of the plant. Reduced cation leakage occurred after material was transferred from either 52 or 0 % r.h. to 100 % r.h., indicating the ability of bryophytes to recover from such desiccation stress. An index of recovery is presented which shows that naost bryophytes, unless excessively stressed, are able to repair the damage caused by desiccation.

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Section: Discussionmentioning

confidence: 70%

Desiccation Effects and Cation Distribution in Bryophytes

1979

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“…Neckera crispa from dry limestone rocks showed an appreciable stimulation of photosynthesis at 50 and 15% relative humidity over the rate at 98 %. This stimulation may he a reflection of impaired assimilation at high moisture contents as observed by Tallis (1959) for Rhacomitrium lamiginosum. Two species from intermediate habitats, Acrocladium cuspidatum and Climacium dendroides (dry races), were intermediate in their photosynthetic responses to desiccation.…”

Section: Photosynthesis As An Indicator Of Desiccation Injurymentioning

confidence: 81%

Desiccation Injury in Mosses

Lee

Stewart

1971

New Phytologist

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SUMMARYIntra-speclfic differences in desiccation injury are shown in collections of Acrocladium cuspidatum, Climadum dendroides and Hypnum cupressiforme from habitats subjected to a wide range o moisture stresses. The degree of desiccation tolerance is correlated with degree of moisture stress in the habitat. Desiccation injury was measured as the decline in the initial rate of photosynthesis on remcistening. Collections of species from habitats in which severe moisture deficits occur show a slower decline in photosynthesis on desiccation and a more rapid recovery of function on wetting than collections from hahitats with no appreciable moisture deficits. The results are discussed in terms of their ecological and physiological significance.

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“…The rims feature a considerably higher surface roughness than the watersaturated polygonal centres due to the dendritic growth form of the dominant moss species (Hylocomium splendens). This difference in growth form of the mosses can strongly modify water loss from the moss canopy (Tallis, 1959;Hosokawa et al, 1964) and potentially lower the resistance to ET on the rims. Additionally, the elevated polygonal rims are more exposed to wind, all of which could lead to generally increased turbulent heat fluxes at the polygonal rims with a shift towards higher latent heat fluxes.…”

Section: Plot-scale Et Characteristicsmentioning

confidence: 99%

Subpixel heterogeneity of ice-wedge polygonal tundra: a multi-scale analysis of land cover and evapotranspiration in the Lena River Delta, Siberia

Muster¹,

Langer²,

Heim

et al. 2012

Tellus B: Chemical and Physical Meteorology

128

174

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A B S T R A C TIgnoring small-scale heterogeneities in Arctic land cover may bias estimates of water, heat and carbon fluxes in large-scale climate and ecosystem models. We investigated subpixel-scale heterogeneity in CHRIS/PROBA and Landsat-7 ETM' satellite imagery over ice-wedge polygonal tundra in the Lena Delta of Siberia, and the associated implications for evapotranspiration (ET) estimation. Field measurements were combined with aerial and satellite data to link fine-scale (0.3 m resolution) with coarse-scale (up to 30 m resolution) land cover data. A large portion of the total wet tundra (80%) and water body area (30%) appeared in the form of patches less than 0.1 ha in size, which could not be resolved with satellite data. Wet tundra and small water bodies represented about half of the total ET in summer. Their contribution was reduced to 20% in fall, during which ET rates from dry tundra were highest instead. Inclusion of subpixel-scale water bodies increased the total water surface area of the Lena Delta from 13% to 20%. The actual land/water proportions within each composite satellite pixel was best captured with Landsat data using a statistical downscaling approach, which is recommended for reliable large-scale modelling of water, heat and carbon exchange from permafrost landscapes.

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Studies in the Biology and Ecology of Rhacomitrium Lanuginosum Brid.: II. Growth, Reproduction and Physiology

Cited by 96 publications

References 16 publications

Desiccation Effects and Cation Distribution in Bryophytes

Desiccation Effects and Cation Distribution in Bryophytes

Desiccation Injury in Mosses

Subpixel heterogeneity of ice-wedge polygonal tundra: a multi-scale analysis of land cover and evapotranspiration in the Lena River Delta, Siberia

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