Response of photosynthesis of <i>Sphagnum</i> species from contrasting microhabitats to tissue water content and repeated desiccation

Schipperges, Barbara; Rydin, Håkan

doi:10.1046/j.1469-8137.1998.00311.x

Cited by 206 publications

(267 citation statements)

References 45 publications

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“…Increased potential evapotranspiration, owing to raised air temperatures, tends to reduce the water content of Sphagnum capitula, and experiments by Schipperges & Rydin (1998) have shown that growth is reduced if capitula are dry for extended periods. This may have significantly contributed to the temperaturerelated growth reductions observed in our study, since we frequently observed dry capitula in the plots with raised temperature when the capitula in the surrounding untreated plots were still saturated (even when the height above the water table was similar).…”

Section: Effects Of Raised Temperature and Increases In N And S Influmentioning

confidence: 99%

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

2004

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Summary• Growth and production of Sphagnum balticum and interspecific competition between S. balticum and either Sphagnum lindbergii or transplanted Sphagnum papillosum , were studied in a 4-yr field experiment in a poor fen.• Temperature and influxes of nitrogen (N) and sulphur (S) were manipulated in a factorial design. The mean daily air temperature was increased by 3.6 ° C with glasshouse enclosures. Nitrogen loads were increased 15-fold and S loads seven-fold compared with the natural loads up to influxes observed during the 1980s in southwestern Sweden.• Production of S. balticum decreased with increasing temperature and N-influx. The N treatment significantly reduced the incremental length of S. balticum , and this reduction was reinforced with time (24% in the first year to 51% in the final year). The area covered by S. lindbergii changed with time in all treatments and S. papillosum area increased significantly in the temperature-treated plots.• Growth, production and competitive patterns change if the environmental conditions change. Increased N deposition and raised temperature may transform mires currently dominated by Sphagnum into vascular-plant-dominated mires.

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Section: Effects Of Raised Temperature and Increases In N And S Influmentioning

confidence: 99%

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

2004

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“…This study is a part of a project aiming at an understanding of the distribution and abundance of Sphagnum species, based on their life history and ecophysiology (Rydin, 1986 ;Schipperges & Rydin, 1998 ;Sundberg & Rydin, 1998 ;Soro et al, 1999).…”

Section: mentioning

confidence: 99%

Experimental evidence for a persistent spore bank in Sphagnum

Sundberg

Rydin

2000

New Phytologist

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Spore capsules of four Sphagnum species were buried at different depths in peat on a bog. Spore viability was determined after 0, 1, 2 and 3 yr. Viability generally declined with time, but viable spores were still found at all depths after 3 yr. The light-coloured spores of S. balticum and S. tenellum retained their viability better than the darker spores of S. fuscum and S. lindbergii. Survival was highest under wet but aerobic conditions, but was also high under humid or periodically desiccated conditions. By contrast, most spores stored under wet, anaerobic conditions died within 2-3 yr. These results, and predictions from them, are not consistent with earlier results for spores of long-lived and dominant bryophytes, or for seeds of phanerogams of undisturbed wetlands and forests. There was no correlation between spore size and longevity across species, but the small spores from small capsules of S. balticum and S. tenellum generally showed higher viability than those from the medium-sized and large capsules of the same species. This suggests a positive intraspecific relationship between longevity and dispersal distance. There was an indication of conditional dormancy, controlled by weather, in Sphagnum spores. The experiments indicate that Sphagnum spores can form a long-term persistent spore bank under suitable conditions, with a half-life of between 1 and 20 yr (mean across species of 2n6 and 5n0 yr at two depths studied), and with potential values in individual spore capsules of several decades, or even of centuries. Sphagnum spores kept refrigerated showed 15-35% viable spores after 13 yr. The capacity to form a persistent spore bank that can be activated whenever favourable conditions occur might help explain the wide geographical distribution of many Sphagnum species in the boreal and temperate zones, where they have managed to colonize almost every suitable patch of acidic, nutrient-poor wetland.

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“…При избыточном увлажнении сфагнума, более 2000%, интенсивность фотосинтеза снижается и составляет 30-50% от максимальной величины у разных видов [Schipperges and Rydin, 1998;Jauhiainen and Silvola, 1999;Harley et al, 1989].…”

Section: результаты и обсуждениеunclassified

“…Как показывают исследования, выделение диоксида углерода с поверхности верхового болота в одних случаях больше зависит от температуры, в других -от влажности почвы [Курбатова с соавт., 2004; Курбатова с соавт., 2014; Наумов с соавт., 1999]. В условиях происходящих изменений климата, сопутствующее изменение осадков может иметь решающее значение для увеличения площади бореальных болот [Schipperges and Rydin, 1998]. Без наблюдений, прежде всего за уровнями почвенно-грунтовых вод на естественных и различно осушенных болотах, нельзя надежно утверждать, способствует ли в конкретном регионе изменение современного климата процессам разболачивания, или усиления болотообразования [Вомперский, 2009].…”

unclassified

Gas exchange of carbon dioxide from the surface of Sphagnum in boggy pine forests in southern taiga

Молчанов

Молчанов²

2017

Environmental Dynamics and Global Climate Change

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Response of photosynthesis of Sphagnum species from contrasting microhabitats to tissue water content and repeated desiccation

Cited by 206 publications

References 45 publications

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

Growth, production and interspecific competition in Sphagnum: effects of temperature, nitrogen and sulphur treatments on a boreal mire

Experimental evidence for a persistent spore bank in Sphagnum

Gas exchange of carbon dioxide from the surface of Sphagnum in boggy pine forests in southern taiga

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