2014
Responses of moss and lichen vegetation to manipulated warming: Long-term study exploiting OTC approach at James Ross Island, Antarctica
BARTÁK, Miloš, Peter VÁCZI, Kamil LÁSKA, Pavel PROŠEK, Josef HÁJEK et. al.Základní údaje
Originální název
Responses of moss and lichen vegetation to manipulated warming: Long-term study exploiting OTC approach at James Ross Island, Antarctica
Název česky
Odezva mechové a lišejníkové vegetace na manipulované oteplení: Dlouhodobá studie vyžívající přístup expozičních komor s otevřeným vrcholem z ostrova Jamese Rosse, Antarktida
Autoři
BARTÁK, Miloš (203 Česká republika, garant, domácí), Peter VÁCZI (703 Slovensko, domácí), Kamil LÁSKA (203 Česká republika, domácí), Pavel PROŠEK (203 Česká republika, domácí), Josef HÁJEK (203 Česká republika, domácí) a Josef HAVEL (203 Česká republika, domácí)
Vydání
SCAR Open Science Conference (Auckland), 2014
Další údaje
Jazyk
angličtina
Typ výsledku
Konferenční abstrakt
Obor
10600 1.6 Biological sciences
Stát vydavatele
Nový Zéland
Utajení
není předmětem státního či obchodního tajemství
Kód RIV
RIV/00216224:14310/14:00076372
Organizační jednotka
Přírodovědecká fakulta
Klíčová slova česky
ekofyziologie
Klíčová slova anglicky
ecophysiology
Příznaky
Mezinárodní význam, Recenzováno
Změněno: 9. 9. 2014 16:04, prof. Ing. Miloš Barták, CSc.
V originále
In 2007, several open top chambers (OTCs) were establised in three contrasting habitats: i) mossdominated coastal vegetation oasis (5 m a.s.l.), (ii) lichen-dominated plateau of a table mountain (350 m a.s.l.), and ice-free forefield of a cap glacier (410 m a.s.l.). The long-term study comprised evaluation of differences in microclimate between the OTCs and outside control plots as well as changes in vegetation cover and selected photosynthetic characteristics. For consecutive 7 years, continuous measurements of air temperature (30 cm above surface), vegetation cover and soil temperatures as well as air humidity have been done at the three habitats in 1 h interval. Vegetation in OTCs and at control plots were photographed each year so that OTCs-induced changes in vegetation cover could be evaluated. To estimate annual courses of photosynthetic activity of Bryum sp., a common moss species at the coastal plot, fluorometers were installed in OTCs and at contol plot to measure an effective quantum yield of photosynthetic processes in photosystem II. Additionally, numerous physiological measurements, such as e.g. responses to dehydration, high light and low temperature have been carried out on collected mosses and lichens in a laboratory under controlled conditions. Microclimatological measurements showed that mean annual air temperature increment in OTCs was lower for coastal plot than lichen-dominated table mountain plateau. However, positive vegetation response was found only for coastal plot. Similarly, soil temperature (5 cm depth) was OTC-affected in both habitats which may have consequences for soil microbial activity. Vegetation cover area increased in OTCs located at coast due to OTCs-affected growth of mosses. However, vegetation area was partly affected by episodic depositions of mineral particles transported by a strong wind from ice- and snow-free areas during austral summers. This resulted in a burrial of vegetation under several mm-thick layer. Lichen vegetation in OTCs located on a table mountain remained unaffected by elevated temperature. Chlorophyll fluorescence data revealed temperature-induced inhibition of Bryum sp. photosynthesis at the beginning of austral winter and several short-term episodes during winter when the moss is physiologically-active due to above-zero temperature. During summer season, data indicated water limitation and resulting inhibition of photosynthesis in Bryum sp. sensitively. The authors thank CzechPolar facility.
Česky
Odkazujeme na anglickou verzi anotace. Autoři děkují projektu CzechPolar za poskytnutí infrastruktury.
Návaznosti
| MSM 143100007, záměr |
|