Photosynthetische Primärproduktion von epigäischen Flechten im „Mainfränkischen Trockenrasen”
1989; Elsevier BV; Volume: 182; Issue: 3-4 Linguagem: Inglês
10.1016/s0367-2530(17)30418-8
ISSN1618-0585
AutoresSabine Hahn, D. Speer, A. Meyer, O. L. Lange,
Tópico(s)Bryophyte Studies and Records
ResumoMicroclimate, water content and CO2 exchange were investigated in three lichen species from the "Mainfrankischen Trockenrasen" in their natural environment (Franconia, Northern Bavaria). The research site, located on top of the bluffs of the Main river valley, is in an area of limestone formations. The rare xerothermic vegetation unit, a local steppe formation (Xerobromion sward), naturally contains a high proportion of cryptogams. The measurements were taken throughout the highly active part of the year between April and November. Climatic conditions and water contents were simultaneously recorded, while CO2 exchange was measured during the light period. For each season of the year there were specific cases of weather conditions which could be classified into uniform types, and the related responses in net photosynthesis and water status of the lichens are described in schemes and diurnal courses. Further results, as general light and water content dependent photosynthesis curves derived from the measured parameter, and seasonally shifting photosynthesis responses which occurred in some species, are discussed.
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