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Charles University in Prague (2011)

The changes of species composition of soil phototropic microorganisms on the altitude gradient in E Ladakh

Janatková Kateřina

Titre : The changes of species composition of soil phototropic microorganisms on the altitude gradient in E Ladakh

Změny druhového složení půdních fototrofních mikroorganismů v závislosti na nadmořské výšce ve východním Ladáku

Auteur : Janatková Kateřina

Université de soutenance : Charles University in Prague

Grade : Master Thesis 2011

Résumé
Abundance and diversity of microbial phototrophic communities (cyanobacteria and eukaryotic microalgae) were investigated at two localities in main mountain ranges of Ladakh (Tibetan Plateau and Eastern Karakoram), India. Samples were collected along a two representative altitudinal gradients at each locality (E Karkoram 4620 – 5100 m asl., Tibetan Plateau 5346 – 5833 m asl.) in alpine and subnival zones in the vicinity of cushion plant Thylacospermum caespitosum (Caryophyllaceae). At each altitude 6 soil samples were taken from below cushion and 6 samples from outside the cushion. The epifluorescent microscopy and DGGE-method were used to determine diversity and biomass of phototrophs in the studied soils. Physico-chemical analyses (pH, texture, organic matter, nitrogen, ammonia and phosphorus content, concentration of chlorophylls and carotenoids) were also performed on the samples. The effect of altitude, mountain ranges and T. caespitosum on the composition and biomass of phototrophs and physico-chemical parameters of soil was tested by multivariate redundancy analysis and variance partitioning procedure. This study shows that the semiarid and arid soil of high elevation in Ladakh Mts. is suitable place for the development of microbial phototrophic communities and is important part of the ecosystem. The community composition is unique to the climate and vegetation cover that delineates each ecosystem.

Mots clés : soil phototrophic microorganisms, altitudinal gradient, Ladak — půdní fototrofní mikroorganismy, výškový gradient, Ladak

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Page publiée le 14 octobre 2016, mise à jour le 27 août 2018