Étude de la sensibilité du métabolisme des sphaignes et de l'andromède en réponse aux variations climatiques

Abstract : In a warmer future, peatlands may change from a carbon sink to a carbon source function. Carbon sequestration in peatland is mainly ensured by Sphagnum and a little by vascular plants. Aiming at studying vegetation dynamics in a climate warming context, The SphagnAndro project started in 2014. A strong hypothesis is the existence of chemical relations between Sphagnum and Andromeda by phenolics compounds that regulate plant and microbial communities. This project has two objectives : i) characterizing the primary and secondary metabolisms and enzymatic activities of Sphagnum and Andromeda along a fen-bog ecological gradient and ii) describing the effect of an increased temperature on this communication by the installation of open-top chambers « OTC » . The increased temperature had no significant effect on primary metabolites contents (total carbone, total nitrogen, amino acids, nitrates and soluble sugars). However, our data suggest a metabolic distinction between the top and bottom segments of Sphagnum confirming the known phenolic distribution. Seasonal biochemical contents fluctuations were highly dependent on soil and climate conditions (temperature, water table, rainfall) and variable along the fen–bog gradient.
Document type :
Master thesis
File URL :
http://docnum.univ-lorraine.fr/prive/BUS_M_2015_FOURSOV_GUILLAUME.pdf
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https://hal.univ-lorraine.fr/hal-01769666
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Submitted on : Wednesday, April 18, 2018 - 11:39:50 AM
Last modification on : Thursday, April 19, 2018 - 1:13:26 AM

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Guillaume Foursov. Étude de la sensibilité du métabolisme des sphaignes et de l'andromède en réponse aux variations climatiques. Sciences de l'environnement. 2015. ⟨hal-01769666⟩

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