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Master thesis

The influence of spring geophytes on soil CO2 efflux in a Common beech forest

Abstract : To define a forest as carbon sink or source the most important parameter is the soil carbon dioxide efflux (CO2). Several studies have been made to assess more precisely the involved factors. The influence of soil temperature and humidity on soil CO2 efflux has since long been known and both parameters are often included in current models. But there is still some variability that is more difficult to explain. Numerous factors, that have an effect on soil parameters, can impact the soil CO2 efflux. Recent studies showed that the fine root biomass (FRB) of trees had an influence on this efflux. These studies have led to modeling of FRB for different tree species and their use in respiration models with more or less success. A reason given to explain the lack of correlation between the modeled FRB (rFRB) was that the activity of spring geophytes could have an impact on the soil properties. Here, I show that the soil CO2 efflux of geophyte spots (~0.29 gC.m-2.hr-1) was significantly higher than that of non-geophyte spots (~ 0.27 gC.m-2.hr-1). However, no impact of the presence of geophytes was found on soil carbon (C), nitrogen (N) content, or C:N.
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Laura Heid. The influence of spring geophytes on soil CO2 efflux in a Common beech forest. Sciences de l'environnement. 2012. ⟨hal-01869813⟩

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