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Thesis defence « Grassland species root functional strategies to face abiotic and biotic stresses »

Abstract
In order to optimise grassland ecosystem services we need to improve our understanding of root system functioning. As a result, we decided to characterise strategies of species coming from grassland’ Fabaceae and Poaceae families, by root functional traits measurement.
The main result of this work is the establishment of several axes of root strategies differentiation. The main axis is the trade-off between resources capture and conservation
strategies. Species with capture strategies appear to be adapted to non-water stressful habitat and are barely impacted by phosphorus shortage; they also happen to be strong competitors.
On the opposite, species with conservation strategies are adapted to water stressful continental climates, but are strongly impacted by phosphorus shortage and happen to be weak competitors. The kind of relation between above-ground and below-ground strategies also appears to be a marker of the plants adaptation to stress.
We showed that the root system study is a good way to predict grassland species comportment to face abiotic and biotic constraints. The present work widens interesting perspectives for the sowing of mixed grassland species better adapted to their environments.

Publicités

SUMMER SCHOOL Facilitation process for nutrients acquisition in pluri-specific plant populatings

OBJECTIVES

• Master the theories and the concepts of the ecology applied to the functioning of the pluri-specific plant populatings.
• Distinguish the advantages and the limits of  models and experimental approach susceptible to be mobilized for quantifying the sharing of the  nutriments in these populatings.
• Elaborate a research strategy  to test the validity of various process of interaction (facilitation / competition, etc.) within this kind of populatings, in diverse kind of agro-systemic contexts.

Flyer   /   Form

Language of the summer school : FRENCH

The interested persons have to make a request with Mrs H. Guillemain ( helene.guillemain@cirad.fr ) before April 30th, 2012.

ISRR 2012: « Roots to the Future »

26-29 June 2012 Dundee, Scotland

The eighth symposium of the International Society of Root Research (ISRR), to be held in summer of 2012 in Dundee, UK, will mark the 30th anniversary of the Society’s founding and its first meeting in the UK.