I am focused on the development of tree-ring chronologies within gradients of nutrient availability in French Guiana and in fertilization experiments, using classical dendrochronological approaches plus tree-ring isotopes techniques. I am also interested in the effects of experimental fertilization and nutrient availability on the linkage between belowground water movement mediated by roots (hydraulic lift and downward siphoning) and root nutrient uptake. More generally, I would like to explore the effect of nitrogen addition and/or phosporus limitation on plant water relations of tropical, mediterranean and temperate forests.