Doctorant

PhD defended at the CEFE the 30 of March 2012

 
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My work aims at understanding how trees and more generally forests are affected by environmental changes caused by humans. Because drought prone areas have substantially increased over the world during the last decades, I became particularly interested in the drought responses of trees.

The processes I study are typically ecophysiological and include plant and ecosystem gas exchanges, water relation in trees (safety and efficiency), biomass allocation in tree, cambial growth, and phenology.

My research focuses principally on Mediterranean and temperate species and involves both experiments and models. Based on field experiments I try to improve our mechanistic understanding of the plant responses to the environment. Then I reintegrate this knowledge into process based models of forest functioning to make them more operational in predicting the outcome of trees and forest in the future.

A last topic of my research is to evaluate the most likely effects of future climate change on forest. This involves reducing (or at least assessing) the uncertainties in our projections of trees and forests outcomes under climate change. In this topic, I work in close collaboration with climatologists. Together, we try to understand whether and how the uncertainties related to the dynamic simulation of climate (in term of model parameterization, model structure and the spatial resolution) affects the results of the simulations of trees and forests persistence.

I am now working as a Post-Doc with Paul Leadley, Christophe François and Eric Dufrêne at the University of Paris Sud (http://www.ese.u-psud.fr/rubrique94.html?lang=fr). Do not hesitate to send me an email: Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser., Cette adresse e-mail est protégée contre les robots spammeurs. Vous devez activer le JavaScript pour la visualiser.

Published and accepted peer-reviewed articles

Martin StPaul NK, Limousin JM, Rodríguez-Calcerrada J, Ruffault J, Rambal S, Letts MG & Misson L (2012) “Photosynthetic sensitivity to drought varies among populations of Quercus ilex along a rainfall gradient” Functional Plant Biology 39(1), 25--37.

Martin-StPaul NK, Limousin JM, Vogt-Schilb H, Rodriguez-Calcerrada J, Rambal S,  Longepierre D & Misson L (2013)  “The temporal response to drought in a Mediterranean evergreen tree: comparing a regional precipitation gradient and a throughfall exclusion experiment” Global Change Biology (in press).

Limousin JM, Misson L, Lavoir AV, Martin NK & Rambal S (2010) “Do photosynthetic limitations of evergreen Quercus ilex leaves change with long-term increased drought severity?” Plant Cell and Environment 33(5), 863-875.

Rodríguez-Calcerrada J, Limousin JM, Martin-StPaul NK, Jaeger C & Rambal S (2012) “Gas exchange and leaf aging in an evergreen oak: causes and consequences for leaf carbon balance and canopy respiration” Tree Physiology 32(4), 464--477.

Ruffault J, Martin-StPaul NK, Rambal S & Mouillot F (2013) “Differential regional responses in drought length, intensity and timing to recent climate changes in a Mediterranean forested ecosystem” Climatic Change 117(1-2), 103-117

Submitted articles

Rodríguez-Calcerrada J, Martin-StPaul NK, Lempereur M,Ourcival JM, del-Carmen del-Rey M, JoffreJ & Rambal S “Seasonal variations of stem CO₂ efflux in Quercus ilex: causes and clues for upscaling” (Submitted toFunctional Ecology)

Lempereur M, Martin-StPaul NK, Damesin C, Ourcival JM & Rambal S “What limit secondary growth of Quercus ilex in a Mediterranean coppice?” (Submitted toNew Phytologist)

Ruffault J, Martin-StPaul NK, Duffet C, Goge F, Mouillot F. Sensitivity of a forst drought model to two RCM bias correction methods in a Mediterranean region. (Submitted to Theoretical and Applied Meteorology)

Shahin O, Martin-StPaul NK, Selosse MA, Joffre R, Richard F “Ectomycorrhizal fungal diversity in Quercus ilex Mediterranean woodlands: variation among sites and over soil depth profiles in hyphal exploration types, species richness and community composition”(Submitted to Symbiosis)

Articles in preparation

Martin-StPaul NK, Longepierre D, Huc R, Delzon S, Burlett R, Joffre R, Rambal S, & Cochard H “Deciphering ‘s’marts from ‘r’ubbish VCs: going further the matter of letters”(in prep for Tree physiology, special issue for the Meeting WSE 2013, Naples, Italia)

Martin-StPaul NK, Lempereur M, Delpierre N, Ourcival JM, Davi H, Francois C, Leadley P, Dufrene E Joffre R & Rambal S “What are the processes driving carbon allocation to stem and fine roots in a mature coppice of Quercus ilex ? A data model analysis” (in prep for Annals of botany, special issue for the Meeting FSPM 2013, Saariselkä, Finland)

Martin-StPaul NK, Ourcival JM, Chuine I, Rambal S & Delpierre N “Assessing the role of temperature, water deficit and hydraulic conductivity on theleaf phenology of Quercus ilex” (in prep for New Phytologist)

Martin-StPaul NK, Ruffault J, Francois C, Stéfanon M, Drowbinsky P, Delpierre N, Soudani K, Dufrêne E & Leadley P “The spatial resolution of climate modify the simulations of tree persistence at the edge of tree range” (in prep for Global Change Biology)

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