Know more

Our use of cookies

Cookies are a set of data stored on a user’s device when the user browses a web site. The data is in a file containing an ID number, the name of the server which deposited it and, in some cases, an expiry date. We use cookies to record information about your visit, language of preference, and other parameters on the site in order to optimise your next visit and make the site even more useful to you.

To improve your experience, we use cookies to store certain browsing information and provide secure navigation, and to collect statistics with a view to improve the site’s features. For a complete list of the cookies we use, download “Ghostery”, a free plug-in for browsers which can detect, and, in some cases, block cookies.

Ghostery is available here for free: https://www.ghostery.com/fr/products/

You can also visit the CNIL web site for instructions on how to configure your browser to manage cookie storage on your device.

In the case of third-party advertising cookies, you can also visit the following site: http://www.youronlinechoices.com/fr/controler-ses-cookies/, offered by digital advertising professionals within the European Digital Advertising Alliance (EDAA). From the site, you can deny or accept the cookies used by advertising professionals who are members.

It is also possible to block certain third-party cookies directly via publishers:

Cookie type

Means of blocking

Analytical and performance cookies

Realytics
Google Analytics
Spoteffects
Optimizely

Targeted advertising cookies

DoubleClick
Mediarithmics

The following types of cookies may be used on our websites:

Mandatory cookies

Functional cookies

Social media and advertising cookies

These cookies are needed to ensure the proper functioning of the site and cannot be disabled. They help ensure a secure connection and the basic availability of our website.

These cookies allow us to analyse site use in order to measure and optimise performance. They allow us to store your sign-in information and display the different components of our website in a more coherent way.

These cookies are used by advertising agencies such as Google and by social media sites such as LinkedIn and Facebook. Among other things, they allow pages to be shared on social media, the posting of comments, and the publication (on our site or elsewhere) of ads that reflect your centres of interest.

Our EZPublish content management system (CMS) uses CAS and PHP session cookies and the New Relic cookie for monitoring purposes (IP, response times).

These cookies are deleted at the end of the browsing session (when you log off or close your browser window)

Our EZPublish content management system (CMS) uses the XiTi cookie to measure traffic. Our service provider is AT Internet. This company stores data (IPs, date and time of access, length of the visit and pages viewed) for six months.

Our EZPublish content management system (CMS) does not use this type of cookie.

For more information about the cookies we use, contact INRA’s Data Protection Officer by email at cil-dpo@inra.fr or by post at:

INRA
24, chemin de Borde Rouge –Auzeville – CS52627
31326 Castanet Tolosan CEDEX - France

Dernière mise à jour : Mai 2018

Menu Logo Principal Logo UCA

Home page

SUREAU

 SUREAU (Hydraulic Safety and Drought Resistance of Trees)

Leader : Stéphane HERBETTE

SUREAU staff

The SurEau team is analyzing the hydraulic functioning of trees and its link with severe droughts that can lead to their decline. 

Climate models predict an increase in the intensity and frequency of severe droughts, but little is known about the responses of trees, and more generally of ecosystems, to these events. Sap flows under tension in the xylem, and under the threat of cavitation (sap vaporization) when a drought exacerbates these tensions. This leads to a loss of xylem conductance, i.e. embolism. If embolism is too high, the organs are no longer supplied with water. The hydraulic safety of the tree thus plays a key role during severe droughts and it is on this process that the team focus its research efforts.  The main scientific objective of the SurEau team is to predict the risks of hydraulic failure leading to tree dieback, according to climate change scenarios.

To formulate hypotheses on these risks of hydraulic failure, we have the SurEau model. The development of this model was an opportunity to reconsider the resistance to drought by moving from an intensity scale (water potential) to a duration scale. Thus, understanding this resistance as the capacity to delay hydraulic failure leads us to reconsider the contribution of hydraulic safety traits. Assessing the role of these traits also implies characterizing their variability, especially in a changing climate context. Furthermore, to refine the model predictions, we need to elucidate the mechanisms of tree mortality and the link with hydraulic dysfunction.

The team is also developing original tools (Xyl'em, Cavitron, irrigation control, Drought-box) and acquiring others (microtomograph, optical method for measuring cavitation) to drive projects on the science front. Some of these tools are integrated into the Phenobois platform (Phenotyping of physico-chemical properties of wood and hydraulics of trees) of INRAE.

 

Presentation of HYDRO methods

 ©Photos PIAF