As part of the PEPR FORESTT X-Risks project, oak leaf samples were collected from resprouts in early September. Out of a total of 1,200 leaves (from low-density plots), measurements of pigments and nitrogen (using the Dualex device), as well as traits such as specific leaf area (SLA), and observations of damage caused by herbivorous insects (see photo) were conducted. The goal is to assess the combined effect of water stress risk and herbivory (including chewers, sap feeders, gall makers, skeletonizers, and the presence of stink bugs) depending on the stand composition.
This protocol—excluding Dualex measurements—is also being implemented in two other networks: ORPHEE (led by Hervé Jactel) and GMAP (led by Xavier Morin), focusing on other oak-based mixtures. These measurements will be repeated over a period of four years. The individuals being monitored are marked with tape (see photo).
