Atmospheric #drought i.e. high water vapor pressure deficit (#VPD) of the air is one reason for #treemortality. First tests for #VPDmanipulation at the #Pfynwald in #Switzerland - we reduce VPD in a > 100 year old Scots pine forest exposed regularly to dry air: https://www.wsl.ch/de/projekte/a-novel-approach-to-disentangle-atmospheric-and-soil-drought.html

#Chlorophyll #Fluorescence #Measurements at the experimental #forest field site #Pfynwald - airborne measurements with the #HyPlant (https://www.fz-juelich.de/en/ibg/ibg-2/expertise/technology-process-development/hyplant) sensor from FZ Jülich and groundtruthing in the canopy.

The Swiss Federal Research Institute WSL (Marcus Schaub) and EPFL (Charlotte Grossiord) received funding from @SNF_ch for a new #ClimateChange #Experiment in an old growth #Forest. An existing #Irrigation experiment (started in 2003: https://esajournals.onlinelibrary.wiley.com/doi/full/10.1002/ecm.1507?utm_campaign=RESR_MRKT_Researcher_inbound&af=R&utm_medium=referral&utm_source=researcher_app&sid=researcher) will now be completed by roofs to reduce #Precipitation. In addition we will manipulate water vapor pressure deficit to disentangle #Atmospheric from #Soil #Drought (#Pfynwald).