Anne Alexandre (CEREGE)
in collaboration with LSCE, IMBE, ECOTRON, O3HP
Subtitle
Task1.2 : Evaluate water budget and forest response to water deficit/Acquisition of a laser
This project is part of a broader project (“HUMI-17: Dynamics of continental atmospheric humidity and vegetation response: new insights from the triple isotope composition of oxygen”; partly supported by LEFE (INSU) in 2016 and by the ANR for the 2017-2020 period.
The laser spectrometer (120k€ including its onsite set up), co-funded by OT-Med, was acquired and set up at the O3HP observatory in fall 2018. The spectrometer measures the triple oxygen isotope composition (17O-excess) of the water vapor in continuous mode. In addition to the monitoring of soil water, precipitation and plant water isotope compositions, it is used to investigate how the different environmental parameters combine to drive the evolution of the 17O-excess in the natural water cycle at the soil/plant/atmosphere interface.
This monitoring should help us to better understand how plants respond to water deficit.
Equipment purchased in this project