Indeed, it has been some time since I observed some "bizarre" movements on plants in the garden (such as: a leaf or a small branch which moves while the others around are strictly motionless and there is no , of course, no wind) ... obviously we know all the flowers that close during the night ...
And here is this news:
At night, the trees go into a “sleeping” position
At night, the trees change posture and fall into a sleeping position. This was measured by a team of scientists from Austria, Finland and Hungary.
Within an hour of sunset, the entire tree begins to collapse. A tree 5 m high can tilt 10 to 15 cm during the night. The branches and leaves follow the same movement, lowering by 5 to 10 cm. Then, at sunrise, the tree returns to its initial posture, within a few hours.
This is the conclusion reached by a team of researchers from the Finnish Geospatial Research Institute, the Center for Ecological Research of the Hungarian Academy of Sciences, and the Technical University of Vienna (Austria). They just published their results in Frontiers in Plant Science.
The study focused on white birches (Betula pendula), observed using a terrestrial laser scanning technology (TLS). The researchers conducted their observations on two sites with 14 individual scans in Finland and 77 in Austria, carried out between sunset and sunrise.
http://www.humanite-biodiversite.fr/art ... de-sommeil
http://www.forestopic.com/fr/arbre/scie ... nt-la-nuit
