From an article in Sun Journal by Sara Wright.
According to studies done in Hungary and Denmark (Zlinszky/Molnar/Barfod) in 2017 trees do in fact have a special type of pulse within them which resembles that of a heartbeat.
To find this hidden heartbeat, these researchers used advanced monitoring techniques known as terrestrial laser scanning to survey the movement of twenty two different types to see how the shape of their canopies changed.
The measurements were taken in greenhouses at night to rule out sun and wind as factors in the trees’ movements.
In several of the trees, branches moved up and down by about a centimeter or so every couple of hours.
After studying the nocturnal tree activity, the researchers came up with a theory about what the movement means. They believe the motion is an indication that trees are pumping water up from their roots. It is, in essence, a type of ‘heartbeat.’ These results shocked everyone. At night, while the trees were resting slow and steady pulses pumped and distributed water throughout the tree body just as a human heart pumps blood. It has been assumed that trees distribute water via osmosis (a process that defies gravity and never made sense to me) but this and other new finding suggests otherwise.
Scientists have discovered the trunks and branches of trees are actually contracting and expanding to ‘pump’ water through the trees, similar to the way our hearts pump blood through our bodies. They suggest that the trunk gently squeezes the water, pushing it upwards through the xylem, a system of tissue in the trunk whose main job is to transport water and nutrients from roots to shoots and leaves.
But what “organ” generates the pulse?
Recently forest science researchers have found that the pulse is mostly generated by diameter fluctuations in the bark only. This was somewhat surprising, as traditionally it was thought that bark is totally decoupled from the transpiration stream of the tree. To better understand this mysterious situation, we need to have a closer look at bark.
For the complete article click here.
