Eavesdropping on thirsty trees

Loose Leaf Blog:

It’s long been known that cavitations — air bubbles that block the flow of water throughout the tree — make a sound that can be heard with a microphone. If too many of these cavitations occur, such as we might see in drought conditions, a tree can die.

The problem is that the sounds of cavitations, among other tree activity, are outside our usual range of hearing and can only be heard with the proper equipment. Then, the question of how to tell which sounds are indicative of cavitations — and therefore early warning signs of drought stress — was a bit of a doozy.

Until now. A team of scientists from Grenoble University, Saint-Martin-d’Hères in France, led by physicist Alexandre Ponomarenko, presented a study at last month’s meeting of the American Physical Society that seems to hold the promise of a day when what is now lost in translation could be found. Using a gel capsule-like device developed by Cornell University’s Dr. Abraham Stroock, the scientists were able to take a peek inside a simulated tree and observe the cavitations and other activity at the same time sounds were being recording. Cross referencing the visual and audio data, they were able to distinguish the sounds that corresponded with cavitations from other sounds, such as fractures in the wood.

About Dave Bonta

I live in an Appalachian hollow in the Juniata watershed of central Pennsylvania, and spend a great deal of time walking in the woods. My books of poetry include FAILED STATE: HAIBUN, ICE MOUNTAIN: AN ELEGY, BREAKDOWN: BANJO POEMS, and ODES TO TOOLS.

Posted on April 25, 2013, in Drought, Music and tagged . Bookmark the permalink. Leave a comment.

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

%d bloggers like this: