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Re: Recording tree sap...

Subject: Re: Recording tree sap...
From: "Bernie Krause" bigchirp1
Date: Sat Dec 14, 2013 6:41 am ((PST))
Yes, Serge. Check out this BBC segment with Sir George Martin (Beatles=92 p=
roducer), who was filming a piece on the historical origins of music and wa=
nted to include something on natural sound. While the sound of the cottonwo=
od tree is correct and real, the reason for its audio signature, as explain=
ed in the piece, is wrong.

The reason for that particular sound (other than the sound of nutrients mov=
ing up and down the xylem and phloem which is more whoosh-like) is that aft=
er a period of drought, the cells suck in air to maintain osmotic pressure.=
 When the pressure becomes too great and the cell walls fail, they generate=
 a faint pop, the sound captured in this example. The dead cells for the ri=
ngs, etc.  Normally, the popping sounds are more static-like. But in this c=
ase I found a segment of the recording (formerly at around 70kHz and slowed=
 up by a factor of 7) that was pretty rhythmic and used that as an example.

Bernie Krause

On Dec 13, 2013, at 9:43 PM, Serge Le Huitouze <>=

> Hi there,
> Just saw the documentary below (that's replay TV, visible until Tuesday):
> It's in French, but that's not so important for my point.
> At 38'25'', one sees an old Japanese lady listening to the sound of
> the sap flowing inside a tree (she previously took off a bit of bark).
> And she pretends to hear something!
> Do anyone knows of some recordings thereof?
> Thanks in adavance.
> --Serge
> ------------------------------------
> "While a picture is worth a thousand words, a
> sound is worth a thousand pictures." R. Murray Schafer via Bernie Krause.
> Yahoo Groups Links

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POB 536
Glen Ellen, CA 95442

SKYPE: biophony
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