hello Kiran ji that was really interseting i want ot know more abt it. can i get the reference or the link.
satish Pardeshi kiran srivastava wrote: > An interesting note I came across on the internet: > > “Ever heard a tree singing?” asks noted composer and bioacoustician Bernie > Krause. “It's 70 kHz,” he adds as he reaches for a CD-R in his spartan > Northern California studio. > > “We were listening for the sounds of bats,” Krause continued, “which are up > in the 47-plus kHz range. And we heard a steady signal, very unbiological in > the sense of it being from a creature. As we moved closer to this cottonwood > tree, the signal level increased. We drilled a little hole in the tree and > put this hydrophone in. We had an instrumentation device with us that could > record a frequency that high, and we got a signal coming from the trunk of > the tree. We couldn't figure out what it was. Then we slowed it down by a > factor of seven, to get it down within our hearing range.” As we listened to > the tree's music, I was startled by the regularity of its pulse and the > subtle rhythmic accents. It was as if we were hearing a recording of a > virtuosic percussionist playing woodblocks. > > “What we discovered was that during a drought, the cells in the xylem of the > tree usually maintain a certain pressure from the water that comes into the > trunk of a tree during normally wet seasons,” Krause explained. “When that > pressure drops during a drought, the cells automatically fill with air, to > try to maintain the osmotic pressure. And when they get too dry and they're > pumping in air, they pop. When they pop, they die, and the dead cells form > the tree's rings. So, when they pop, they make a noise: we can't hear it, > but insects can. And when insects hear multiple cells popping, they're drawn > to the tree because certain ones are programmed to expect sap. And when the > insects are drawn to the tree, the birds are drawn to the tree to eat. It's > all a microhabitat formed by sound.” > > Cheers, > Kiran Srivastava > Mumbai --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "indiantreepix" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.co.in/group/indiantreepix?hl=en -~----------~----~----~----~------~----~------~--~---
