dmaroni at EMAIL.UNC.EDU
Thu Sep 4 21:06:25 CEST 1997
Tony Avent wrote:
> While many that we found were quite deep, it appeared that this was due to
> sedimentation, and not to the arisaema pulling itself deeper. In fact the
> A. franchetianum that we found on a dry dusty bank were literally almost on
> top of the ground.
I doubt that 'sedimentation' could account for the bulbs/corms moving
deeper. More likely, bulbs/corms would be subject to the same forces that
move rocks to the surface. As reported in one of the scientific journals
a year or two ago, experiments show that rocks move to the surface because
smaller soil particles are washed or sifted downward around the larger
rocks and gradually displace larger bodies--the rocks--upward.
How about erosion of the banks as an explanation for the A. franchetianum
bulbs being on the surface?
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