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Weaver - early prairie research

Hi all, at the recent North American Prairie Conference I picked up a copy
of Weaver's "The Prairie", documenting prairie research back in the 1930s.
He repeatedly makes reference to the amount of bare space created by certain
forbs, noting the impact to hay production - less grass.  I wonder if this
information contributed to the "de-forbing" of prairie areas by manual and
chemical means, and if this in turn has influenced declines in grassland
birds - under the assumption that bare space is a good thing in prairies.
Anyone have any comments or further information about this??

Thanks,
Scott Lenharth
http://www.texasprairie.org

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