\log
The documentation section of this file was created by Mariah Carbone on
5 May 2001. Additional comments were added to the file by Tim Seastedt
on 9 May 2001. This file was put under sccs control on 15 May 2001.[TMA
15 May 2001]
\doc
TITLE. Plant species richness (density) associated with krummholz.
ABSTRACT. Species richness (density) on one meter sq. plots were
measured on windward and leeward sides of krummholz trees previously
studied by Seastedt and colleagues. Species richness of adjacent dry
meadow tundra areas was also sampled.
The results indicate that species richness is initially increased by
the passage of tree islands. Richness was higher in leeward areas than
on either windward or open tundra sites. The hypothesis that successional
species must tolerate low nitrogen conditions found in the windward sites
of tree islands was not supported by findings obtained here.
INVESTIGATOR. Tim Seastedt, INSTAAR, CB 450, University of Colorado,
Boulder, CO, (303) 492-3302 Timothy.Seastedt@Colorado.Edu (REU student
= Elizabeth Polling)
VARIABLES. Plant species richness.
KEYWORDS. Krummholz, tree island, leeward, windward, tundra, nitrogen,
plant species richness.
LOCATION. Samples were obtained at 10 tree islands located in the T-van
meadow area, the location of previous krummholz work.
TIMING. Summer 2000.
CITATIONS.
COMMENTS. Data were obtained by inventorying all species found in one
square meter quadrats placed at random within two meters of windward and
leeward areas of the islands. The open tundra location was taken 5 m to
the south of the trees, or to the north of the tree if the presence of
another tree or habitat other than dry meadow tundra occurred to the south
of the tree.
\type
statistical
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{*********************************************************************
If the data section below contains no data then you will need to
obtain permission from the investigator listed in the documentation
section of this file. If you have obtained permission or if the data
are already contained in this file, include the following
acknowledgment (in addition to an acknowledgment of the investigator)
in any published use of these data: "Logistical support
and/or data were provided by the Niwot Ridge Long-Term Ecological
Research project (NSF DEB 0423662) and the Mountain Research Station
(BIR 9115097)." Please send 4 reprints or high-quality copies of any
such publications to Todd Ackerman, NWT LTER data manager,
INSTAAR, CB 450, University of Colorado, Boulder, CO, 80309-0450.
The data contained in these files have many sources. Generally,
data collected prior to 1993 would have been subjected to quality
control standards imposed by the investigator. Data after 1992
were likely to have been manually entered and/or processed in the
NWT LTER central data management laboratory. Detailed information
on the quality control protocols and programs associated with any
data routed through the NWT LTER data management laboratory will
be supplied upon request. The user of these data should be aware
that, while efforts have been taken to ensure that these data are
of the highest quality, there is no guarantee of perfection for
the data contained herein and the possibility of errors exists.
If you encounter questionable data, please contact the NWT LTER
data manager (todda@culter.colorado.edu; (303) 492-4771) so that
the data can be corrected or qualified. Thus, these data should
be considered dynamic in that past data may be modified and future
data will be appended.
******************************************************************}
\data
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893,leeward,0,0,1,0,4,2,2,0,0,1,3,0,11,0,0,0,0,0,0,0,0,1,49,0,0,0,0,0,0,0,3,0,0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0,0,0,21
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999,leeward,0,8,7,0,0,5,3,4,3,0,1,0,4,0,0,0,4,0,0,0,0,0,0,1,0,1,0,2,0,0,2,0,0,0,0,0,0,3,0,4,6,0,7,0,0,0,0,0,0,0,35