ITEX COMMUNITY SYNTHESIS WORKSHOP DATABASE
TOOLIK LAKE FIELD STATION, ALASKA, USA
2000 DATA

***** For permission to use these data, please contact the appropriate
principal investigator(s) (listed below).  *****

ITEX POINT-QUADRAT DATA DOCUMENTATION Documentation file:
README_USTOOL1_2000wrkshp.txt Data file: USTOOL1ptframe2000_wrkshp.txt

BRIEF DESCRIPTION OF DATA FILE:

Reduced vegetative community dataset produced for the ITEX Community
Synthesis Workshop.  Data were collected during the 2000 field season
using a fixed, 75 cm square point frame, with 100 measurements spaced 7
cm apart.  At each of 100 points per plot, the following information
was recorded in a spatially explicit format: species hit, condition,
woodiness and repeatability. Plot manipulations include 1) temperature:
warming (open top chamber) and control (no chamber) and 2) altered
snowpack: plots are established in a grid on the leeward side of a
snowfence which divides each site into 6 parallel zones that differ in
distance from the snowfence, and therefore, also in snow drift depth.
The experiment is established at both a moist tussock and dry tundra
site.

The experimental design and manipulation are described further in:

Walker, M. D. et al. (1999), Long-term experimental manipulation of
winter snow regime and summer temperature in arctic and alpine tundra:
an integrated ecosystem approach, Hydrological Processes, 13:
2315-2330.

Henry, G. H. R. and U. Molau (1997), Tundra plants and climate change:
the international tundra experiment (ITEX), Global Change Biology, 3:
1-9.

This file is reduced from the original (USTOOL1ptframe2000_archive.txt)
and does not include dead or standing dead species hits.  In addition,
species names were changed to reflect current accepted nomenclature
(see associated species file: USTOOL1_specieslist.txt).


SUMMARY OF VARIABLES

1.SITE: country/site/experiment
2.DATE: date of data collection; yyyymmdd
3.PLOT: unique plot number
4.WARMING: main ITEX treatment
5.LOCATION: site; moist or dry
6.ZONE: 0-6
7.CODE: hit; 6-8 character species or ground condition code
8.GFNARROW: narrow growth form category
9.GFBROAD: broad growth form category
10.CANOPYHT: height of hit by point (cm)
11.MICROTOP: height of hit with respect to lowest point in plot (cm)
12.XCOORD: X coordinate of point frame grid (cm)
13.YCOORD: Y coordinate of point frame grid (cm)
14.CONDITION: L (live) or O (other, for all non-living ground conditions)
15.WOODY: Y (yes), N (no), or O (other, for all ground condition entries)

DESCRIPTION OF SELECT VARIABLES

1. SITE

Alaska, USA; Toolik Lake Field Station; Comparative responses of moist
and dry arctic tundra to altered snow and temperature regimes


4. WARMING

ITEX temperature manipulation. OTC: Open-topped chamber, CTL: No
chamber (control)


6. ZONE

Snow manipulation.  A 60 m snowfence is aligned on an east-west axis at
both the moist and dry sites. Both snowfences are perpendicular to the
predominant winter winds from the Brooks Range to the south,
effectively creating a leeward drift 50-60 m long on the north side of
the fence.  An established grid on the north side of the fence divides
the drift into 6 parallel zones (60 m x 10 m).  Zone number increases
from 1 to 6, as distance from the snowfence increases.  Zones 1, 2 and
3 accumulate the most snow (2-3 m), while zones 4, 5 and 6 accumulate
the least snow (0.5-2 m).  Zone 0 (the control) is located adjacent to
the snowfence grid and does not receive supplemental snow.


7. CODE

See associated species file (USTOOL1_specieslist.txt) for species code
and ground condition definitions.


8. GFNARROW (Narrow growth form categories):

Shrub: SEVER (evergreen), SDECID (deciduous), SHRUBU (unknown shrub)
Grass: GRASS Sedge: SEDGE Rush: RUSH Unknown Graminoid: GRAMINU Forb:
FORB Seedless vascular plant: SLVASC (Lycophyta, Sphenophyta,
Pteropyta) Lichen: LFOLI (foliose), LFRUT (fruticose), or LCRUS
(crustose), LICHENU (unknown lichen) Moss: SPHAG (Sphagnum), MACRO
(acrocarp), MPLEU (pleurocarp), MSEMI (semi-prostrate), MPOLY
(Polytrichale), MOSSU (unknown moss).  Liverwort: LIVERTH (thalloid),
LIVERLE (leafy), LIVERU (unknown liverwort) Unknown Bryophyte: BRYOU
Fungus: FUNGUS Algae: ALGAE


9. GF BROAD (Broad growth form categories):

Shrub: SHRUB Graminoid: GRAMIN Forb or Seedless Vascular: FORBSV
Lichen: LICHEN Moss: SPHAG (Sphagnum), MOSS Liverwort: LIVER Unknown
Bryophyte: BRYOU Fungus: FUNGUS Algae: ALGAE


15. WOODY

Location of hit for a woody plant.  Y: yes (hit woody), N: no (hit not
woody or hit not a woody plant), O: other (hit non-living ground
condition)


NOTES AND COMMENTS:

No repeatability data was recorded in 2000.  Plot 304 was not sampled
in preceding years.

LOG OF CHANGES TO DATA FILE:

None to date.


LOCATION OF ORIGINAL DATA SHEETS:

Boreal Ecology Cooperative Research Unit, University of Alaska,
Fairbanks, Alaska, USA


DOCUMENTATION:

Amy Breen Carroll, 8 January, 2001


PRINCIPAL FIELD WORKERS:

Katie Hamilton, Research Technician Kimberley Maher, Research
Technician Adam Wilson, Research Technician


PRINCIPAL POSTDOCS:

Michael H. Jones Anna Arft


PRINCIPAL INVESTIGATORS:

Marilyn Walker (mwalker@lter.uaf.edu) Boreal Ecology Cooperative
Research Unit P. O. Box 756780 University of Alaska-Fairbanks
Fairbanks, Alaska 99775-6780 USA


PUBLICATIONS WHICH INCLUDE THESE DATA:

None to date.