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:
README2000_USTOOL1_biomass.txt Data file:
USTOOL1ptframe2000_biomass.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 only includes plots in which hit quantity was recorded.  In
addition, this file does not include dead or standing dead species
hits.  Species names were also 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) 
16.QUANTITY: number of hits


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)

16. QUANTITY

Hit quantity for a species at a single x, y coordinate.  Height was not
recorded for quantity hits.


NOTES AND COMMENTS:

No repeatability data was recorded in 2000.


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.