TITLE:

Toolik Snowfence Experiment: 1995-2001 Moist site Eriophorum vaginatum pedicel 
length data


PRINCIPAL INVESTIGATOR:

Dr. Marilyn Walker Leader, Boreal Ecology Cooperative Research Unit
USFS PNW Research Station and University of Alaska Fairbanks

Boreal Ecology Cooperative Research Unit
School of Agriculture and Land Resources Management
P.O. Box 756780
University of Alaska Fairbanks
Fairbanks, AK 99775-6780
Phone: 907-474-2424 
Fax: 907-474-6251
E-mail: ffmdw@uaf.edu


FUNDING SOURCE:

National Science Foundation 


ARCTIC SYSTEM SCIENCE PROGRAM:

Land-Atmosphere-Ice Interactions (LAII) and The International Tundra Experiment
 (ITEX)


GRANT TITLES AND GRANT NUMBERS:

1994 - 1998: OPP-9400083 -- ITEX / Comparative Responses of Moist and Dry      
Arctic Tundra to Altered Snow and Temperature Regimes

1999 - 2003: OPP-9907127 -- ITEX / Collaborative Research: Species Responses to
 Changes in Climate Across Arctic Gradients Using the North America ITEX 
Network (NATEX): Influences On Community and Ecosystem Processes

1999 - 2003: OPP-9996383 -- ITEX / Comparative Responses of Moist and Dry 
Arctic Tundra to Altered Snow and Temperature Regimes


CONDITIONS FOR USE AND CITATION:

For permission to use these data, contact the Principal Investigator.  Grant    
numbers must be cited in any manuscripts resulting from these data.  In 
addition, a copy of the manuscript must be sent to the PI.


DATA SET OVERVIEW:

This file contains Eriophorum vaginatum pedicel length data collected for the 
Toolik Snowfence Experiment from 1995 to 2001 at the moist tussock site. The 
Toolik Snowfence Experiment (part of the International Tundra Experiment network) 
examines the short- and long-term effects of increased snow depth (shortened 
growing season) and increased summer temperature on arctic tundra vegetation.  
The goal of this project is to assess potential changes in tundra plant 
communities in response to global climate change.

Time period covered by data: 19950000 to 20010721
Physical location of measurement: Toolik Field Station, Alaska USA 
(68.62710 N, 149.59322 W)


DATA COLLECTION AND PROCESSING:

In each plot, we measured the length of every Eriophorum vaginatum pedicel.  Data 
were collected approximately every 10 days over the growing season in 1997, 1998 
and 2000.  In 1995 and 2001, data were collected only at peak season.  Only pedicel 
number per plot was recorded in 1999.  These data were not collected in 1996.

The Toolik Snowfence Experiment's design and manipulation are described further in: 

Walker, M. D., D. A. Walker, J. M. Welker, A. M. Arft, T. Bardsley, P. D. Brooks, 
J. T. Fahnestock, M. H. Jones, M. Losleben, A. N. Parsons, T. R. Seastedt and 
P. L. Turner.  1999.  Long-term experimental manipulation of winter snow regime 
and summer temperature in arctic and alpine tundra.  Hydrological Processes  13: 
2315-2330.


DATA FORMAT:

File name: USTOOLIK_ erivagpedicel95-01.txt

SUMMARY OF VARIABLES FOR 1995-2001 DATA

1. SITE: country/site/project title
2. DATE: date of data collection (YYYYMMDD)
3. LOCATION: site; moist
4. ZONE: 0-6
5. TREATMENT: treatment, either OTC (open topped chamber) or CTL (control)
6. PLOT: plot number 
7. NO_INFLORESCENCES/PLOT: tally of the number of inflorescences(=pedicels)/plot 
8. NOTES
9. PEDICEL_LENGTH1,... PEDICEL_LENGTH206: pedicel length measured from the base of 
the tiller to the base of the inflorescence for pedicels 1 through 206 (mm)

DESCRIPTION OF SELECT VARIABLES:

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

LOCATION
Research site: Snowfences are erected and grids established at both a moist tussock 
site (68.62032 N, 149.59931) and a dry heath site (68.62261 N, 149.59589 W).  In 
addition, monitored plots are established where a natural snowdrift occurs.  This 
site is referred to as the snowfield.

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.

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

PEDICEL_LENGTH1,... PEDICEL_LENGTH206
Inflorescences in bud are noted by "B" and those pre-formed for the next growing 
season are noted by "PF."

CODES USED IN DATA SET
In all years "-9999" indicates missing data or empty cells. 


DATA REMARKS:

The date of collection was not noted for 1995 data.


LOCATION OF ORIGINAL DATA SHEETS:

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


DOCUMENTATION AUTHOR:

Original: Amy Breen Carroll, 11 February, 2002
Updated by: Amy Breen Carroll, 18 February, 2002


PRINCIPAL FIELD WORKERS:

Andrew Borner


PRINCIPAL POSTDOCS:

Michael H. Jones
Anna Arft


PUBLICATIONS WHICH INCLUDE THESE DATA:

Arft, A. M., M. D. Walker, J. Gurevitch, J. M. Alatalo, M. S. Bret-Harte, 
M. Dale, M. Diemer, F. Gugerli, G. H. R. Henry, M. H. Jones, R. D. Hollister,
I. S. Jonsdottir, K. Laine, E. Levesque, G. M. Marion, U. Molau, P. Molgaard, 
U. Nordenhall, V. Raszhivin, C. H. Robinson, G. Starr, A. Stenstrom, M. Stenstrom, 
O. Totland, P. L. Turner, L. J. Walker, P. J. Webber, J. M. Welker and 
P. A. Wookey.  1999.  Responses of tundra plants to experimental warming: 
Meta-analysis of the International Tundra Experiment  Ecological Monographs  
69(4): 491-511.