TITLE: Toolik Snowfence Experiment: 1996-2001 Dry site Dryas octopetala quantitative 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 TITLE AND GRANT NUMBERS: Collaborative Research: Species Responses to Changes in Climate Across Arctic Gradients Using the North America ITEX Network (NATEX): Influences On Community and Ecosystem Processes 1994 - 1998: OPP-9400083, OPP-9642517 1999 - 2003: OPP-9996383, OPP-9907127, OPP-0041576, OPP-0120134 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 Dryas octopetala quantitative data collected for the Toolik Snowfence Experiment from 1996 to 2001 at the dry heath 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: 19960618 to 20010719 Physical location of measurement: Toolik Field Station, Alaska USA (68.62710 N, 149.59322 W) DATA COLLECTION AND PROCESSING: In each plot, we measured these traits: number of flowers and fruits, length of the longest six leaves and length of all of the pedicels within the plot. In years 1998-2001, the reproductive stage (bud, flower or fruit) was noted for each pedicel. Data were collected every 10 days over the growing season in 1996-1998 and 2000. In 2001, data were collected only at peak season. In 1999, these data were not collected. 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_dry_dryoct96-01.txt SUMMARY OF VARIABLES FOR 1996-2001 DATA 1. SITE: country/site/project title 2. DATE: date of data collection (YYYYMMDD) 3. LOCATION: site; dry 4. PLOT: plot number 5. ZONE: 0-6 6. TREATMENT: treatment, either OTC (open topped chamber) or CTL (control) 7. NO_FLOWERS: total number of flowers per plot 8. NO_FRUITS: total number of fruits on plant per plot 9. LEAF_LENGTH1... LEAF_LENGTH6: length of the six longest leaves in the plot (mm) 10. PEDICEL_LENGTH1... PEDICEL_LENGTH99: length of pedicels all pedicels in the plot (mm) 11. NOTES 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_LENGTH99 The length of every pedicel is measured within the plot. In years 1998, 2000 and 2001 the reproductive stage is also indicated. The codes for each stage are: B=bud, FL=flower, FR=fruit. If the stage is not indicated the pedicel is either post-reproduction. CODES USED IN DATA SET In all years "-9999" indicates missing data or empty cells. Questionable data is indicated by "****" in the notes column. Aborted flowers or fruits are indicated by "AAA." DATA REMARKS: None to date. LOCATION OF ORIGINAL DATA SHEETS: Boreal Ecology Cooperative Research Unit, University of Alaska, Fairbanks, Alaska, USA DOCUMENTATION AUTHOR: Original: Amy Breen Carroll, 31 January, 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.