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Conditions of Use

The re-use of scientific data has the potential to greatly increase communication, collaboration and synthesis within and among disciplines, and thus is fostered, supported and encouraged. Permission to use this dataset is granted to the Data User free of charge subject to the following terms:

1) Acceptable use. Use of the dataset will be restricted to academic, research, educational, government, recreational, or other not-for-profit professional purposes. The Data User is permitted to produce and distribute derived works from this dataset provided that they are released under the same license terms as those accompanying this Data Set. Any other uses for the Data Set or its derived products will require explicit permission from the dataset owner.
2 ) Redistribution. The data are provided for use by the Data User. The metadata and this license must accompany all copies made and be available to all users of this Data Set. The Data User will not redistribute the original Data Set beyond this collaboration sphere.
3 ) Citation. It is considered a matter of professional ethics to acknowledge the work of other scientists. Thus, the Data User will properly cite the Data Set in any publications or in the metadata of any derived data products that were produced using the Data Set. Citation should take the following general form: Creator, Year of Data Publication, Title of Dataset, Publisher, Dataset identifier. For example:

Shaver, G. 1989. Above ground biomass in acidic tussock tundra experimental site, 1989, Arctic LTER, Toolik, Alaska. Arctic LTER, Marine Biological Lab, Woods Hole, Ma 02543. 1989gsttbm http://ecosystems.mbl.edu/arc/terrest/biomass/index.shtml 

4 ) Acknowledgement. The Data User should acknowledge any institutional support or specific funding awards referenced in the metadata accompanying this dataset in any publications where the Data Set contributed significantly to its content. Acknowledgements should identify the supporting party, the party that received the support, and any identifying information such as grant numbers. For example:

Data sets were provided by the Arctic LTER. This material is based upon work supported by the National Science Foundation under Grants #DEB-981022, 9211775, 8702328; #OPP-9911278, 9911681, 9732281, 9615411, 9615563, 9615942, 9615949, 9400722, 9415411, 9318529; #BSR 9019055, 8806635, 8507493.

5 ) Notification. The Data User will notify the Data Set Contact when any derivative work or publication based on or derived from the Data Set is distributed. The Data User will provide the data contact with two reprints of any publications resulting from use of the Data Set and will provide copies, or on-line access to, any derived digital products. Notification will include an explanation of how the Data Set was used to produce the derived work.
6 ) Collaboration. The Data Set has been released in the spirit of open scientific collaboration. Data Users are thus strongly encouraged to consider consultation, collaboration and/or co-authorship with the Data Set Creator.

By accepting this Data Set, the Data User agrees to abide by the terms of this agreement. The Data Owner shall have the right to terminate this agreement immediately by written notice upon the Data User's breach of, or non-compliance with, any of its terms. The Data User may be held responsible for any misuse that is caused or encouraged by the Data User's failure to abide by the terms of this agreement.

Disclaimer

While substantial efforts are made to ensure the accuracy of data and documentation contained in this Data Set, complete accuracy of data and metadata cannot be guaranteed. All data and metadata are made available "as is". The Data User holds all parties involved in the production or distribution of the Data Set harmless for damages resulting from its use or interpretation.

Dataset URLs:METADATA: HTML, Rich Text, XML(EML compliant)
DATA: Comma Delimited, Excel file with Metadata and data, Dataset via LTER Data Poral
Dataset ID:1999lgcover.07
Dataset Title:Relative percent cover was measured for plant species on Arctic LTER experimental plots in moist acidic and moist non-acidic tundra, Toolik Field Station, Alaska, Arctic LTER 1999.
Investigator 1: 
First Name:Laura
Last Name:Gough
Organization:Department of Biology
Address line 2:Box 19498
Address line 3:University of Texas at Arlington
City:Arlington
State:Texas
Zip Code:76019
Country:USA
Investigator 2: 
First Name:Gus
Last Name:Shaver
Organization:
Address line 2:
Address line 3:
City:
State:
Zip Code:
Country:
Associate Investigators:
Keywords:plant cover, Alaska, diversity, tundra, relative abundance, disturbance, populations
Abstract:Relative percent cover was measured for plant species on Arctic LTER experimental plots in moist acidic and moist non-acidic tundra, Toolik Field Station, Alaska, Arctic LTER 1999.
For questions about the Metadata and data contact the Investigators.
For information about this web site contact:
Arctic LTER Information Manager
The Ecosystems Center
Marine Biological Lab
7 MBL St
Woods Hole, MA 02543
Phone (508) 289 7496
Email: arc_im@mbl.edu
Online URL: http://ecosystems.mbl.edu/ARC/
DATA FILE INFORMATION:
Data File URL http://metacat.lternet.edu/das/dataAccessServlet?docid=knb-lter-arc.1388&urlTail=terrest/plantinfo/data/1999lgcover.csv
Data File Name 1999lgcover
Beginning Date 7/15/1999
End Date 9/1/1999
Number of Data Records 9621
Other Files to Reference
Availability Status
Quality Control Information
Maintenance Description
Log of Changes: Log of changes:
Version2: Creaded Excel metadata form. Changed title, filename to full year and added attribut table. 10Jan06 JimL
Version 3: Moved location of file so the URL changed. Nov 2007 Jim L
Version 4: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 5: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 6: Updated metadata form to newer version (without site sheet). CH 25Jan2013 Updated to newer metadata with site sheet. CH March 2013.
Version 7: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 17Feb14
 
RESEARCH LOCATION:                  
Location Name LTER Moist Acidic Tussock Tundra LTER Moist NonAcidic Tussock Tundra Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One Select Site or enter New One  
Geographic Description Arctic LTER Experimental Plots: Moist Acidic Tussock Tundra (MAT) Northeast corner block 1 near Toolik Field Station, North Slope, Alaska. Arctic LTER Experimental Plots: Moist NonAcidic Tussock Tundra (MNT) Northeast corner block 1 near Toolik Field Station, North Slope, Alaska. Enter Description Enter Description Enter Description Enter Description Enter Description Enter Description  
Location Bounding Box                  
West Bounding Coordinate                  
East Bounding Coordinate                  
North Bounding Coordinate                  
South Bounding Coordinate                  
OR if single point location                  
Latitude 68.624411 68.634039 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Longitude -149.609589 -149.637049 In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees In Decimal Degrees  
Elevation 750 750 In Meters In Meters In Meters In Meters In Meters In Meters  
Link to Google Map View on Google Map View on Google Map              
                   
 
TAXONOMIC COVERAGE:
Organisms studied Vaccinium vitis-idaea; Vaccinium uliginosum; Tofieldia coccinea; Thalictrum sp.; Stellaria edwardsii; Silene acaulis; Senecio resedifolius; Saxifraga sp; Saxifraga punctata; Saxifraga hirculus; Saxifraga davurica; Saussurea angustifolia; Salix reticulata; Salix pulchra; Salix phlebophylla; Salix glauca; Salix arctica; Rubus chamaemorus; Rhododendron lapponicum; Ranunculus sp; Pyrola secunda; Pyrola grandiflora; Potentilla sp.; Polygonum viviparum; Polygonum bistorta; Poa sp.; Poa arctica; Pedicularis sudetica; Pedicularis sp.; Pedicularis oederi; Pedicularis labradorica; Pedicularis kanei; Pedicularis capitata; Papaver sp. ; Oxytropis sp. ; Nostoc sp. ; Minuartia arctica; Ledum palustre; Lagotis glauca; Geum glaciale; Eriophorum vaginatum; Eriophorum angustifolium ssp. triste; Equisetum arvense; Empetrum nigrum; Dryas integrifolia; Draba sp.; Cassiope tetragona; Carex sp; Carex bigelowii; Cardamine hyperborea; Calamagrostis canadensis; Betula nana; Aster sp.; Arctostaphylos alpina; Andromeda polifolia; Aconitum sp.;
 
Methods:The LTER moist acidic tussock (MAT) site was set up in 1989. The experimental design is four blocks of 5 x 20 meter plots with randomly assigned treatments within each block. Treatments include control (CT), nitrogen added (N), phosphorus added (P), and nitrogen plus phosphorus (NP). Fertilizer is added annually following snowmelt in June as 10 g/m2 nitrogen (as NH4NO3) and 5 g/m2 phosphorous (as triple superphosphate). A passive warming experiment is conducted annually plastic covered greenhouses (GH) and warming amended N plus P as described above (GHNP). Shade houses reduce ambient light penetration to the ground by 50% (SHCT) and are also imposed on plots where N and P are added as above (SHNP). Exclosure plots were set up at the MAT site in July 1996 on extra 5 x 20 meter plots within the four-block design of the 1989 LTER acidic tussock experimental plots. On each plot a 5 x 10 meter section was fenced with large mesh (4-inch square mesh) and within this fence a 5x5-meter plot was fenced with a small mesh (1/2-inch square mesh). In each block two fenced plots were setup: a plot with no fertilizer and a plot with annual fertilization treatments as described above. Thus the treatments created are no fence, no fertilizer (NFCT); small mesh fence, no fertilizer (SFCT); large mesh fence, no fertilizer (LFCT); no fence, N plus P (NFNP); small mesh fence, N plus P (SFNP); and large mesh fence, N plus P (LFNP). In 1997 pH manipulation plots were established by creating one new 5 x 20 m plot adjacent to each of the original four blocks described above. Each plot was divided into two 5 x 10 m sections. Lime (L) is added annually at the rate of 150 g/m2 to raise pH in one half of the plot, and elemental sulfur (S) is added annually at the rate of 50 g/m2 to decrease pH in the other half of the plot.

In 1997 experimental plots were established at the LTER moist non-acidic tussock (MNT) site with the same methods as those used at MAT. CT, N, P, NP, L and S treatments are replicated in three blocks. GHCT and GHNP treatments are replicated in two blocks.

Calculations: All percent cover values were summed within each plot, and then each value was divided by the total to generate a percent cover value standardized to 100%.

Reference Citations: Gough, L. and S.E. Hobbie. 2003. Responses of moist non-acidic arctic tundra to altered environment: productivity, biomass, and species richness. Oikos 103:204-216.

Sampling Description.

Permanent monitoring areas were established in all treatment plots in 1998. Eight 1 m2 plots are sampled in each treatment in each block each year at the end of July. A 1 m2 quadrat is aligned 0.2 m inside of the plot at the site of a flag marking the first measurement. Within this quadrat, aerial percent cover of all vascular plants are noted by species as is all other ground cover. Categories include moss (all species lumped), lichen (all species lumped), litter, and standing dead Betula nana. Tussocks of Eriophorum vaginatum may be recorded as dying, dead, or eaten (indicating consumption by voles). Bare ground, frost boil, and water are also recorded. As an indicator of vole activity, the percent cover of the plot comprised of vole burrow holes, vole trails, and vole litter (small pieces of dead plant material) are also recorded. Finally, tussocks of Eriophorum vaginatum are counted. To standardize cover among plots, all percent cover values were summed within each plot, and then each value was divided by the total to generate a percent cover value standardized to 100%.

Data Table

Variable Name Variable Description Data Type Units DateTime Format Code Information Missing Value Code
Year The year of percent cover measurement text        
Site The site of percent cover measurement text        
Treatment The manipulated treatment text        
Block The treatment block number text        
Plot Sample plot where percent cover was measured text        
Species Species and cover categories determined on plots as described above. text        
Relative Cover The percent cover of a given species relative to the total cover of the plot, or in the case of the category "tussock #", the number of tussocks found in a plot number percent      

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.