Relative percent cover was measured for plant species on Arctic LTER experimental plots in moist acidic, dry heath and moist non-acidic tundra, and for Sagavanirktok River plots in tussock and heath tundra, North Slope Alaska 2004.

Abstract: 

Relative percent cover was measured for plant species on Arctic LTER experimental plots at Toolik field station in moist acidic and moist non acidic tussock tundra, and dry heath tundra, and on Sagavanirktok River toposequence plots in tussock and heath tundra.

Project Keywords: 

Data set ID: 

10012

EML revision ID: 

6
Published on EDI/LTER Data Portal

Citation: 

Gough, L. 2007. Relative percent cover was measured for plant species on Arctic LTER experimental plots in moist acidic, dry heath and moist non-acidic tundra, and for Sagavanirktok River plots in tussock and heath tundra, North Slope Alaska 2004. Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/30f0822d9a7d4e2980300052a67e60b1
People

Owner/Creator: 

Contact: 

Additional People: 

Associated Researcher
Associated Researcher
Associated Researcher
Associated Researcher
Dates

Date Range: 

Friday, July 16, 2004 to Monday, July 26, 2004

Publication Date: 

2007

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 (N), phosphorus (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). 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). Only NFCT, NFNP, SFCT, and SFNP were censused in 2004. The LTER dry heath (DH) site was also established in 1989 using the same methods at MAT in three block replicates. Exclosure plots were set up in 1996 using the same methods at MAT. 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 and NP treatments are replicated in three blocks at MNT.

The Sagavanirktok River site was set up in 1984 and contains six vegetation types along a toposequence on the floodplain terrace. Vegetation types are moist tussock tundra, dry heath tundra, snowbed, equisetum/forb, wet sedge tundra, and riparian shrub. Each vegetation type had control (CT), nitrogen (N), phosphorus (P), and nitrogen plus phosphorus (NP) treatments. Fertilizers are added in the same way as the LTER tundra sites. Percent cover was recorded on tussock tundra and heath tundra types.

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.
Gough, L., P.A. Wookey, and G.R. Shaver. 2002. Dry heath arctic tundra responses to long-term nutrient and light manipulation. Arctic, Antarctic, and Alpine Research. 34: 211-218.
Shaver, G.R., J.A. Laundre, A.E. Giblin, and K.J. Nadelhoffer. 1996. Changes in live plant biomass, primary production and species composition along a riverside toposequence in Arctic Alaska, U.S.A. Arctic and Alpine Research. 28: 363-379.

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. 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. 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%.

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.

Version Changes: 

ver 2 change lat long to decimal
Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 4: Upadte LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Updated metadata form to newer version (without site sheet). Fixed discrepency with header variable names. CH 25Jan2013 Updated to newer metadata with site sheet. CH March 2013.
Version 6: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 17Feb14
Version 7: Changed Distrubution URL since the LTER network DAS system is being discontinued. JimL 9Apr2015

Sites sampled.

Full Metadata and data files (either comma delimited (csv) or Excel) - Environmental Data Initiative repository.

Use of the data requires acceptance of the data use policy --> Arctic LTER Data Use Policy