Arctic LTER 2005: Relative percent cover was measured for plant species on Arctic LTER experimental plots in moist acidic, moist non-acidic and dry heath tundra.

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.

Project Keywords: 

Data set ID: 

10013

EML revision ID: 

6
Published on EDI/LTER Data Portal

Citation Suggestion: 

Gough, L. 2007. Arctic LTER 2005: Relative percent cover was measured for plant species on Arctic LTER experimental plots in moist acidic, moist non-acidic and dry heath tundra. Environmental Data Initiative. http://dx.doi.org/10.6073/pasta/c7344c7f8af925285bfb25632c545649
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Dates

Date Range: 

Friday, July 15, 2005 to Friday, July 29, 2005

Publication Date: 

Wednesday, December 12, 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 CT, NP, NFCT, NFNP, SFCT, and SFNP were censused in 2005.

The LTER dry heath (DH) site was also established in 1989 using the same methods at MAT in three block replicates. Exclosure plots, replicated twice, were also established outside of the blocks in 1989. They included large mesh fence, no fertilizer (LFCT17), medium mesh fence, no fertilizer (MFCT17), and small mesh fence, no fertilizer (SFCT17). Exclosure plots were set up within the blocks in 1996 using the same methods at MAT. NFCT, NFNP, LFCT, LFNP, SFCT, SFNP, LFCT17, MFCT17, and SFCT17 were censused in 2005.

In 1997 experimental plots were established in three block at the LTER moist non-acidic tussock (MNT) site with the same methods as those used at MAT. CT, N, P and NP treatments were censused in 2005.

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.

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.

Sites sampled.

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