A harvest was conducted to determine productivity of rare species not found in at least 4 quadrats per site in a separate small quadrat aboveground biomass harvest (see 97lg3sbm.txt). Harvests occurred in a tussock, watertrack, and snowbed community at 3 sites - acidic tundra near Toolik (site of acidic LTER plots), nonacidic tundra near Toolik Lake(site of non-acidic LTER plots), and acidic tundra near Sagwon. Moss and lichen data are presented by species elsewhere (see 97lgmosslichen).
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A separate harvest was conducted in order to determine productivity of rare species not found in at least 4 quadrats per site in a separate aboveground biomass harvest (see 97lg3sbm.txt). These species were selected based on the species measured for leaf level photosynthesis in summer 1997. A 1 m^2 quadrat divided into 20 x 20 cm areas was used to determine visual percent cover of each of these species within the 9 m2 plots. Subsequently the same quadrat was placed on an area outside the plots (targeted for the species), percent cover was estimated, and all aboveground biomass of the targeted species was harvested. This was done 4 times at each site/community for each species.
Plots were established in homogeneous vegetation in each of the communities at each site. Slope and aspect were as consistent as possible across the site locations. Eight 3 x 3 m plots were established and the corner of focus was chosen randomly. In the lab plant material was separated into lichen, moss, and vascular species. Lichens were separated to genus. In 4 quadrats at each community within each site, mosses were separated by species. In the other 4 mosses were lumped for total biomass only. Vascular species had belowground material removed, and were divided into current year?s growth and old growth. Harvesting and separating were conducted from 25 July through 1 August, 1997. All specimens were dried for at least 48 hours at 60 degrees C and weighed. Samples were then returned to Woods Hole, Mass. for nutrient analysis.
Notes: The 1 square meter plots were not representative of the species area extent since the plot was selected based on the presence of the species.
Calculations: Rare species biomass was estimated from the species? percent cover in a 9 m^2 plot. All of a plant?s above ground biomass was harvested in a 1 square meter plot. The biomass was divided by the percent cover in the square meter plot and then scaled by the percent cover in the 9 square meter plots. The 1 square meter plots were not representative of a species? area extent since the plot was selected based on the presence of the species.
Version 2: Created Excel metadata form. Added title and atrribute table. 10Jan06 JimL
Version 3: Added LTERNET Data Access server proxy for Excel and comma delimited data files.
Version 4: Update LTERNET Data Access server proxy link for Excel and comma delimited data files. Changed from knb to das in url.
Version 5: Updated the metadata form to new version and eml to 2.1.0 JimL 9Jul2012
Version 6: Taxonomic coverage data updated. Updated metadata to newer form (with sites sheet). CH March 2013.
Version 7: Checked keywords against the LTER network preferred list and replaced non-preferred terms. Jim L 27Jan14
Version 8: Changed Distribution URL since the LTER network DAS system is being discontinued. (There is no version 8) JimL 9Apr2015
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